[util] Move compatibility functions out of util

utils is large enough without these compatibility functions.

Everything that is present in newer versions of Python (i.e. with dev Python it's just an import) goes into compat.py .
Everything else (i.e. youtube-dl-specific helpers) goes into utils.py .

22 files changed, 382 insertions, 313 deletions

diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index f7c996c84..8732f3db4 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -22,13 +22,15 @@ import traceback
 if os.name == 'nt':
     import ctypes
 
-from .utils import (
+from .compat import (
     compat_cookiejar,
     compat_expanduser,
     compat_http_client,
     compat_str,
     compat_urllib_error,
     compat_urllib_request,
+)
+from .utils import (
     escape_url,
     ContentTooShortError,
     date_from_str,
diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index 3c968082c..685dd8e5e 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -13,10 +13,12 @@ import sys
 from .options import (
     parseOpts,
 )
-from .utils import (
+from .compat import (
     compat_expanduser,
     compat_getpass,
     compat_print,
+)
+from .utils import (
     DateRange,
     DEFAULT_OUTTMPL,
     decodeOption,
diff --git a/youtube_dl/cache.py b/youtube_dl/cache.py
index ac5925d32..2d9b426cb 100644
--- a/youtube_dl/cache.py
+++ b/youtube_dl/cache.py
@@ -8,10 +8,8 @@ import re
 import shutil
 import traceback
 
-from .utils import (
-    compat_expanduser,
-    write_json_file,
-)
+from .compat import compat_expanduser
+from .utils import write_json_file
 
 
 class Cache(object):
diff --git a/youtube_dl/compat.py b/youtube_dl/compat.py
new file mode 100644
index 000000000..08e8d64d7
--- /dev/null
+++ b/youtube_dl/compat.py
@@ -0,0 +1,314 @@
+import getpass
+import os
+import subprocess
+import sys
+
+
+try:
+    import urllib.request as compat_urllib_request
+except ImportError: # Python 2
+    import urllib2 as compat_urllib_request
+
+try:
+    import urllib.error as compat_urllib_error
+except ImportError: # Python 2
+    import urllib2 as compat_urllib_error
+
+try:
+    import urllib.parse as compat_urllib_parse
+except ImportError: # Python 2
+    import urllib as compat_urllib_parse
+
+try:
+    from urllib.parse import urlparse as compat_urllib_parse_urlparse
+except ImportError: # Python 2
+    from urlparse import urlparse as compat_urllib_parse_urlparse
+
+try:
+    import urllib.parse as compat_urlparse
+except ImportError: # Python 2
+    import urlparse as compat_urlparse
+
+try:
+    import http.cookiejar as compat_cookiejar
+except ImportError: # Python 2
+    import cookielib as compat_cookiejar
+
+try:
+    import html.entities as compat_html_entities
+except ImportError: # Python 2
+    import htmlentitydefs as compat_html_entities
+
+try:
+    import html.parser as compat_html_parser
+except ImportError: # Python 2
+    import HTMLParser as compat_html_parser
+
+try:
+    import http.client as compat_http_client
+except ImportError: # Python 2
+    import httplib as compat_http_client
+
+try:
+    from urllib.error import HTTPError as compat_HTTPError
+except ImportError:  # Python 2
+    from urllib2 import HTTPError as compat_HTTPError
+
+try:
+    from urllib.request import urlretrieve as compat_urlretrieve
+except ImportError:  # Python 2
+    from urllib import urlretrieve as compat_urlretrieve
+
+
+try:
+    from subprocess import DEVNULL
+    compat_subprocess_get_DEVNULL = lambda: DEVNULL
+except ImportError:
+    compat_subprocess_get_DEVNULL = lambda: open(os.path.devnull, 'w')
+
+try:
+    from urllib.parse import unquote as compat_urllib_parse_unquote
+except ImportError:
+    def compat_urllib_parse_unquote(string, encoding='utf-8', errors='replace'):
+        if string == '':
+            return string
+        res = string.split('%')
+        if len(res) == 1:
+            return string
+        if encoding is None:
+            encoding = 'utf-8'
+        if errors is None:
+            errors = 'replace'
+        # pct_sequence: contiguous sequence of percent-encoded bytes, decoded
+        pct_sequence = b''
+        string = res[0]
+        for item in res[1:]:
+            try:
+                if not item:
+                    raise ValueError
+                pct_sequence += item[:2].decode('hex')
+                rest = item[2:]
+                if not rest:
+                    # This segment was just a single percent-encoded character.
+                    # May be part of a sequence of code units, so delay decoding.
+                    # (Stored in pct_sequence).
+                    continue
+            except ValueError:
+                rest = '%' + item
+            # Encountered non-percent-encoded characters. Flush the current
+            # pct_sequence.
+            string += pct_sequence.decode(encoding, errors) + rest
+            pct_sequence = b''
+        if pct_sequence:
+            # Flush the final pct_sequence
+            string += pct_sequence.decode(encoding, errors)
+        return string
+
+
+try:
+    from urllib.parse import parse_qs as compat_parse_qs
+except ImportError: # Python 2
+    # HACK: The following is the correct parse_qs implementation from cpython 3's stdlib.
+    # Python 2's version is apparently totally broken
+
+    def _parse_qsl(qs, keep_blank_values=False, strict_parsing=False,
+                encoding='utf-8', errors='replace'):
+        qs, _coerce_result = qs, unicode
+        pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]
+        r = []
+        for name_value in pairs:
+            if not name_value and not strict_parsing:
+                continue
+            nv = name_value.split('=', 1)
+            if len(nv) != 2:
+                if strict_parsing:
+                    raise ValueError("bad query field: %r" % (name_value,))
+                # Handle case of a control-name with no equal sign
+                if keep_blank_values:
+                    nv.append('')
+                else:
+                    continue
+            if len(nv[1]) or keep_blank_values:
+                name = nv[0].replace('+', ' ')
+                name = compat_urllib_parse_unquote(
+                    name, encoding=encoding, errors=errors)
+                name = _coerce_result(name)
+                value = nv[1].replace('+', ' ')
+                value = compat_urllib_parse_unquote(
+                    value, encoding=encoding, errors=errors)
+                value = _coerce_result(value)
+                r.append((name, value))
+        return r
+
+    def compat_parse_qs(qs, keep_blank_values=False, strict_parsing=False,
+                encoding='utf-8', errors='replace'):
+        parsed_result = {}
+        pairs = _parse_qsl(qs, keep_blank_values, strict_parsing,
+                        encoding=encoding, errors=errors)
+        for name, value in pairs:
+            if name in parsed_result:
+                parsed_result[name].append(value)
+            else:
+                parsed_result[name] = [value]
+        return parsed_result
+
+try:
+    compat_str = unicode # Python 2
+except NameError:
+    compat_str = str
+
+try:
+    compat_chr = unichr # Python 2
+except NameError:
+    compat_chr = chr
+
+try:
+    from xml.etree.ElementTree import ParseError as compat_xml_parse_error
+except ImportError:  # Python 2.6
+    from xml.parsers.expat import ExpatError as compat_xml_parse_error
+
+try:
+    from shlex import quote as shlex_quote
+except ImportError:  # Python < 3.3
+    def shlex_quote(s):
+        return "'" + s.replace("'", "'\"'\"'") + "'"
+
+
+def compat_ord(c):
+    if type(c) is int: return c
+    else: return ord(c)
+
+
+if sys.version_info >= (3, 0):
+    compat_getenv = os.getenv
+    compat_expanduser = os.path.expanduser
+else:
+    # Environment variables should be decoded with filesystem encoding.
+    # Otherwise it will fail if any non-ASCII characters present (see #3854 #3217 #2918)
+
+    def compat_getenv(key, default=None):
+        from .utils import get_filesystem_encoding
+        env = os.getenv(key, default)
+        if env:
+            env = env.decode(get_filesystem_encoding())
+        return env
+
+    # HACK: The default implementations of os.path.expanduser from cpython do not decode
+    # environment variables with filesystem encoding. We will work around this by
+    # providing adjusted implementations.
+    # The following are os.path.expanduser implementations from cpython 2.7.8 stdlib
+    # for different platforms with correct environment variables decoding.
+
+    if os.name == 'posix':
+        def compat_expanduser(path):
+            """Expand ~ and ~user constructions.  If user or $HOME is unknown,
+            do nothing."""
+            if not path.startswith('~'):
+                return path
+            i = path.find('/', 1)
+            if i < 0:
+                i = len(path)
+            if i == 1:
+                if 'HOME' not in os.environ:
+                    import pwd
+                    userhome = pwd.getpwuid(os.getuid()).pw_dir
+                else:
+                    userhome = compat_getenv('HOME')
+            else:
+                import pwd
+                try:
+                    pwent = pwd.getpwnam(path[1:i])
+                except KeyError:
+                    return path
+                userhome = pwent.pw_dir
+            userhome = userhome.rstrip('/')
+            return (userhome + path[i:]) or '/'
+    elif os.name == 'nt' or os.name == 'ce':
+        def compat_expanduser(path):
+            """Expand ~ and ~user constructs.
+
+            If user or $HOME is unknown, do nothing."""
+            if path[:1] != '~':
+                return path
+            i, n = 1, len(path)
+            while i < n and path[i] not in '/\\':
+                i = i + 1
+
+            if 'HOME' in os.environ:
+                userhome = compat_getenv('HOME')
+            elif 'USERPROFILE' in os.environ:
+                userhome = compat_getenv('USERPROFILE')
+            elif not 'HOMEPATH' in os.environ:
+                return path
+            else:
+                try:
+                    drive = compat_getenv('HOMEDRIVE')
+                except KeyError:
+                    drive = ''
+                userhome = os.path.join(drive, compat_getenv('HOMEPATH'))
+
+            if i != 1: #~user
+                userhome = os.path.join(os.path.dirname(userhome), path[1:i])
+
+            return userhome + path[i:]
+    else:
+        compat_expanduser = os.path.expanduser
+
+
+if sys.version_info < (3, 0):
+    def compat_print(s):
+        from .utils import preferredencoding
+        print(s.encode(preferredencoding(), 'xmlcharrefreplace'))
+else:
+    def compat_print(s):
+        assert type(s) == type(u'')
+        print(s)
+
+
+try:
+    subprocess_check_output = subprocess.check_output
+except AttributeError:
+    def subprocess_check_output(*args, **kwargs):
+        assert 'input' not in kwargs
+        p = subprocess.Popen(*args, stdout=subprocess.PIPE, **kwargs)
+        output, _ = p.communicate()
+        ret = p.poll()
+        if ret:
+            raise subprocess.CalledProcessError(ret, p.args, output=output)
+        return output
+
+if sys.version_info < (3, 0) and sys.platform == 'win32':
+    def compat_getpass(prompt, *args, **kwargs):
+        if isinstance(prompt, compat_str):
+            prompt = prompt.encode(preferredencoding())
+        return getpass.getpass(prompt, *args, **kwargs)
+else:
+    compat_getpass = getpass.getpass
+
+
+__all__ = [
+    'compat_HTTPError',
+    'compat_chr',
+    'compat_cookiejar',
+    'compat_expanduser',
+    'compat_getenv',
+    'compat_getpass',
+    'compat_html_entities',
+    'compat_html_parser',
+    'compat_http_client',
+    'compat_ord',
+    'compat_parse_qs',
+    'compat_print',
+    'compat_str',
+    'compat_subprocess_get_DEVNULL',
+    'compat_urllib_error',
+    'compat_urllib_parse',
+    'compat_urllib_parse_unquote',
+    'compat_urllib_parse_urlparse',
+    'compat_urllib_request',
+    'compat_urlparse',
+    'compat_urlretrieve',
+    'compat_xml_parse_error',
+    'shlex_quote',
+    'subprocess_check_output',
+]
diff --git a/youtube_dl/extractor/addanime.py b/youtube_dl/extractor/addanime.py
index fcf296057..11f149f9e 100644
--- a/youtube_dl/extractor/addanime.py
+++ b/youtube_dl/extractor/addanime.py
@@ -3,12 +3,13 @@ from __future__ import unicode_literals
 import re
 
 from .common import InfoExtractor
-from ..utils import (
+from ..compat import (
     compat_HTTPError,
     compat_str,
     compat_urllib_parse,
     compat_urllib_parse_urlparse,
-
+)
+from ..utils import (
     ExtractorError,
 )
 
diff --git a/youtube_dl/extractor/cloudy.py b/youtube_dl/extractor/cloudy.py
index 386f080d2..abf8cc280 100644
--- a/youtube_dl/extractor/cloudy.py
+++ b/youtube_dl/extractor/cloudy.py
@@ -4,14 +4,16 @@ from __future__ import unicode_literals
 import re
 
 from .common import InfoExtractor
-from ..utils import (
-    ExtractorError,
+from ..compat import (
     compat_parse_qs,
     compat_urllib_parse,
-    remove_end,
-    HEADRequest,
     compat_HTTPError,
 )
+from ..utils import (
+    ExtractorError,
+    HEADRequest,
+    remove_end,
+)
 
 
 class CloudyIE(InfoExtractor):
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 7e4113213..9e1d62c2b 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -12,13 +12,14 @@ import sys
 import time
 import xml.etree.ElementTree
 
-from ..utils import (
+from ..compat import (
     compat_http_client,
     compat_urllib_error,
     compat_urllib_parse_urlparse,
     compat_urlparse,
     compat_str,
-
+)
+from ..utils import (
     clean_html,
     compiled_regex_type,
     ExtractorError,
diff --git a/youtube_dl/extractor/crunchyroll.py b/youtube_dl/extractor/crunchyroll.py
index cc612d08e..0bd0eccba 100644
--- a/youtube_dl/extractor/crunchyroll.py
+++ b/youtube_dl/extractor/crunchyroll.py
@@ -17,7 +17,6 @@ from ..utils import (
     bytes_to_intlist,
     intlist_to_bytes,
     unified_strdate,
-    clean_html,
     urlencode_postdata,
 )
 from ..aes import (
diff --git a/youtube_dl/extractor/dropbox.py b/youtube_dl/extractor/dropbox.py
index 5f24ac721..aefca848a 100644
--- a/youtube_dl/extractor/dropbox.py
+++ b/youtube_dl/extractor/dropbox.py
@@ -5,7 +5,8 @@ import os.path
 import re
 
 from .common import InfoExtractor
-from ..utils import compat_urllib_parse_unquote, url_basename
+from ..compat import compat_urllib_parse_unquote
+from ..utils import url_basename
 
 
 class DropboxIE(InfoExtractor):
diff --git a/youtube_dl/extractor/facebook.py b/youtube_dl/extractor/facebook.py
index 3ad993751..104803563 100644
--- a/youtube_dl/extractor/facebook.py
+++ b/youtube_dl/extractor/facebook.py
@@ -5,12 +5,14 @@ import re
 import socket
 
 from .common import InfoExtractor
-from ..utils import (
+from ..compat import (
     compat_http_client,
     compat_str,
     compat_urllib_error,
     compat_urllib_parse,
     compat_urllib_request,
+)
+from ..utils import (
     urlencode_postdata,
     ExtractorError,
     limit_length,
diff --git a/youtube_dl/extractor/generic.py b/youtube_dl/extractor/generic.py
index 3882e859c..babd581ea 100644
--- a/youtube_dl/extractor/generic.py
+++ b/youtube_dl/extractor/generic.py
@@ -7,11 +7,12 @@ import re
 
 from .common import InfoExtractor
 from .youtube import YoutubeIE
-from ..utils import (
+from ..compat import (
     compat_urllib_parse,
     compat_urlparse,
     compat_xml_parse_error,
-
+)
+from ..utils import (
     determine_ext,
     ExtractorError,
     float_or_none,
diff --git a/youtube_dl/extractor/globo.py b/youtube_dl/extractor/globo.py
index 77c3ad4fc..66ca37918 100644
--- a/youtube_dl/extractor/globo.py
+++ b/youtube_dl/extractor/globo.py
@@ -5,13 +5,15 @@ import random
 import math
 
 from .common import InfoExtractor
-from ..utils import (
-    ExtractorError,
-    float_or_none,
+from ..compat import (
     compat_str,
     compat_chr,
     compat_ord,
 )
+from ..utils import (
+    ExtractorError,
+    float_or_none,
+)
 
 
 class GloboIE(InfoExtractor):
diff --git a/youtube_dl/extractor/laola1tv.py b/youtube_dl/extractor/laola1tv.py
index 263f68773..102e29f7a 100644
--- a/youtube_dl/extractor/laola1tv.py
+++ b/youtube_dl/extractor/laola1tv.py
@@ -4,6 +4,7 @@ import random
 import re
 
 from .common import InfoExtractor
+from ..utils import ExtractorError
 
 
 class Laola1TvIE(InfoExtractor):
diff --git a/youtube_dl/extractor/myvideo.py b/youtube_dl/extractor/myvideo.py
index ccb5959c4..a89153985 100644
--- a/youtube_dl/extractor/myvideo.py
+++ b/youtube_dl/extractor/myvideo.py
@@ -7,11 +7,12 @@ import re
 import json
 
 from .common import InfoExtractor
-from ..utils import (
+from ..compat import (
     compat_ord,
     compat_urllib_parse,
     compat_urllib_request,
-
+)
+from ..utils import (
     ExtractorError,
 )
 
diff --git a/youtube_dl/extractor/ro220.py b/youtube_dl/extractor/ro220.py
index 0a3a71448..962b524e9 100644
--- a/youtube_dl/extractor/ro220.py
+++ b/youtube_dl/extractor/ro220.py
@@ -1,7 +1,7 @@
 from __future__ import unicode_literals
 
 from .common import InfoExtractor
-from ..utils import compat_urllib_parse_unquote
+from ..compat import compat_urllib_parse_unquote
 
 
 class Ro220IE(InfoExtractor):
diff --git a/youtube_dl/extractor/vimeo.py b/youtube_dl/extractor/vimeo.py
index d9cad0ea5..c744d4f04 100644
--- a/youtube_dl/extractor/vimeo.py
+++ b/youtube_dl/extractor/vimeo.py
@@ -7,11 +7,13 @@ import itertools
 
 from .common import InfoExtractor
 from .subtitles import SubtitlesInfoExtractor
-from ..utils import (
+from ..compat import (
     compat_HTTPError,
     compat_urllib_parse,
     compat_urllib_request,
     compat_urlparse,
+)
+from ..utils import (
     ExtractorError,
     InAdvancePagedList,
     int_or_none,
diff --git a/youtube_dl/options.py b/youtube_dl/options.py
index 98e20d549..997e92ad7 100644
--- a/youtube_dl/options.py
+++ b/youtube_dl/options.py
@@ -5,9 +5,11 @@ import optparse
 import shlex
 import sys
 
-from .utils import (
+from .compat import (
     compat_expanduser,
     compat_getenv,
+)
+from .utils import (
     get_term_width,
     write_string,
 )
diff --git a/youtube_dl/postprocessor/atomicparsley.py b/youtube_dl/postprocessor/atomicparsley.py
index 765b2d9ee..448ccc5f3 100644
--- a/youtube_dl/postprocessor/atomicparsley.py
+++ b/youtube_dl/postprocessor/atomicparsley.py
@@ -6,10 +6,11 @@ import os
 import subprocess
 
 from .common import PostProcessor
-
+from ..compat import (
+    compat_urlretrieve,
+)
 from ..utils import (
     check_executable,
-    compat_urlretrieve,
     encodeFilename,
     PostProcessingError,
     prepend_extension,
diff --git a/youtube_dl/postprocessor/execafterdownload.py b/youtube_dl/postprocessor/execafterdownload.py
index 08419a3d4..baf1b1945 100644
--- a/youtube_dl/postprocessor/execafterdownload.py
+++ b/youtube_dl/postprocessor/execafterdownload.py
@@ -3,10 +3,8 @@ from __future__ import unicode_literals
 import subprocess
 
 from .common import PostProcessor
-from ..utils import (
-    shlex_quote,
-    PostProcessingError,
-)
+from ..compat import shlex_quote
+from ..utils import PostProcessingError
 
 
 class ExecAfterDownloadPP(PostProcessor):
diff --git a/youtube_dl/postprocessor/ffmpeg.py b/youtube_dl/postprocessor/ffmpeg.py
index 338c145fa..f3f2743c0 100644
--- a/youtube_dl/postprocessor/ffmpeg.py
+++ b/youtube_dl/postprocessor/ffmpeg.py
@@ -1,5 +1,4 @@
 import os
-import re
 import subprocess
 import sys
 import time
@@ -7,8 +6,10 @@ import time
 
 from .common import AudioConversionError, PostProcessor
 
-from ..utils import (
+from ..compat import (
     compat_subprocess_get_DEVNULL,
+)
+from ..utils import (
     encodeArgument,
     encodeFilename,
     get_exe_version,
diff --git a/youtube_dl/postprocessor/xattrpp.py b/youtube_dl/postprocessor/xattrpp.py
index f6940940b..b5cae41c8 100644
--- a/youtube_dl/postprocessor/xattrpp.py
+++ b/youtube_dl/postprocessor/xattrpp.py
@@ -3,10 +3,12 @@ import subprocess
 import sys
 
 from .common import PostProcessor
+from ..compat import (
+    subprocess_check_output
+)
 from ..utils import (
     check_executable,
     hyphenate_date,
-    subprocess_check_output
 )
 
 
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index fcfdadeb6..b0255c943 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -29,254 +29,19 @@ import traceback
 import xml.etree.ElementTree
 import zlib
 
-try:
-    import urllib.request as compat_urllib_request
-except ImportError: # Python 2
-    import urllib2 as compat_urllib_request
-
-try:
-    import urllib.error as compat_urllib_error
-except ImportError: # Python 2
-    import urllib2 as compat_urllib_error
-
-try:
-    import urllib.parse as compat_urllib_parse
-except ImportError: # Python 2
-    import urllib as compat_urllib_parse
-
-try:
-    from urllib.parse import urlparse as compat_urllib_parse_urlparse
-except ImportError: # Python 2
-    from urlparse import urlparse as compat_urllib_parse_urlparse
-
-try:
-    import urllib.parse as compat_urlparse
-except ImportError: # Python 2
-    import urlparse as compat_urlparse
-
-try:
-    import http.cookiejar as compat_cookiejar
-except ImportError: # Python 2
-    import cookielib as compat_cookiejar
-
-try:
-    import html.entities as compat_html_entities
-except ImportError: # Python 2
-    import htmlentitydefs as compat_html_entities
-
-try:
-    import html.parser as compat_html_parser
-except ImportError: # Python 2
-    import HTMLParser as compat_html_parser
-
-try:
-    import http.client as compat_http_client
-except ImportError: # Python 2
-    import httplib as compat_http_client
-
-try:
-    from urllib.error import HTTPError as compat_HTTPError
-except ImportError:  # Python 2
-    from urllib2 import HTTPError as compat_HTTPError
-
-try:
-    from urllib.request import urlretrieve as compat_urlretrieve
-except ImportError:  # Python 2
-    from urllib import urlretrieve as compat_urlretrieve
-
-
-try:
-    from subprocess import DEVNULL
-    compat_subprocess_get_DEVNULL = lambda: DEVNULL
-except ImportError:
-    compat_subprocess_get_DEVNULL = lambda: open(os.path.devnull, 'w')
-
-try:
-    from urllib.parse import unquote as compat_urllib_parse_unquote
-except ImportError:
-    def compat_urllib_parse_unquote(string, encoding='utf-8', errors='replace'):
-        if string == '':
-            return string
-        res = string.split('%')
-        if len(res) == 1:
-            return string
-        if encoding is None:
-            encoding = 'utf-8'
-        if errors is None:
-            errors = 'replace'
-        # pct_sequence: contiguous sequence of percent-encoded bytes, decoded
-        pct_sequence = b''
-        string = res[0]
-        for item in res[1:]:
-            try:
-                if not item:
-                    raise ValueError
-                pct_sequence += item[:2].decode('hex')
-                rest = item[2:]
-                if not rest:
-                    # This segment was just a single percent-encoded character.
-                    # May be part of a sequence of code units, so delay decoding.
-                    # (Stored in pct_sequence).
-                    continue
-            except ValueError:
-                rest = '%' + item
-            # Encountered non-percent-encoded characters. Flush the current
-            # pct_sequence.
-            string += pct_sequence.decode(encoding, errors) + rest
-            pct_sequence = b''
-        if pct_sequence:
-            # Flush the final pct_sequence
-            string += pct_sequence.decode(encoding, errors)
-        return string
-
-
-try:
-    from urllib.parse import parse_qs as compat_parse_qs
-except ImportError: # Python 2
-    # HACK: The following is the correct parse_qs implementation from cpython 3's stdlib.
-    # Python 2's version is apparently totally broken
-
-    def _parse_qsl(qs, keep_blank_values=False, strict_parsing=False,
-                encoding='utf-8', errors='replace'):
-        qs, _coerce_result = qs, unicode
-        pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]
-        r = []
-        for name_value in pairs:
-            if not name_value and not strict_parsing:
-                continue
-            nv = name_value.split('=', 1)
-            if len(nv) != 2:
-                if strict_parsing:
-                    raise ValueError("bad query field: %r" % (name_value,))
-                # Handle case of a control-name with no equal sign
-                if keep_blank_values:
-                    nv.append('')
-                else:
-                    continue
-            if len(nv[1]) or keep_blank_values:
-                name = nv[0].replace('+', ' ')
-                name = compat_urllib_parse_unquote(
-                    name, encoding=encoding, errors=errors)
-                name = _coerce_result(name)
-                value = nv[1].replace('+', ' ')
-                value = compat_urllib_parse_unquote(
-                    value, encoding=encoding, errors=errors)
-                value = _coerce_result(value)
-                r.append((name, value))
-        return r
-
-    def compat_parse_qs(qs, keep_blank_values=False, strict_parsing=False,
-                encoding='utf-8', errors='replace'):
-        parsed_result = {}
-        pairs = _parse_qsl(qs, keep_blank_values, strict_parsing,
-                        encoding=encoding, errors=errors)
-        for name, value in pairs:
-            if name in parsed_result:
-                parsed_result[name].append(value)
-            else:
-                parsed_result[name] = [value]
-        return parsed_result
-
-try:
-    compat_str = unicode # Python 2
-except NameError:
-    compat_str = str
-
-try:
-    compat_chr = unichr # Python 2
-except NameError:
-    compat_chr = chr
-
-try:
-    from xml.etree.ElementTree import ParseError as compat_xml_parse_error
-except ImportError:  # Python 2.6
-    from xml.parsers.expat import ExpatError as compat_xml_parse_error
-
-try:
-    from shlex import quote as shlex_quote
-except ImportError:  # Python < 3.3
-    def shlex_quote(s):
-        return "'" + s.replace("'", "'\"'\"'") + "'"
-
-
-def compat_ord(c):
-    if type(c) is int: return c
-    else: return ord(c)
-
-
-if sys.version_info >= (3, 0):
-    compat_getenv = os.getenv
-    compat_expanduser = os.path.expanduser
-else:
-    # Environment variables should be decoded with filesystem encoding.
-    # Otherwise it will fail if any non-ASCII characters present (see #3854 #3217 #2918)
-
-    def compat_getenv(key, default=None):
-        env = os.getenv(key, default)
-        if env:
-            env = env.decode(get_filesystem_encoding())
-        return env
-
-    # HACK: The default implementations of os.path.expanduser from cpython do not decode
-    # environment variables with filesystem encoding. We will work around this by
-    # providing adjusted implementations.
-    # The following are os.path.expanduser implementations from cpython 2.7.8 stdlib
-    # for different platforms with correct environment variables decoding.
-
-    if os.name == 'posix':
-        def compat_expanduser(path):
-            """Expand ~ and ~user constructions.  If user or $HOME is unknown,
-            do nothing."""
-            if not path.startswith('~'):
-                return path
-            i = path.find('/', 1)
-            if i < 0:
-                i = len(path)
-            if i == 1:
-                if 'HOME' not in os.environ:
-                    import pwd
-                    userhome = pwd.getpwuid(os.getuid()).pw_dir
-                else:
-                    userhome = compat_getenv('HOME')
-            else:
-                import pwd
-                try:
-                    pwent = pwd.getpwnam(path[1:i])
-                except KeyError:
-                    return path
-                userhome = pwent.pw_dir
-            userhome = userhome.rstrip('/')
-            return (userhome + path[i:]) or '/'
-    elif os.name == 'nt' or os.name == 'ce':
-        def compat_expanduser(path):
-            """Expand ~ and ~user constructs.
-
-            If user or $HOME is unknown, do nothing."""
-            if path[:1] != '~':
-                return path
-            i, n = 1, len(path)
-            while i < n and path[i] not in '/\\':
-                i = i + 1
-
-            if 'HOME' in os.environ:
-                userhome = compat_getenv('HOME')
-            elif 'USERPROFILE' in os.environ:
-                userhome = compat_getenv('USERPROFILE')
-            elif not 'HOMEPATH' in os.environ:
-                return path
-            else:
-                try:
-                    drive = compat_getenv('HOMEDRIVE')
-                except KeyError:
-                    drive = ''
-                userhome = os.path.join(drive, compat_getenv('HOMEPATH'))
-
-            if i != 1: #~user
-                userhome = os.path.join(os.path.dirname(userhome), path[1:i])
-
-            return userhome + path[i:]
-    else:
-        compat_expanduser = os.path.expanduser
+from .compat import (
+    compat_chr,
+    compat_getenv,
+    compat_html_entities,
+    compat_html_parser,
+    compat_parse_qs,
+    compat_str,
+    compat_urllib_error,
+    compat_urllib_parse,
+    compat_urllib_parse_urlparse,
+    compat_urllib_request,
+    compat_urlparse,
+)
 
 
 # This is not clearly defined otherwise
@@ -304,14 +69,6 @@ def preferredencoding():
 
     return pref
 
-if sys.version_info < (3,0):
-    def compat_print(s):
-        print(s.encode(preferredencoding(), 'xmlcharrefreplace'))
-else:
-    def compat_print(s):
-        assert type(s) == type(u'')
-        print(s)
-
 
 def write_json_file(obj, fn):
     """ Encode obj as JSON and write it to fn, atomically """
@@ -1655,15 +1412,6 @@ def parse_xml(s):
     return tree
 
 
-if sys.version_info < (3, 0) and sys.platform == 'win32':
-    def compat_getpass(prompt, *args, **kwargs):
-        if isinstance(prompt, compat_str):
-            prompt = prompt.encode(preferredencoding())
-        return getpass.getpass(prompt, *args, **kwargs)
-else:
-    compat_getpass = getpass.getpass
-
-
 US_RATINGS = {
     'G': 0,
     'PG': 10,
@@ -1721,18 +1469,6 @@ def qualities(quality_ids):
 
 DEFAULT_OUTTMPL = '%(title)s-%(id)s.%(ext)s'
 
-try:
-    subprocess_check_output = subprocess.check_output
-except AttributeError:
-    def subprocess_check_output(*args, **kwargs):
-        assert 'input' not in kwargs
-        p = subprocess.Popen(*args, stdout=subprocess.PIPE, **kwargs)
-        output, _ = p.communicate()
-        ret = p.poll()
-        if ret:
-            raise subprocess.CalledProcessError(ret, p.args, output=output)
-        return output
-
 
 def limit_length(s, length):
     """ Add ellipses to overly long strings """