python question

drakosha · 2006-07-21 15:26:09

Hi, to the python gurus...
in tcl you can do:

string map {aa 2a bb 2b a A b B} aaabbb => 2aA2bB

i.e. replace multiple sbstrings in a string in one command. How can it be done in python?

10x!

Titus · 2006-07-21 20:03:16

i know python but i dont know tcl so i couldn't understand your code, could you please explain that code

T-Dawg · 2006-07-21 22:32:30

I don't of anything like that in python but there are dictionaries:

>>> dict = {'aa':'2a', 'bb':'2b', 'a':'A', 'b':'B'}
>>> dict['aa']
'2a'

or map using a dictionary:

>>> def foo(x):
...     dict = {'aa':'2a', 'bb':'2b', 'a':'A', 'b':'B'}
...     return dict[x]
... 
>>> map(foo, ['aa', 'a', 'bb', 'b'])
['2a', 'A', '2b', 'B']

drakosha · 2006-07-23 11:59:06

Here's explanation:
"string map" allows to perform multiple replace of substringS at once. In the code:

string map {aa 2a bb 2b a A b B} aaabbb

"aa" is replaced with "2a", "bb" with "2b", "a" with "A" and "b" with "B". Given string "aaabbb" the result will be "2aA2bB"

Hope it's clear now

lessthanjake · 2006-07-23 12:54:34

In the string module it is a method, translate, maybe that is what you are looking for?

drakosha · 2006-07-23 13:57:36

No, translate is not good enough. It can only replace 1 char by other char, "string map" can do it with substrings
Shortest code i can think of is:

s = 'aaabbb'
for f,t in (('aa',2A'), ('bb',2B'), ('a','A'), ('b','B')): s = s.replace(f, t)

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#1 2006-07-21 15:26:09

python question

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Re: python question

#3 2006-07-21 22:32:30

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#4 2006-07-23 11:59:06

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#5 2006-07-23 12:54:34

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