How can I convert strings from a text file into matrix (python)

Question

For example: content of myfile has

    fsdfasf
    frjfmcd
    39djaxs

I want to convert this in to a matrix where it consists of my_matrix=[['f','s','d','f','a','s','f'],['f','r','j'......]]

I've tried reading the file using

for line in file:
        line = line.strip('\n)
        print(line)

But it's not giving me the desired output.

What am I missing to do?

Convert each line to a list (list(line) should do) and append each list to a final result list. — Michael Butscher
– Michael Butscher, Commented Nov 14, 2020 at 21:30

Mark · Accepted Answer · 2020-11-14 21:30:56Z

4

You need to turn your string into a list to get the output you want. Since strings are sequences, when you pass a string to list() if breaks it up into individual characters:

with open(path) as file:
    matrix = [list(line.strip()) for line in file]

matrix:

[['f', 's', 'd', 'f', 'a', 's', 'f'],
 ['f', 'r', 'j', 'f', 'm', 'c', 'd'],
 ['3', '9', 'd', 'j', 'a', 'x', 's']]

answered Nov 14, 2020 at 21:30

Mark

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2 Comments

Rae Leng Over a year ago

thank you, this resolved my problem. I am not familiar with the notation you used for variable matrix. What is it called and how can I convert it into a notation that is "easier"

Mark Over a year ago

@RaeLeng that's called a list comprehension — it's not to hard once you get used to it and it's pretty fundamental to python.

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