如何显示列表？

发布于 2024-12-11 23:09:10 字数 435 浏览 0 评论 0原文

我正在构建一个有效的简单函数（删除文件）。但最后我想返回已有效删除的文件列表。

这是函数：

def deleteFiles(files):
    # empty list
    RemovedFiles = list()

    for file in files:
        # Delete the file
        if os.remove(file):
            RemovedFiles.append(file)

    return RemovedFiles

我运行此函数：

print deleteFiles([/home/xyz/xyz.zip])

这有效地删除了 xyz.zip 但返回一个空列表：[]。我在这里做错了什么？

原文

I'm building a simple function that works (delete the files). But In the end I want to return the list of the files that were effectively deleted.

This is the function:

def deleteFiles(files):
    # empty list
    RemovedFiles = list()

    for file in files:
        # Delete the file
        if os.remove(file):
            RemovedFiles.append(file)

    return RemovedFiles

I run this function with:

print deleteFiles([/home/xyz/xyz.zip])

This effectively deletes the xyz.zip but returns an empty list: []. What am I doing wrong here?

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固执像三岁 2024-12-18 23:09:10

问题是 os.remove 不返回任何内容。

不过，您可以尝试和例外：

for filename in filenames:
    try:
        # try to remove the file
        os.remove(filename)
    except OSError:
        pass
        # file not removed (maybe does not exist or is write-protected)
        # you may report an error here
    else:
        # this executes only if os.remove was successful
        RemovedFiles.append(filename)

The problem is that os.remove does not return anything.

You can however try and except:

for filename in filenames:
    try:
        # try to remove the file
        os.remove(filename)
    except OSError:
        pass
        # file not removed (maybe does not exist or is write-protected)
        # you may report an error here
    else:
        # this executes only if os.remove was successful
        RemovedFiles.append(filename)

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平生欢 2024-12-18 23:09:10

os.remove() 返回 None，因此您永远无法追加到列表中。

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枫以 2024-12-18 23:09:10

os.remove()< /a> 不返回值，因此您的 if 语句变得有效。

if None:
    RemovedFiles.append(file)

另一方面，如果无法删除文件，它会抛出异常，因此以下内容应该有效：

try:
    os.remove(file)
except OSError:
    pass
else:
    RemovedFiles.append(file)

os.remove() doesn't return a value, so your if statement becomes effectively

if None:
    RemovedFiles.append(file)

On the other hand, it does throw an exception if it can't remove the file, so the following should work:

try:
    os.remove(file)
except OSError:
    pass
else:
    RemovedFiles.append(file)

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月竹挽风 2024-12-18 23:09:10

那是因为 os.remove() 不返回任何内容。您的 if 条件评估结果为 false。

试试这个：

def deleteFiles(files):
# empty list
RemovedFiles = list()

for file in files:
    # Delete the file
    try:
        os.remove(file)
        RemovedFiles.append(file)
    except OSError:
        continue

return RemovedFiles

这应该有效

That is because os.remove() does not return anything. Your if condition evaluates to false.

Try this:

def deleteFiles(files):
# empty list
RemovedFiles = list()

for file in files:
    # Delete the file
    try:
        os.remove(file)
        RemovedFiles.append(file)
    except OSError:
        continue

return RemovedFiles

This should work

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