searchfile = open("file.txt", "r")
for line in searchfile:
if "searchphrase" in line: print line
searchfile.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
602392714
清零编程群