如何从子流程输出中仅获取特定的一行

Question

I know how to search if specific word exists in subprocess output. But how can I print out only one specific line, if I know this line always looks like:

This is the line:    some text

"Some text" can have different values.

What I have:

variable = subprocess.call(["some", "command"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = output.communicate()

What I want to get after executing the script:

This is the line:    some text

Answer 1

import subprocess
p = subprocess.Popen(["some", "command"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
stdout=stdout.split("\n")
for line in stdout:
    if line.startswith("This is the line:"):
        print line