[英]Remove all lines before specific string starts python
我的输出(字符串):
First Line
second something aaa
MY2 asd hello
no one nothing
我需要先删除所有linew,然后MY2
输出应显示为line:
MY2 asd hello
no one nothing
代码:(不起作用)
output= '\n'.join(output.split('\n'))
for line in output:
a=output.strip()=='MY2'
print(a)
您可以遍历所有行,并在遇到字符串时保留标志。
output = """First Line
second something aaa
MY2 asd hello
no one nothing """
set_print = False
for line in output.split('\n'):
if line.startswith('MY2'):
set_print = True
if set_print:
print(line)
使用itertools.dropwhile
功能:
from itertools import dropwhile
output = '''First Line
second something aaa
MY2 asd hello
no one nothing'''
for l in dropwhile(lambda s: not s.startswith('MY2'), output.splitlines()):
print(l)
输出:
MY2 asd hello
no one nothing
另一个解决方案,使用re
模块( regex101 ):
output = '''First Line
second something aaa
MY2 asd hello
no one nothing'''
import re
print( re.findall(r'^(MY2.*)', output, flags=re.S|re.M)[0] )
打印:
MY2 asd hello
no one nothing
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