Using Python to convert a string to an int. and only return a portion of the string

Question

I'm very new to Python. I want to use python to convert a string to and integer and return only a portion of the string. I have the following string C000004N_37. I want to convert and return just the 37 of the string.

Why 37? Why not 4? 4 is present in a portion of your string. — Kevin, Sep 17 '15 at 19:38
This is a good place to start. http://stackoverflow.com/questions/509211/explain-pythons-slice-notation — DJMcMayhem, Sep 17 '15 at 19:38
Will the integer you want to return always be preceded by "_"? — J. Corson, Sep 17 '15 at 19:39
if the position of the string components is fixed, you use slicing, e.g. `n=int(s[-2:])` where s is `C000004N_37` — Pynchia, Sep 17 '15 at 19:42
37 is the reference marker for this route. yes the int will always come after the _. The route name is always C######@_the mile post. the mile post could be 0-700 — Gus, Sep 17 '15 at 19:47

J. Corson · Answer 1 · 2015-09-18T00:07:03.680

1

Will this work for you:

def get_route_marker(user_string):
    return int(user_string.split('_')[-1])

If all of your strings are in a list called 'list_of_strings':

route_markers = [get_route_marker(user_string) for user_string in list_of_strings]

edited Sep 18 '15 at 00:07

answered Sep 17 '15 at 19:56

J. Corson

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It will work for that individual corridor's records.. But I have several hundred corridors. I was trying to figure out so it would be like int(C######N_###.split('_')[-1]) – Gus Sep 17 '15 at 20:53
I edited the code to work on any such formatted string. – J. Corson Sep 17 '15 at 23:47

Using Python to convert a string to an int. and only return a portion of the string

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