How to dynamically create a function in Python?

I saw a few answers here but I couldn't find one which would describe the most general case.

Consider:

def a(x):

return x + 1

How to create such function on-the-fly? Do I have to compile('...', 'name', 'exec') it? But what then? Creating a dummy function and replacing its code object for then one from the compile step?

Or should I use types.FunctionType? How?

I would like to customize everything: number of argument, their content, code in function body, the result, ...

解決方案

Use exec:

>>> exec("""def a(x):

... return x+1""")

>>> a(2)

3

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