How to Get File Size in Python

The python os module has stat() function where we can pass the file name as argument. This function returns a tuple structure that contains the file information. We can then get its st_size property to get the file size in bytes. Here is a simple program to print the file size in bytes and megabytes.

# get file size in python
import os

file_name = "/Users/pankaj/abcdef.txt"

file_stats = os.stat(file_name)

print(file_stats)
print(f'File Size in Bytes is {file_stats.st_size}')
print(f'File Size in MegaBytes is {file_stats.st_size / (1024 * 1024)}')

Output:

If you look at the stat() function, we can pass two more arguments: dir_fd and follow_symlinks. However, they are not implemented for Mac OS. Here is an updated program where I am trying to use the relative path but it’s throwing NotImplementedError.

# get file size in python
import os

file_name = "abcdef.txt"
relative_path = os.open("/Users/pankaj", os.O_RDONLY)

file_stats = os.stat(file_name, dir_fd=relative_path)

Output:

Traceback (most recent call last):
  File "/Users/pankaj/.../get_file_size.py", line 7, in 
    file_stats = os.stat(file_name, dir_fd=relative_path)
NotImplementedError: dir_fd unavailable on this platform