os.path.getsize报告一个文件大小与L在结尾，为什么？ [英] os.path.getsize reports a filesize with an L at the end, why?

问题描述

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('.'))

，我得到 {'example.py'：392L} 的输出，为什么？什么是L？我不想在结束时关闭L。

Whenever this is ran, I get the output of {'example.py':392L}, why? What's an L? I don't want to have to strip the L off at the end.

如果我没有将其添加到字典中，则运行它，它返回文件大小为 392 。

If I run it without adding it to a dictionary, it comes back with the filesize as 392.

推荐答案

这仅显示或以交互模式或当您通过 repr（）获取字符串表示。正如zigg所写，你可以简单地忽略它。请考虑一个实现细节。在正常int和long int之间做出区别很重要的时候，它可能是有用的。在Python 3中，例如没有 L 。 int是int，不管多大：

This is only displayed or in interactive mode or when you get the string representation via repr(). As zigg wrote, you can simply ignore it. Consider this an implementation detail. It was probably usefull in time when it was important to make a difference between normal int and long int. In Python 3, there is no L, for example. The int is int no matter how big:

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
>>>

请注意Python 2.7中的 L 没有相似的Python 3.2。

Notice the L by Python 2.7, but nothing similar by Python 3.2.

这篇关于os.path.getsize报告一个文件大小与L在结尾，为什么？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！