os.path.getsize 报告的文件大小末尾带有 L，为什么？

import os, sys

def crawlLocalDirectories(directoryToCrawl):
    crawledDirectory = [os.path.join(path, subname) for path, dirnames, filenames in os.walk(directoryToCrawl) for subname in dirnames + filenames]
    return crawledDirectory

print crawlLocalDirectories('.')

dictionarySize = {}
def getSizeOfFiles(filesToMeasure):
    for everyFile in filesToMeasure:
        size = os.path.getsize(everyFile)
        dictionarySize[everyFile] = size
    return dictionarySize

print getSizeOfFiles(crawlLocalDirectories('.'))

每当运行时，我都会得到输出{'example.py':392L}， 为什么？ L是什么？我不想最后把 L 去掉。

如果我运行它而不将其添加到字典中，它会返回文件大小为392.

这仅在交互模式下或当您通过获取字符串表示形式时显示repr()。正如 Zigg 所写，你可以简单地忽略它。将此视为一个实现细节。当区分普通 int 和 long int 很重要时，它可能很有用。在Python 3中，没有L， 例如。无论多大，int 都是 int：

d:\>py
Python 3.2.1 (default, Jul 10 2011, 20:02:51) [MSC v.1500 64 bit (AMD64)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> a = 100000000000000000000000000000000000000000000
>>> a
100000000000000000000000000000000000000000000
>>> ^Z

d:\>python
Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> a = 100000000000000000000000000000000000000000000
>>> a
100000000000000000000000000000000000000000000L
>>>

注意LPython 2.7 与此类似，但 Python 3.2 没有类似的情况。