python compute closeness of strings -

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i want compare string representations of 3 or 4 digit integers. want group them pairs of 'closeness'. is, pc_dud[3] should pair dud[0]. 

dud = ['3433', '3467', '3551', '345', '345', '3613']  pc_dud = ['3401', '3402', '3430', '0342', '3584']

does know of tool out there (i thinking myself maybe jellyfish)? solution of course use arithmetical difference indicator 'closeness'. thoughts?

you can use difflib module:

example:

>>> import difflib >>> dud = ['3433', '3467', '3551', '345', '345', '3613']  >>> pc_dud = ['3401', '3402', '3430', '0342', '3584'] >>> difflib.get_close_matches(dud[0], pc_dud) ['3430']

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