python执行cmd命令

最典型的模块

一，执行cmd并读取返回值

代码语言：javascript复制

import subprocess

p = subprocess.Popen("ls",
        stdout=subprocess.PIPE, universal_newlines=True)
p.wait()
result_lines = p.stdout.readlines()

for line in result_lines:
    print(line)

二，执行cmd命令

代码语言：javascript复制

import subprocess

cmd = "ffmpeg -i bb_short.mp4 -vf "select='eq(pict_type,  PICT_TYPE_I)'" -vsync vfr out%d.png"
p = subprocess.Popen(cmd, shell=True)
p.wait()

cmd

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