搜索文本文件并在Python中打印相关行？

搜索文本文件并在Python中打印相关行？

searchfile = open("file.txt", "r")for line in searchfile:    if "searchphrase" in line: print linesearchfile.close()

打印出多行（以一种简单的方式）

f = open("file.txt", "r")searchlines = f.readlines()f.close()for i, line in enumerate(searchlines):    if "searchphrase" in line:         for l in searchlines[i:i+3]: print l,        print

逗号

print l,

防止输出中出现多余的空格。尾随的打印语句将结果划分为不同的行。

或者更好（从Mark Ransom偷回来）：

with open("file.txt", "r") as f:    searchlines = f.readlines()for i, line in enumerate(searchlines):    if "searchphrase" in line:         for l in searchlines[i:i+3]: print l,        print