在Python中，如何检查驱动器是否存在w / o为可移动驱动器引发错误？ [英] In Python, how do I check if a drive exists w/o throwing an error for removable drives?

问题描述

这是我到目前为止：

import os.path as op
for d in map(chr, range(98, 123)): #drives b-z
    if not op.isdir(d + ':/'): continue

问题是它在Windows中弹出一个无磁盘错误框：

The problem is that it pops up a "No Disk" error box in Windows:

maya .exe - 无磁盘：
中没有磁盘。请将磁盘插入
驱动器\Device\Harddisk1\DR1 [取消，再次尝试，继续]

maya.exe - No Disk: There is no disk in the drive. Please insert a disk into drive \Device\Harddisk1\DR1 [Cancel, Try Again, Continue]

我不能捕获异常，因为它并没有引起Python错误。

I can't catch the exception because it doesn't actually throw a Python error.

显然，这只会发生在可分配的字母的可移动驱动器上，但没有驱动器插入。

Apparently, this only happens on removable drives where there is a letter assigned, but no drive inserted.

有没有一个方法来解决这个问题，没有具体说明脚本哪个驱动器跳过？

Is there a way to get around this issue without specifically telling the script which drives to skip?

在我的情况下，我在学校实验室，驱动器号改变取决于我在哪个实验室计算机。另外，我有零安全权限访问磁盘管理。

In my scenario, I'm at the school labs where the drive letters change depending on which lab computer I'm at. Also, I have zero security privileges to access disk management.

推荐答案

使用 ctypes 包以访问 GetLogicalDrives 功能。这不需要诸如pywin32这样的外部库，所以它是便携式的，尽管它有点小巧。例如：

Use the ctypes package to access the GetLogicalDrives function. This does not require external libraries such as pywin32, so it's portable, although it is a little clunkier to work with. For example:

import ctypes
import itertools
import os
import string
import platform

def get_available_drives():
    if 'Windows' not in platform.system():
        return []
    drive_bitmask = ctypes.cdll.kernel32.GetLogicalDrives()
    return list(itertools.compress(string.ascii_uppercase,
               map(lambda x:ord(x) - ord('0'), bin(drive_bitmask)[:1:-1])))

itertools.compress 添加在Python 2.7和3.1中;如果您需要支持< 2.7或< 3.1，这是该功能的实现：

itertools.compress was added in Python 2.7 and 3.1; if you need to support <2.7 or <3.1, here's an implementation of that function:

def compress(data, selectors):
    for d, s in zip(data, selectors):
        if s:
            yield d

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