Python 在Cygwin中启动时，在virtualenvs中使用tempfile.mkdtemp（）的奇怪行为

在Python中创建临时目录时，我看到了不一致的行为：

# System Python, Windows Console

C:\Python33>python
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import tempfile
>>> tempfile.mkdtemp()
'c:\\windows\\temp\\tmpte7fcc'


# Virtualenv Python, Windows Console

Scripts>python
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import tempfile
>>> tempfile.mkdtemp()
'c:\\windows\\temp\\tmprziefb'

# System Python, Cygwin Console

$ /cygdrive/c/Python33/python.exe
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import tempfile
>>> tempfile.mkdtemp()
'c:\\windows\\temp\\tmprk4fcu'

# Virtualenv Python, Cygwin Console

$ Scripts/python
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import tempfile
>>> tempfile.mkdtemp()
'c:\\cygwin\\tmp\\tmppeozcl

前三种情况在

C:\Windows\Temp

中创建临时目录（如预期）。为什么第四种情况会在其他地方创建临时目录

---

编辑：评论中要求的其他数据：

# System Python, Windows Console

C:\Python33>python
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import tempfile
>>> tempfile._candidate_tempdir_list()
['C:\\WINDOWS\\TEMP', 'C:\\WINDOWS\\TEMP', 'c:\\temp', 'c:\\tmp', '\\temp', '\\tmp', 'C:\\Python33']
>>> [os.environ.get(envname) for envname in ('TMPDIR', 'TEMP', 'TMP')]
[None, 'C:\\WINDOWS\\TEMP', 'C:\\WINDOWS\\TEMP']


# Virtualenv Python, Windows Console

Scripts>python
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import tempfile
>>> tempfile._candidate_tempdir_list()
['C:\\WINDOWS\\TEMP', 'C:\\WINDOWS\\TEMP', 'c:\\temp', 'c:\\tmp', '\\temp', '\\tmp', 'C:\\_PROJECTS\\python-veracity']
>>> [os.environ.get(envname) for envname in ('TMPDIR', 'TEMP', 'TMP')]
[None, 'C:\\WINDOWS\\TEMP', 'C:\\WINDOWS\\TEMP']

# System Python, Cygwin Console

$ /cygdrive/c/Python33/python.exe
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import tempfile
>>> tempfile._candidate_tempdir_list()
['C:\\Cygwin\\tmp', 'C:\\WINDOWS\\TEMP', 'c:\\temp', 'c:\\tmp', '\\temp', '\\tmp', 'C:\\_PROJECTS\\python-veracity']
>>> [os.environ.get(envname) for envname in ('TMPDIR', 'TEMP', 'TMP')]
[None, 'C:\\Cygwin\\tmp', 'C:\\WINDOWS\\TEMP']

# Virtualenv Python, Cygwin Console

$ Scripts/python
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import tempfile
>>> tempfile._candidate_tempdir_list()
['C:\\Cygwin\\tmp', 'C:\\Cygwin\\tmp', 'c:\\temp', 'c:\\tmp', '\\temp', '\\tmp', 'C:\\_PROJECTS\\python-veracity']
>>> [os.environ.get(envname) for envname in ('TMPDIR', 'TEMP', 'TMP')]
[None, 'C:\\Cygwin\\tmp', 'C:\\Cygwin\\tmp']

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tempfile模块查找环境变量TMPDIR、TEMP和TMP。如果设置了其中一个变量，则其值将用作临时文件和目录的基本目录。我猜Cygwin会将其中一个设置为C:\Cygwin\tmp。

知道为什么这只发生在virtualenv中吗？tempfile的输出是什么。_candidate_tempdir_list（）和

[os.environ.get（envname）for envname in（'TMPDIR'，'TEMP'，'tmp'）]

对于每个变体，我都用您要求的数据更新了这个问题。显然，

virtualenv

环境也设置了

TMP

，这就是

mkdtemp（）

所使用的？