How can I check file size in Python

Question

I am writing a Python script in Windows  I want to do something based on the file size  For example  if the size is greater than 0  I will send an email to somebody  otherwise continue to other things    How do I check the file size

User · Accepted Answer

You need the st size property of the object returned by os stat  You can get it by either using pathlib  Python 3 4      gt  gt  gt  from pathlib import Path  gt  gt  gt  Path  somefile txt   stat   os stat result st mode 33188  st ino 6419862  st dev 16777220  st nlink 1  st uid 501  st gid 20  st size 1564  st atime 1584299303  st mtime 1584299400  st ctime 1584299400   gt  gt  gt  Path  somefile txt   stat   st size 1564   or using os stat    gt  gt  gt  import os  gt  gt  gt  os stat  somefile txt   os stat result st mode 33188  st ino 6419862  st dev 16777220  st nlink 1  st uid 501  st gid 20  st size 1564  st atime 1584299303  st mtime 1584299400  st ctime 1584299400   gt  gt  gt  os stat  somefile txt   st size 1564   Output is in bytes

User · Answer

The other answers work for real files  but if you need something that works for  file-like objects   try this     f is a file-like object   f seek 0  os SEEK END  size   f tell     It works for real files and StringIO s  in my limited testing   Python 2 7 3   The  file-like object  API isn t really a rigorous interface  of course  but the API documentation suggests that file-like objects should support seek   and tell     Edit  Another difference between this and os stat   is that you can stat   a file even if you don t have permission to read it  Obviously the seek tell approach won t work unless you have read permission   Edit 2   At Jonathon s suggestion  here s a paranoid version   The version above leaves the file pointer at the end of the file  so if you were to try to read from the file  you d get zero bytes back      f is a file-like object   old file position   f tell   f seek 0  os SEEK END  size   f tell   f seek old file position  os SEEK SET

User · Answer

You can check a file size by using import sys print sys getsizeof your file    For example  nums   range 10000  squares    i  2 for i in nums  print sys getsizeof squares

User · Answer

Strictly sticking to the question  the Python code    pseudo-code  would be   import os file path   r  lt path to your file gt   if os stat file path  st size  gt  0       lt send an email to somebody gt  else       lt continue to other things gt

User · Answer

Using pathlib  added in Python 3 4 or a backport available on PyPI    from pathlib import Path file   Path      doc txt     or Path    doc txt   size   file stat   st size   This is really only an interface around os stat  but using pathlib provides an easy way to access other file related operations

User · Answer

You can use the stat   method from the os module  You can provide it with a path in the form of a string  bytes or even a PathLike object  It works with file descriptors as well  import os  res   os stat filename   res st size   this variable contains the size of the file in bytes

User · Answer

Using os path getsize    gt  gt  gt  import os  gt  gt  gt  b   os path getsize   path isa 005 mp3    gt  gt  gt  b 2071611   The output is in bytes

User · Answer

import os   def convert bytes num               this function will convert bytes to MB     GB    etc             for x in   bytes    KB    MB    GB    TB            if num  lt  1024 0              return   3 1f  s     num  x          num    1024 0   def file size file path               this function will return the file size             if os path isfile file path           file info   os stat file path          return convert bytes file info st size      Lets check the file size of MS Paint exe    or you can use any file path file path   r C  Windows System32 mspaint exe  print file size file path    Result   6 1 MB

User · Answer

There is a bitshift trick I use if I want to to convert from bytes to any other unit  If you do a right shift by 10 you basically shift it by an order  multiple        Example   5GB are 5368709120 bytes   print  5368709120  gt  gt  10     5242880 kilobytes  kB  print  5368709120  gt  gt  20     5120 megabytes  MB  print  5368709120  gt  gt  30     5 gigabytes  GB

User · Answer

we have two options Both include importing os module 1  import os  as os stat   function returns an object which contains so many headers including file created time and last modified time etc   among them st size gives the exact size of the file  os stat  quot filename quot   st size 2  import os In this  we have to provide the exact file path absolute path   not a relative path  os path getsize  quot path of file quot

User · Answer

Get file size   print it   process it     Os stat will provide the file size in   st size  property    The file size will be shown in bytes   import os  fsize os stat  filepath   print  size     fsize st size   str        check if the file size is less than 10 MB  if fsize st size  lt  10000000      process it

[python] How can I check file size in Python?

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