Remove some code specific to Python 2

`to_env` and `to_text` are no longer necessary since they were identity
functions with Python 3.

src/dotenv/cli.py

@@ -9,7 +9,7 @@
                      'Run pip install "python-dotenv[cli]" to fix this.')
     sys.exit(1)
 
-from .compat import IS_TYPE_CHECKING, to_env
+from .compat import IS_TYPE_CHECKING
 from .main import dotenv_values, get_key, set_key, unset_key
 from .version import __version__
 
@@ -123,9 +123,9 @@ def run(ctx, override, commandline):
             ctx=ctx
         )
     dotenv_as_dict = {
-        to_env(k): to_env(v)
+        k: v
         for (k, v) in dotenv_values(file).items()
-        if v is not None and (override or to_env(k) not in os.environ)
+        if v is not None and (override or k not in os.environ)
     }
 
     if not commandline:

src/dotenv/compat.py

@@ -1,13 +1,3 @@
-import sys
-
-PY2 = sys.version_info[0] == 2  # type: bool
-
-if PY2:
-    from StringIO import StringIO  # noqa
-else:
-    from io import StringIO  # noqa
-
-
 def is_type_checking():
     # type: () -> bool
     try:
@@ -18,32 +8,3 @@ def is_type_checking():
 
 
 IS_TYPE_CHECKING = is_type_checking()
-
-
-if IS_TYPE_CHECKING:
-    from typing import Text
-
-
-def to_env(text):
-    # type: (Text) -> str
-    """
-    Encode a string the same way whether it comes from the environment or a `.env` file.
-    """
-    if PY2:
-        return text.encode(sys.getfilesystemencoding() or "utf-8")
-    else:
-        return text
-
-
-def to_text(string):
-    # type: (str) -> Text
-    """
-    Make a string Unicode if it isn't already.
-
-    This is useful for defining raw unicode strings because `ur"foo"` isn't valid in
-    Python 3.
-    """
-    if PY2:
-        return string.decode("utf-8")
-    else:
-        return string

src/dotenv/main.py

@@ -10,7 +10,7 @@
 from collections import OrderedDict
 from contextlib import contextmanager
 
-from .compat import IS_TYPE_CHECKING, PY2, StringIO, to_env
+from .compat import IS_TYPE_CHECKING
 from .parser import Binding, parse_stream
 from .variables import parse_variables
 
@@ -24,11 +24,6 @@
     else:
         _PathLike = Text
 
-    if sys.version_info >= (3, 0):
-        _StringIO = StringIO
-    else:
-        _StringIO = StringIO[Text]
-
 
 def with_warn_for_invalid_lines(mappings):
     # type: (Iterator[Binding]) -> Iterator[Binding]
@@ -44,8 +39,8 @@ def with_warn_for_invalid_lines(mappings):
 class DotEnv():
 
     def __init__(self, dotenv_path, verbose=False, encoding=None, interpolate=True, override=True):
-        # type: (Union[Text, _PathLike, _StringIO], bool, Union[None, Text], bool, bool) -> None
-        self.dotenv_path = dotenv_path  # type: Union[Text,_PathLike, _StringIO]
+        # type: (Union[Text, _PathLike, io.StringIO], bool, Union[None, Text], bool, bool) -> None
+        self.dotenv_path = dotenv_path  # type: Union[Text,_PathLike, io.StringIO]
         self._dict = None  # type: Optional[Dict[Text, Optional[Text]]]
         self.verbose = verbose  # type: bool
         self.encoding = encoding  # type: Union[None, Text]
@@ -55,15 +50,15 @@ def __init__(self, dotenv_path, verbose=False, encoding=None, interpolate=True,
     @contextmanager
     def _get_stream(self):
         # type: () -> Iterator[IO[Text]]
-        if isinstance(self.dotenv_path, StringIO):
+        if isinstance(self.dotenv_path, io.StringIO):
             yield self.dotenv_path
         elif os.path.isfile(self.dotenv_path):
             with io.open(self.dotenv_path, encoding=self.encoding) as stream:
                 yield stream
         else:
             if self.verbose:
                 logger.info("Python-dotenv could not find configuration file %s.", self.dotenv_path or '.env')
-            yield StringIO('')
+            yield io.StringIO('')
 
     def dict(self):
         # type: () -> Dict[Text, Optional[Text]]
@@ -96,7 +91,7 @@ def set_as_environment_variables(self):
             if k in os.environ and not self.override:
                 continue
             if v is not None:
-                os.environ[to_env(k)] = to_env(v)
+                os.environ[k] = v
 
         return True
 
@@ -271,13 +266,7 @@ def _is_interactive():
     else:
         # will work for .py files
         frame = sys._getframe()
-        # find first frame that is outside of this file
-        if PY2 and not __file__.endswith('.py'):
-            # in Python2 __file__ extension could be .pyc or .pyo (this doesn't account
-            # for edge case of Python compiled for non-standard extension)
-            current_file = __file__.rsplit('.', 1)[0] + '.py'
-        else:
-            current_file = __file__
+        current_file = __file__
 
         while frame.f_code.co_filename == current_file:
             assert frame.f_back is not None
@@ -304,7 +293,7 @@ def load_dotenv(
     interpolate=True,
     encoding="utf-8",
 ):
-    # type: (Union[Text, _PathLike, None], Optional[_StringIO], bool, bool, bool, Optional[Text]) -> bool  # noqa
+    # type: (Union[Text, _PathLike, None], Optional[io.StringIO], bool, bool, bool, Optional[Text]) -> bool  # noqa
     """Parse a .env file and then load all the variables found as environment variables.
 
     - *dotenv_path*: absolute or relative path to .env file.
@@ -335,7 +324,7 @@ def dotenv_values(
     interpolate=True,
     encoding="utf-8",
 ):
-    # type: (Union[Text, _PathLike, None], Optional[_StringIO], bool, bool, Optional[Text]) -> Dict[Text, Optional[Text]]  # noqa: E501
+    # type: (Union[Text, _PathLike, None], Optional[io.StringIO], bool, bool, Optional[Text]) -> Dict[Text, Optional[Text]]  # noqa: E501
     """
     Parse a .env file and return its content as a dict.
 

src/dotenv/parser.py

@@ -1,7 +1,7 @@
 import codecs
 import re
 
-from .compat import IS_TYPE_CHECKING, to_text
+from .compat import IS_TYPE_CHECKING
 
 if IS_TYPE_CHECKING:
     from typing import (  # noqa:F401
@@ -12,7 +12,7 @@
 
 def make_regex(string, extra_flags=0):
     # type: (str, int) -> Pattern[Text]
-    return re.compile(to_text(string), re.UNICODE | extra_flags)
+    return re.compile(string, re.UNICODE | extra_flags)
 
 
 _newline = make_regex(r"(\r\n|\n|\r)")

tests/test_main.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
+import io
 import logging
 import os
 import sys
@@ -11,7 +12,6 @@
 import sh
 
 import dotenv
-from dotenv.compat import PY2, StringIO
 
 
 def test_set_key_no_file(tmp_path):
@@ -281,15 +281,12 @@ def test_load_dotenv_redefine_var_used_in_file_with_override(dotenv_file):
 
 @mock.patch.dict(os.environ, {}, clear=True)
 def test_load_dotenv_utf_8():
-    stream = StringIO("a=à")
+    stream = io.StringIO("a=à")
 
     result = dotenv.load_dotenv(stream=stream)
 
     assert result is True
-    if PY2:
-        assert os.environ == {"a": "à".encode(sys.getfilesystemencoding())}
-    else:
-        assert os.environ == {"a": "à"}
+    assert os.environ == {"a": "à"}
 
 
 def test_load_dotenv_in_current_dir(tmp_path):
@@ -361,7 +358,7 @@ def test_dotenv_values_file(dotenv_file):
 )
 def test_dotenv_values_stream(env, string, interpolate, expected):
     with mock.patch.dict(os.environ, env, clear=True):
-        stream = StringIO(string)
+        stream = io.StringIO(string)
         stream.seek(0)
 
         result = dotenv.dotenv_values(stream=stream, interpolate=interpolate)

tests/test_parser.py

@@ -1,7 +1,8 @@
 # -*- coding: utf-8 -*-
+import io
+
 import pytest
 
-from dotenv.compat import StringIO
 from dotenv.parser import Binding, Original, parse_stream
 
 
@@ -166,6 +167,6 @@
     ),
 ])
 def test_parse_stream(test_input, expected):
-    result = parse_stream(StringIO(test_input))
+    result = parse_stream(io.StringIO(test_input))
 
     assert list(result) == expected