为什么 subprocess.py 抛出 WindowsError？

Question

我正在尝试使用 testing.postgresql 包来测试一些脚本，并且运行在实例化 testing.postgresql.Postgresql() 或 testing.postgresql 时出现此错误.PostgresqlFactory():

File "<stdin>", line 1, in <module>
File "C:\Python27\lib\site-packages\testing\common\database.py", line 83, in __init__
  self.initialize()
File "C:\Python27\lib\site-packages\testing\postgresql.py", line 50, in initialize
  self.initdb = find_program('initdb', ['bin'])
File "C:\Python27\lib\site-packages\testing\postgresql.py", line 134, in find_program
  path = get_path_of(name)
File "C:\Python27\lib\site-packages\testing\common\database.py", line 288, in get_path_of
  stderr=subprocess.PIPE).communicate()[0]
File "C:\Python27\lib\subprocess.py", line 710, in __init__
  errread, errwrite)
File "C:\Python27\lib\subprocess.py", line 960, in _execute_child
  startupinfo)
WindowsError: [Error 2] The system cannot find the file specified

根据我跟踪跟踪和在线搜索的结果，subprocess.py 找不到 initdb.exe。 subprocess.py 移交给扩展模块 _subprocess.c 的确切原因变得更加模糊。

我已经尝试将包含 initdb 的目录添加到系统 PATH 中，不行。

有没有其他人遇到过这个问题，或者对这里发生的事情有任何见解？

Answer 1

查看源代码，这似乎与 Windows 不兼容。该软件包需要一个 UNIX 风格的环境。

testing.postgresql/src/testing/postgresql.py

def find_program(name, subdirs):
     path = get_path_of(name)
     if path:
        return path

    for base_dir in SEARCH_PATHS:
        for subdir in subdirs:
            path = os.path.join(base_dir, subdir, name)
            if os.path.exists(path):
                return path

     raise RuntimeError("command not found: %s" % name)

testing.common.database

def get_path_of(name):
     path = subprocess.Popen(['/usr/bin/which', name],
                        stdout=subprocess.PIPE,
                        stderr=subprocess.PIPE).communicate()[0]
     if path:
         return path.rstrip().decode('utf-8')
     else:
         return None

编辑以根据@eryksun 下面的评论显示正确的问题来源。

为什么 subprocess.py 抛出 WindowsError？

Why is subprocess.py throwing a WindowsError?

python

windows

postgresql

subprocess

windowserror