Question

How to delete lines from text file when X character not match in Python

Answer 1

with open('d:\data.txt') as file:
    lines = file.readlines()
    result = []
    ch = 'a'
    for line in lines:
        if ch in line:
            result.append(line)

with open('d:\data.txt', 'w') as file:
    file.writelines(result)


'''
run:

aaa bbb ccc
ddd aaa kkk
qqq xxx aaa

'''

 

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