Python - 检查文件是否为空

Question

我有一个文本文件。如何检查文件是否为空或不空？

Answer 1

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

Answer 2

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

Answer 3

如果由于某种原因，你已经有文件打开，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 4

两个getsize()和stat()将抛出一个异常，如果该文件不存在。这个函数将返回真/假不抛出：

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

Answer 5

好了，所以我会结合ghostdog74's answer和意见，只是为了好玩。

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

False表示非空文件。

因此，让我们写一个函数：

import os 

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