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How to Get File size in bytes, KB, MB, GB, TB format, python with example


This short post explains multiple ways to get the size of a file in Python with examples

Python File Size Example

To get file size in bytes, Python provides multiple ways. The first way is using os.path.getsize() function

Syntax:

os.path.getsize(filepath)

Arguments: filepath: Path of a file.

Returns:

  • Returns file size in bytes.
  • throws OSError if the file is not found or no file read access permission

Here is an example

import os
print(os.path.getsize("./emp.json"))

Output:

129

This function internally calls to os.stat("./emp.json").st_size method.

  • use os stat function st_size property.

os module has [stat](https://docs.python.org/3/library/os.html#os.stat) function that returns os.stat_result data.

Syntax:

os.stat(filepath)

Arguments: filepath: Path of a file.

Returns:

  • Returns data of the os.stat_result class. stat_result contains st_mode, st_ino, st_dev, st_nlink, st_uid, st_gid st_size, st_atime, st_mtime, st_ctime properties. st_size contains the size of a file in bytes.

  • throws FileNotFoundError if the file is not found

import os
print(os.stat("./emp.json"))

Output:

os.stat_result(st_mode=33206, st_ino=1407374886069737, st_dev=3330445139, st_nlink=1, st_uid=0, st_gid=0, st_size=129, st_atime=1668608646, st_mtime=1668608646, st_ctime=1668608600)

To get file size in bytes, call os.start(filepath).st_size Here is an example

import os
startResult=os.stat("./emp.json")
print(startResult.st_size)

129
  • use Path(path).stat().st_size

Path class has stat() method that returns the os.stat_result, which contains st_size property to get file size.

Here is an example

import os
from pathlib import Path

startResult=Path("./emp.json").stat()
print(startResult)
print(startResult.st_size)

Output:

os.stat_result(st_mode=33206, st_ino=1407374886069737, st_dev=3330445139, st_nlink=1, st_uid=0, st_gid=0, st_size=129, st_atime=1668608646, st_mtime=1668608646, st_ctime=1668608600)
129

Convert file size in bytes to KB, MB, GB, and TB in python examples

To get the file size in KB, MB, GB, and TB bytes in python, use

Python os stat method contains the size of the file in Bytes. This example converts file size in bytes to kilobytes, megabytes, gigabytes, terabytes

  • First, find the size of a file using os.stat().st_size, returns size in bytes
  • Convert the bytes to Kilobytes(KB) using floating division with float(1024)
  • kilobytes converted to megabytes(MB) using floating division with float(1024)
  • megabytes converted to gigabytes(GB) using floating division with float(1024)
  • gigabytes converted to terabytes(TB) using floating division with float(1024)

Here is an example

import os

startResult=os.stat("b:\meeting.mp4")
sizeinbytes=startResult.st_size;

print (sizeinbytes,"Bytes")  # Bytes (B)

sizeinkb = sizeinbytes / float(1024);
print (sizeinkb,"KB")  # kilobytes (kB)

sizeinmb = sizeinkb / float(1024);
print (sizeinmb ,"MB")   # megabytes (MB)

sizeingb = sizeinmb / float(1024);
print (sizeingb,"GB")   #  gigabytes (GB)

sizeintb = sizeingb / float(1024);
print (sizeintb,"TB")   #  terabytes (TB)

Output:

3145728000 Bytes
3072000.0 KB
3000.0 MB
2.9296875 GB
0.00286102294921875 TB

Conclusion

Learned multiple ways to get file size in python example. It returns bytes and converts these to KB, MB, GB, and TB.

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