如何检查文件是否为空？

Question

我有一个文本文件.
如何检查它是否为空？

Answer 1

>>> import os
>>> os.stat("file").st_size == 0
True

Answer 2

import os    
os.path.getsize(fullpathhere) > 0

Answer 3

双方getsize()并stat()会抛出一个异常,如果该文件不存在.此函数将返回True/False而不抛出:

import os
def is_non_zero_file(fpath):  
    return os.path.isfile(fpath) and os.path.getsize(fpath) > 0

Answer 4

如果由于某种原因你已经打开文件你可以试试这个:

>>> with open('New Text Document.txt') as my_file:
...     # I already have file open at this point.. now what?
...     my_file.seek(0) #ensure you're at the start of the file..
...     first_char = my_file.read(1) #get the first character
...     if not first_char:
...         print "file is empty" #first character is the empty string..
...     else:
...         my_file.seek(0) #first character wasn't empty, return to start of file.
...         #use file now
...
file is empty

Answer 5

如果您使用的是 Python 3，则pathlib可以os.stat()使用Path.stat()具有属性st_size（文件大小以字节为单位）的方法访问信息：

>>> from pathlib import Path
>>> mypath = Path("path/to/my/file")
>>> mypath.stat().st_size == 0 # True if empty

Answer 6

好的,所以我会把ghostdog74的答案和评论结合起来,只是为了好玩.

>>> import os
>>> os.stat('c:/pagefile.sys').st_size==0
False

False 表示非空文件.

那么让我们写一个函数:

import os

def file_is_empty(path):
    return os.stat(path).st_size==0

Answer 7

如果你有文件对象，那么

>>> import os
>>> with open('new_file.txt') as my_file:
...     my_file.seek(0, os.SEEK_END) # go to end of file
...     if my_file.tell(): # if current position is truish (i.e != 0)
...         my_file.seek(0) # rewind the file for later use 
...     else:
...         print "file is empty"
... 
file is empty