Generate safe filenames using Python

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This function removes illegal  characters to create file names that are safe to use on most operating systems.

import string

## Make a file name that only contains safe charaters
# @param inputFilename A filename containing illegal characters
# @return A filename containing only safe characters
def makeSafeFilename(inputFilename):   
     safechars = string.letters + string.digits + " -_."
    return filter(lambda c: c in safechars, inputFilename)
     return ""  

print makeSafeFilename("test1******.txt")  # test1.txt

print makeSafeFilename("test2:\.txt") # test2.txt

print makeSafeFilename("test39328764876!%^&*().txt") # test39328764876.txt

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