Remove the --force2to3 option from setup.py.

See this link for the underlying reason:

  https://bitbucket.org/tarek/distribute/issue/292/allow-use_2to3-with-python-2

HISTORY.md

@@ -9,7 +9,6 @@ History
 -   Added a `parse()` function that yields a printable, pre-compiled
     parse tree.
 -   Added support for rendering pre-compiled templates.
--   Added --force2to3 option to setup.py (issue \#121).
 -   Added support for [PyPy](http://pypy.org/) (issue \#125).
 -   Added support for [Travis CI](http://travis-ci.org) (issue \#124). [msabramo]
 -   Bugfix: exceptions raised from a property are no longer swallowed

README.md

@@ -222,11 +222,10 @@ To convert the code to Python 3 manually (while using Python 3)--
 
     python setup.py build
 
-And while using Python 2--
-
-    python setup.py --force2to3 build
-
-Both of the above write the converted code to a subdirectory called `build`.
+This writes the converted code to a subdirectory called `build`.
+By design, Python 3 builds
+[cannot](https://bitbucket.org/tarek/distribute/issue/292/allow-use_2to3-with-python-2)
+be created from Python 2.
 
 To convert the code without using setup.py, you can use
 [2to3](http://docs.python.org/library/2to3.html) as follows (two steps)--

setup.py

@@ -73,8 +73,6 @@ import shutil
 import sys
 
 
-OPTION_FORCE_2TO3 = '--force2to3'
-
 py_version = sys.version_info
 
 # distutils does not seem to support the following setup() arguments.
@@ -280,19 +278,6 @@ PACKAGES = [
 ]
 
 
-def parse_args(sys_argv):
-    """
-    Modify sys_argv in place and return whether to force use of 2to3.
-
-    """
-    should_force2to3 = False
-    if len(sys_argv) > 1 and sys_argv[1] == OPTION_FORCE_2TO3:
-        sys_argv.pop(1)
-        should_force2to3 = True
-
-    return should_force2to3
-
-
 # The purpose of this function is to follow the guidance suggested here:
 #
 #   http://packages.python.org/distribute/python3.html#note-on-compatibility-with-setuptools
@@ -300,13 +285,16 @@ def parse_args(sys_argv):
 # The guidance is for better compatibility when using setuptools (e.g. with
 # earlier versions of Python 2) instead of Distribute, because of new
 # keyword arguments to setup() that setuptools may not recognize.
-def get_extra_args(should_force2to3):
+def get_extra_args():
     """
     Return a dictionary of extra args to pass to setup().
 
     """
     extra = {}
-    if py_version >= (3, ) or should_force2to3:
+    # TODO: it might be more correct to check whether we are using
+    #   Distribute instead of setuptools, since use_2to3 doesn't take
+    #   effect when using Python 2, even when using Distribute.
+    if py_version >= (3, ):
         # Causes 2to3 to be run during the build step.
         extra['use_2to3'] = True
 
@@ -319,8 +307,6 @@ def main(sys_argv):
     # TODO: include the following in a verbose mode.
     print("pystache: using: version %s of %s" % (repr(dist.__version__), repr(dist)))
 
-    should_force2to3 = parse_args(sys_argv)
-
     command = sys_argv[-1]
 
     if command == 'publish':
@@ -332,7 +318,7 @@ def main(sys_argv):
 
     long_description = read(DESCRIPTION_PATH)
     template_files = ['*.mustache', '*.txt']
-    extra_args = get_extra_args(should_force2to3)
+    extra_args = get_extra_args()
 
     setup(name='pystache',
           version=VERSION,