blocks|key|1079738|text|>>>+import+os
>>>+os.stat("file").st_size+==+0
True|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1079739|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&gt;&gt;&gt; import os
&gt;&gt;&gt; os.stat("file").st_size == 0
True
</code></pre>

blocks|key|1294677|text|import+os++++
os.path.getsize(fullpathhere)+>+0|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1294678|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>import os 
os.path.getsize(fullpathhere) &gt; 0
</code></pre>

blocks|key|1079866|text|如果文件不存在，getsize()和stat()都会抛出异常。此函数将返回True/False而不抛出(更简单，但健壮性较差)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1079867|import+os
def+is_non_zero_file(fpath):++
++++return+os.path.isfile(fpath)+and+os.path.getsize(fpath)+>+0|code-block|syntax|javascript|1079868|entityMap^0|8|9|I|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

Both <code>getsize()</code> and <code>stat()</code> will throw an exception if the file does not exist. This function will return True/False without throwing (simpler but less robust):

<pre><code>import os
def is_non_zero_file(fpath): 
 return os.path.isfile(fpath) and os.path.getsize(fpath) &gt; 0
</code></pre>

blocks|key|1294732|text|如果出于某种原因，您已经打开了该文件，您可以尝试执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1294733|>>>+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"+#+The+first+character+is+the+empty+string..
...+++++else:
...+++++++++my_file.seek(0)+#+The+first+character+wasn't+empty.+Return+to+the+start+of+the+file.
...+++++++++#+Use+file+now
...
file+is+empty|code-block|syntax|javascript|1294734|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If for some reason you already had the file open, you could try this:
<pre class="lang-none prettyprint-override"><code>&gt;&gt;&gt; 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 &quot;file is empty&quot; # The first character is the empty string..
... else:
... my_file.seek(0) # The first character wasn't empty. Return to the start of the file.
... # Use file now
...
file is empty
</code></pre>

blocks|key|1294917|text|如果将Python3与pathlib一起使用，则可以使用Path.stat()方法访问os.stat()信息，该方法具有属性st_size+(文件大小，以字节为单位)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1294918|>>>+from+pathlib+import+Path
>>>+mypath+=+Path("path/to/my/file")
>>>+mypath.stat().st_size+==+0+#+True+if+empty|code-block|syntax|javascript|1294919|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.python.org/3/library/pathlib.html#pathlib.Path.stat|1|https://docs.python.org/3/library/os.html#os.stat^0|B|7|S|B|17|9|1Q|7|S|B|0|17|9|1|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]|$9|16|A|17|1|18]]|E|$]]|$1|F|3|G|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]|S|$5|N|O|P|E|$Q|T]]]]

If you are using Python 3 with <code>pathlib</code> you can access <a href="https://docs.python.org/3/library/os.html#os.stat" rel="noreferrer"><code>os.stat()</code></a> information using the <a href="https://docs.python.org/3/library/pathlib.html#pathlib.Path.stat" rel="noreferrer"><code>Path.stat()</code></a> method, which has the attribute <code>st_size</code> (file size in bytes):
<pre><code>&gt;&gt;&gt; from pathlib import Path
&gt;&gt;&gt; mypath = Path(&quot;path/to/my/file&quot;)
&gt;&gt;&gt; mypath.stat().st_size == 0 # True if empty
</code></pre>

blocks|key|1294866|text|结合ghostdog74's+answer和评论：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1294867|>>>+import+os
>>>+os.stat('c:/pagefile.sys').st_size==0
False|code-block|syntax|javascript|1294868|False表示非空文件。|style|CODE|1294869|因此，让我们编写一个函数：|1294870|import+os

def+file_is_empty(path):
++++return+os.stat(path).st_size==0|1294871|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/2507871/17772^0|2|J|0|0|0|0|5|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@$A|14|B|15|K|L]]|9|@]|C|$]]|$1|M|3|N|5|6|7|16|8|@]|9|@]|C|$]]|$1|O|3|P|5|F|7|17|8|@]|9|@]|C|$G|H]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

Combining <a href="https://stackoverflow.com/a/2507871/17772">ghostdog74's answer</a> and the comments:
<pre><code>&gt;&gt;&gt; import os
&gt;&gt;&gt; os.stat('c:/pagefile.sys').st_size==0
False
</code></pre>
<code>False</code> means a non-empty file.
So let's write a function:
<pre><code>import os

def file_is_empty(path):
 return os.stat(path).st_size==0
</code></pre>

blocks|key|1294887|text|如果你有文件对象，那么|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1294888|>>>+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|code-block|syntax|javascript|1294889|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

if you have the file object, then

<pre><code>&gt;&gt;&gt; import os
&gt;&gt;&gt; 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
</code></pre>

blocks|key|1079970|text|如果您想检查CSV文件是否为空，请尝试执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1079971|with+open('file.csv',+'a',+newline='')+as+f:
++++csv_writer+=+DictWriter(f,+fieldnames+=+['user_name',+'user_age',+'user_email',+'user_gender',+'user_type',+'user_check'])
++++if+os.stat('file.csv').st_size+>+0:
++++++++pass
++++else:
++++++++csv_writer.writeheader()|code-block|syntax|javascript|1079972|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want to check if a CSV file is empty or
not, try this:
<pre><code>with open('file.csv', 'a', newline='') as f:
 csv_writer = DictWriter(f, fieldnames = ['user_name', 'user_age', 'user_email', 'user_gender', 'user_type', 'user_check'])
 if os.stat('file.csv').st_size &gt; 0:
 pass
 else:
 csv_writer.writeheader()
</code></pre>

I have a text file. How can I check whether it's empty or not?

How to check whether a file is empty or not

我有一个文本文件。如何检查是否为空？

问如何检查文件是否为空
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