python - 在 Python 中集成 grep

Question

我正在尝试学习一点Python，我的目标是打开gzip文件，输入搜索查询然后打印出来，最终将结果输出到文件中。

import gzip
file = raw_input('Input Filepath: ')  # input file path
with gzip.open(file, 'rb') as f:  # opens gzip fil .gz
    file_content = f.read()  # reads the contents
    grep = raw_input('Enter Search: ')  # grep asks for output
print(file_content)  # prints it in console

我也尝试过使用 print(file_content, grep)，但它只返回第一个查找结果。

Answer 1

grep 实用程序将搜索与给定模式匹配的行。

要在 python 中执行此操作，您需要逐行读取文件，然后在每一行中搜索您想要查找的字符串:

import gzip

matched_lines = []
file = raw_input('Imput Filepath: ')
with gzip.open( file, 'rb') as f:
    grep = raw_input('Enter Search: ')
    for line in f: # read file line by line
        if grep in line: # search for string in each line
            matched_lines.append(line) # keep a list of matched lines

file_content = ''.join(matched_lines) # join the matched lines

print(file_content)