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How to filter file content in python

王林
Release: 2024-03-01 21:04:13
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How to filter file content in python

In python, you can use the following methods to filter file content:

  1. Use the readlines() method to read all lines of the file and use conditional statements to filter the content. For example, to filter out lines containing a specific keyword:
with open('file.txt', 'r') as file:
lines = file.readlines()
filtered_lines = [line for line in lines if 'keyWord' in line]
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  1. Use a for loop to read the file line by line, and then use conditional statements to filter the content. For example, to filter out lines longer than 10:
with open('file.txt', 'r') as file:
filtered_lines = []
for line in file:
if len(line) > 10:
filtered_lines.append(line)
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  1. Use regular expressions modulere to match and filter content. For example, to filter out rows matching a specific pattern:
import re

with open('file.txt', 'r') as file:
lines = file.readlines()
pattern = r'^[A-Za-z]+\d+'
filtered_lines = [line for line in lines if re.match(pattern, line)]
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