importing a function from an external file
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# external function just combines param 1 and 2 and prints them out
external_func = __import__('file_without_py_extension').external_func
#usage
external_func("hello","world")
#output: "hello world"
#Handy when writing unittests and doctests.
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from fibo import fib, fib2
fib(500)
# 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377