Forcing keyword arguments in python3 is not compatible with python2

[szabolcsdombi]

I run py-backwards on ModernGL

$ py-backwards -i ModernGL -o compiled -t 2.7

Compilation succeed:
  target: 2.7
  files: 14
  took: 5.31 seconds
  Additional dependencies:
    six

I the compiled version still contains lines like this:

class Buffer:
    def read(self, size=(- 1), *, offset=0):

However this syntax is invalid in python2 the * argument must be removed.

The result should be:

class Buffer:
    def read(self, size=(- 1), offset=0):

Sample code using * in python3:

>>> def foo(pos, *, forcenamed):
...   print(pos, forcenamed)
... 
>>> foo(pos=10, forcenamed=20)
10 20
>>> foo(10, forcenamed=20)
10 20
>>> foo(10, 20)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: foo() takes exactly 1 positional argument (2 given)

Useful link: Forced naming of parameters in Python

[szabolcsdombi]

#16 related

[mitar]

I made: #41