[Python] Import from file without executing imports at the top of that file

I have one file, foo.py

import UnavailableModule

class Bob:
def useful_func(self, arg):
# Do useful stuff (doesn't use UnavailableModule)


And in another file bar.py in the same directory, I need useful_func() but can't do this

from foo.Bob import useful_func


because it results in

problem: [Error 126] The specified module could not be found
An exception has occurred, use %tb to see the full traceback.


with traceback

C:\...\bar.py in <module>()
----> 1 from foo.Bob import useful_func
C:\...\foo.py in <module>()
----> 1 import UnavailableModule


Is it possible to just get useful_func() only by some other means?

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