运行OpenSSL系统调用

Python新手,无法使用。我需要创建一个openSSL进程。以下是我所拥有的:

from subprocess import call

cmd = "openssl aes-128-cbc -d -in ciphertext -base64 -pass pass:test123"
decrypted = call(cmd)
print (decrypted)

这甚至无法编译。我明白了 TypeError: 'function' object is not subscriptable

有人能告诉我怎么做吗?谢谢

顺便说一句,当我在终端中键入cmd字符串时,它工作正常。

编辑:我换了行 decrypted = call[cmd] 到 decrypted = call(cmd) 。当我这样做时,我会得到以下错误序列:

Traceback (most recent call last):
..., line 14, in <module>
    plaintext = call(cmd)
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/subprocess.py", line 523, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/subprocess.py", line 817, in __init__
    restore_signals, start_new_session)
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/subprocess.py", line 1441, in _execute_child
    raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'openssl aes-128-cbc -d -in test.enc -base64 -pass pass:hello'