Deal with Python 2 compatibility for pathlib

clize/parser.py

@@ -8,7 +8,6 @@
 
 import itertools
 from functools import partial, wraps
-import pathlib
 import warnings
 
 import six
@@ -17,6 +16,14 @@
 
 from clize import errors, util
 
+try:
+    import pathlib
+except ImportError:
+    try:
+        import pathlib2 as pathlib
+    except ImportError:
+        pathlib = False
+
 
 class ParameterFlag(object):
     def __init__(self, name, prefix='clize.Parameter'):
@@ -225,20 +232,21 @@ def is_true(arg):
     return arg.lower() not in ('', '0', 'n', 'no', 'f', 'false')
 
 
-@value_converter(name='PATH')
-def path_converter(arg):
-    return pathlib.Path(arg)
-
-
 _implicit_converters = {
     int: int,
     float: float,
     bool: is_true,
     six.text_type: identity,
     six.binary_type: identity,
-    pathlib.PurePath: path_converter,
 }
 
+if pathlib:
+    @value_converter(name='PATH')
+    def path_converter(arg):
+        return pathlib.Path(arg)
+
+    _implicit_converters[pathlib.PurePath] = path_converter
+
 
 def get_value_converter(annotation):
     try:

clize/tests/test_parser.py

@@ -2,20 +2,27 @@
 # Copyright (C) 2011-2016 by Yann Kaiser and contributors. See AUTHORS and
 # COPYING for details.
 
-import pathlib
 from sigtools import support, modifiers, specifiers
 
 from clize import parser, errors, util
 from clize.tests.util import Fixtures
 
+try:
+    import pathlib
+    pathlib_name = "pathlib"
+except ImportError:
+    import pathlib2 as pathlib
+    pathlib_name = "pathlib2 as pathlib"
+
 
 _ic = parser._implicit_converters
 
 
 class FromSigTests(Fixtures):
     def _test(self, sig_str, typ, str_rep, attrs):
-        sig = support.s(sig_str, pre='import pathlib;'
-                                     'from clize import Parameter')
+        pre_code = ("import {}; from clize import"
+                    " Parameter".format(pathlib_name))
+        sig = support.s(sig_str, pre=pre_code)
         return self._do_test(sig, typ, str_rep, attrs)
 
     def _do_test(self, sig, typ, str_rep, attrs):

tox.ini

@@ -13,6 +13,7 @@ usedevelop=True
 deps=
     unittest2
     repeated_test
+    pathlib2
     python-dateutil
     Pygments
     docs: sphinx