subprocess.Popen execve()arg 3包含非字符串值

问题描述

我试图通过外壳程序运行另一个脚本，该脚本使用一组修改后的环境变量.

I'm trying to trying to run another script via the shell, that uses a modified set of environment variables.

def cgi_call(script, environ):
    pSCRIPT = subprocess.Popen(script, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                        stdin=subprocess.PIPE, env=environ, shell=True)

    pc = pSCRIPT.communicate()

    status = "200 OK"
    headers = [('Content-Type',"text/html")]
    if pc[1] != '':
        raise RuntimeError, pc[1]
    else:
        rval = str(pc[0])

    return status, headers, rval

运行上面的代码后，出现以下错误:

After running the code above, I get the following error:

File "server/httpd.py", line 76, in DynamicServer
    status, headers, rval = handler(environ)
File "server/httpd.py", line 43, in handler
    status, headers, rval = cgi_call(srvpath+"../www/public_html"+environ["PATH_INFO"]+'index.py',environ)
File "server/httpd.py", line 21, in cgi_call
    stdin=subprocess.PIPE, env=environ, shell=True)
File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
    raise child_exception
<type 'exceptions.TypeError'> execve() arg 3 contains a non-string value

传递环境变量时出现错误...我也尝试过将它们作为字符串传递-错误并指出需要一个映射对象.但是，实际上，正在传递的环境是一个映射对象...

The error comes when passing the environment variables... I've also tried passing them as a string - It errors out and says that it needs a mapping object. However, as it is, the environ being passed IS a mapping object...

出什么问题了?

其他信息:我在Ubuntu 12.04.1上运行Python 2.7

Additional Information:I am running Python 2.7 on Ubuntu 12.04.1

推荐答案

从注释中复制答案，以便从未答复"过滤器中删除此问题:

Copying the answer from the comments in order to remove this question from the "Unanswered" filter:

"...... Python 2.x中的键以及可能的值也必须是字节字符串.因此，如果您使用的是unicode字符串，请确保将其编码为 utf-8 .另外，如果默认情况下通过__future__ import unicode_literals 中的使用Unicode文字，请确保字典键的字符串文字以 b 为前缀，而不是字节文字unicode文字."

"...the keys, and possibly the values also, in Python 2.x need to be byte strings. So if you are using unicode strings, make sure you encode them to utf-8. Also, if you are using unicode literals by default via from __future__ import unicode_literals make sure your string literals for the dictionary keys are prefixed with b to be byte literals instead of unicode literals."

〜根据 Pedro Romano

这篇关于subprocess.Popen execve()arg 3包含非字符串值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！