Clean up, remove compat with py < 3.6

[pyi2ncommon] / src / type_helpers.py

diff --git a/src/type_helpers.py b/src/type_helpers.py
index eb74968..5a26725 100644 (file)
--- a/src/type_helpers.py
+++ b/src/type_helpers.py
@@ -19,49 +19,35 @@
 # Copyright (c) 2016-2018 Intra2net AG <info@intra2net.com>
 
 """
-Helpers for type checking and conversion, like isstr(x), is_file_obj(x)
+Helpers for type checking and conversion, like `isstr(x)`, `is_file_obj(x)`
+
+Some of these things used to be more complicated when python2 was still
+around, so some functions are not that useful anymore.
 """
 
-import sys
 from io import IOBase
 
 
 def isstr(var):
-    """ determines if the given var is a (regular/unicode/raw) string or not
-
-    in python2, u'a' is not a subclass of str, so to get a True as result, you
-      have to test for basestring as superclass.
-
-    In python3 that is no longer the case
-
-    @returns True if the input is a regular string, a unicode or a raw string,
-       False for everything else (including byte literals like b'abc')
-
-    For more complex py2/py3 compatibility issues, consider using six
-      (https://pythonhosted.org/six)
-    """
-
+    """Alias for `isinstance(var, str)`."""
     return isinstance(var, str)
 
 
 def is_str_or_byte(var):
-    """ returns true for str, unicode and byte objects """
+    """Returns `True` for `str` and `bytes` objects."""
     return isinstance(var, (str, bytes))
 
 
 def is_unicode(var):
-    """ returns true for unicode strings
-
-    py2: return True for type unicode but not type str
-    py3: return True for type str but not type bytes
-    """
+    """Alias for `isinstance(var, str)`."""
     return isinstance(var, str)
 
 
 def is_file_obj(var):
-    """ determines whether given input is the result of 'open(file_name)'
+    """
+    Determine whether given input is the result of 'open(file_name)'.
 
-    just checks whether given var is subclass of io.IOBase, which is also True
-    for 'file-like objects' like StringIO
+    Just checks whether given var is subclass of io.IOBase, which is also True
+    for 'file-like objects' like StringIO.
     """
     return isinstance(var, IOBase)