mitodl / mitx-grading-library / 493

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Pull #215

travis-ci

make get_number_of_args raise an error in Py2 if used with constructor

When used on class constructors:

```python
class Foo(object):

    def __call__(self, x):
        return x
```
get_number_of_args_py2 previously returned the number of arguments in Foo.__call__, which was incorrect, since calling Foo(...) would run the __init__ method!

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