python - 将python脚本中的变量解析为shell

Question

大家好，我是使用 python 编写的新手，我正在尝试如何将变量解析到 shell 中。例如;

#!/usr/python3
import os
import subprocess

sometext = 'Hello World'

os.system("echo $sometext")

这什么都不返回，我假设这不会正确解析。但解释了我正在尝试做的事情。

我做了一些挖掘并尝试替换最后一行

#!/usr/python3
import os
import subprocess

sometext = 'Hello World'

subprocess.call('echo {sometext}')

这会吐出以下错误；

Shell % python3 pingtest.py
Traceback (most recent call last):
  File "pingtest.py", line 12, in <module>
    subprocess.call('echo {sometext}')
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/subprocess.py", line 340, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/subprocess.py", line 1702, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'echo {sometext}'

标签： pythonpython-3.xbashparsingsubprocess

Answer 1

#!/usr/bin/python3
import subprocess
sometext = 'Hello World'
subprocess.call(["echo", sometext])