Modify variable value in text file with python

Question

I have a text file with the following content;

variable_1 = 1;
variable_2 = 2;
variable_3 = 3;
variable_4 = 4;

Using python, I would like to modify variable_2 to 22 and variable_3 to 33 such that the text file will look like this;

variable_1 = 1;
variable_2 = 22;
variable_3 = 33;
variable_4 = 4;

How can this be done using python v3.8?

question from:https://stackoverflow.com/questions/65850246/modify-variable-value-in-text-file-with-python

Answer 1

urls = open('variables.txt', 'r')
lines = urls.readlines()  # read all the lines of txt
urls.close()

for index, line in enumerate(lines):  # iterate over each line
    if index == 1:
        line_split = line.split(';')
        line = line_split[0] + '2;
'
    if index == 2:
        line_split = line.split(';')
        line = line_split[0] + '3;
'
    lines[index] = line

with open('variables.txt', 'w') as urls:
    urls.writelines(lines)  # save all the lines