Regular Expression on Python

Question

I write the solution of my code on a file and I need to read it for another code. But there is one problem , in the file which saves the solution , the variables are like:

x[1][1]=3 x[1][2]=5 x[1][3]=9 x[2][1]=3 x[2][2]=5 x[2][3]=9

what I need is :

x[1][1]=3 x[2][1]=5 x[3][1]=9 x[1][2]=3 x[2][2]=5 x[3][2]=9

how can I flip the for loop to change the indexes to the other way? I learnt that I can make regex on python but since I could not find a good example of it, I could not apply it. Can you give me an example for how to do it ? Thank you so much

show us the code that stores this and fix that ...

Patrick Artner
– Patrick Artner

2018-10-21 19:03:35 +00:00
Commented Oct 21, 2018 at 19:03 — Patrick Artner
– Patrick Artner, Commented Oct 21, 2018 at 19:03

Christian Sloper · Accepted Answer · 2018-10-21 19:04:00Z

2

Read it as normal, then transpose.

You can transpose like this :

     x = list(map(list, zip(*x)))

Transpose "flips" the indices in the table.

answered Oct 21, 2018 at 19:04

Christian Sloper

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R. Davidson · Accepted Answer · 2018-10-22 17:14:25Z

2

Actually transposing the list per Christian Sloper's suggestion is probably the most principled thing to do, but if you truly want to use regex to transform the string "list[x][y]" into "list[y][x]", that's very doable:

import re
input_string = "list[3][4], list[7][8]"
pattern = r"\[(\d+)\]\[(\d+)\]"
repl = r"[\2][\1]"
re.sub(pattern, repl, input_string) #list[4][3], list[8][7]

edited Oct 22, 2018 at 17:14

answered Oct 21, 2018 at 20:48

R. Davidson

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