'async' and 'await' will become keywords in Python 3.7

[berkerpeksag]

The following code won't work in Python 3.7:

https://github.com/berkerpeksag/astor/blob/5f189fc5cae9a5c3ca75bc204a8ac9a361b4bcc7/astor/code_gen.py#L311

Full list:

astor/code_gen.py:311:    def visit_FunctionDef(self, node, async=False):
astor/code_gen.py:312:        prefix = 'async ' if async else ''
astor/code_gen.py:325:        self.visit_FunctionDef(node, async=True)
astor/code_gen.py:367:    def visit_For(self, node, async=False):
astor/code_gen.py:369:        prefix = 'async ' if async else ''
astor/code_gen.py:376:        self.visit_For(node, async=True)
astor/code_gen.py:383:    def visit_With(self, node, async=False):
astor/code_gen.py:384:        prefix = 'async ' if async else ''
astor/code_gen.py:395:        self.visit_With(node, async=True)

[vodik]

Do you have a particular solution in mind? Or am I free to adjust this? I don't image its technically part of your public API.

[berkerpeksag]

I'm planning to rename async to is_async. Would you like to submit a PR?

[berkerpeksag]

Also, I wonder if we can drop the async keyword argument and replace

prefix = 'async ' if async else ''

with

prefix = 'async ' if self.get_is_async(node) else ''

in visit_FunctionDef.

[vodik]

Yeah, sure, I can do that.

[zackmdavis]

(Sorry, I should have foreseen that this was going to be a problem in #19)