Get file size python – Python: Get file size in KB, MB, or GB – human-readable format

Get file size python: In this tutorial of getting the file size in KB, MB, or GB in Human-readable format in Python, we are going to see how we can get the sizes of different files in bytes, kilobytes, megabytes, gigabytes, etc.

Different ways to get file size in Bytes, Kilobytes, Megabytes, Gigabytes, etc

1. Get file size using os.path.getsize()
2. Get file size using os.stat().st_size
3. Get size using pathlib.Path.stat().st_size
4. Get file size in KiloBytes, MegaBytes, or GigaBytes

Method-1: Get file size in bytes using os.path.getsize()

Python get file size: In this function, we pass the path of the file into it and if the file exists it returns the file size in bytes. If the file does not exist it throws os.error.

Syntax:

Syntax : os.path.getsize(path)

Source Code:

# Program to Get file size in bytes using os.path.getsize()

import os
def fileSizeInBytes(filePath):
"""Size of the file in bytes"""
sizeOfFile = os.path.getsize(filePath)
return sizeOfFile
filePath = 'movie.mkv'
#Getting the size of the file from by passing the path into the function
sizeOfFile = fileSizeInBytes(filePath)
print('Size of the file(In Bytes) - ', sizeOfFile)

Output :
Size of the file(In Bytes) -  349016027

Method-2: Get file size in bytes using os.stat().st_size

Python check file size: We can also find the size of the file using a stats( ) function available in Python’s OS module. It takes the file path as an argument and returns an object containing the file details.

Syntax:

os.stat(path, *, dir_fd=None, follow_symlinks=True)

Source Code:

# Program to Get file size in bytes using os.stat().st_size

import os
def fileSizeInBytes(filePath):
"""Find the size of the file in bytes"""
statOfFile = os.stat(filePath)
#Size of file from the stats
sizeOfFile = statOfFile.st_size
return sizeOfFile
filePath = 'movie.mkv'
#Getting the size of the file from by passing the path into the function
sizeOfFile = fileSizeInBytes(filePath)
print('Size of the file(In Bytes) - ', sizeOfFile)

Output :
Size of the file(In Bytes) -  349016027

Method-3: Get file size in bytes using pathlib.Path.stat().st_size

# program to Get file size in bytes using pathlib.Path.stat().st_size

from pathlib import Path
def fileSizeInBytes(filePath):
"""Size of the file in bytes"""
fileObj = Path(filePath)
#Size of file from the stats
sizeOfFile = fileObj.stat().st_size
return sizeOfFile
filePath = 'movie.mkv'
#Getting the size of the file from by passing the path into the function
sizeOfFile = fileSizeInBytes(filePath)
print('Size of the file(In Bytes) - ', sizeOfFile)

Output :
Size of the file(In Bytes) -  349016027

Method-4: Get file size in human-readable units like kilobytes (KB), Megabytes (MB), or GigaBytes (GB)

File size python: We can get the file sizes using the above method but we can not convert them to KB, MB, GB, TB directly so we have to create a function. The function would convert the units and so us the size of the file in our desired unit.

Here is a conversion table to switch from bytes to another unit of measurement :

 Units Number of bytes KiloBytes 1024 MegaBytes 1024*1024 = 1 048 576‬ GigaBytes 1024*1024*1024 = 1 073 741 824

et file size in human-readable units like kilobytes (KB), Megabytes (MB), or GigaBytes (GB

#Program to Get file size in human-readable units like KB, MB, GB, TB

import enum
import os

class sizeUnit(enum.Enum):
#class to store the various units
BYTES = 1
KB = 2
MB = 3
GB = 4

def unitConvertor(sizeInBytes, unit):
#Cinverts the file unit
if unit == sizeUnit.KB:
return sizeInBytes/1024
elif unit == sizeUnit.MB:
return sizeInBytes/(1024*1024)
elif unit == sizeUnit.GB:
return sizeInBytes/(1024*1024*1024)
else:
return sizeInBytes

def fileSize(filePath, size_type):
"""File size in KB, MB and GB"""
size = os.path.getsize(filePath)
return unitConvertor(size, size_type)

filePath = 'movie.mkv'
sizeOfFile = fileSize(filePath,sizeUnit.BYTES)
print('Size of the file in - ', sizeOfFile)
#Printing the size of file in KB
sizeOfFile = fileSize(filePath,sizeUnit.KB)
print('Size of the file in KB - ', sizeOfFile)
#Printing the size of file in MB
sizeOfFile = fileSize(filePath,sizeUnit.MB)
print('Size of the file in MB - ', sizeOfFile)
#Printing the size of file in GB
sizeOfFile = fileSize(filePath,sizeUnit.GB)
print('Size of the file in GB - ', sizeOfFile)

Output :
Size of the file in -  349016027
Size of the file in KB -  340835.9638671875
Size of the file in MB -  332.8476209640503
Size of the file in GB -  0.32504650484770536

Check if the file exists before checking for the size of the file

Size of file python: In case the file does not exist it will throw an error disrupting our program’s execution. So to handle that we can check if the file exists or not and if not then handle it by using the if-else block.

# Program to check if the file exists before checking for the size of the file

import os

def fileSizeInBytes(filePath):
""" Size of the file in bytes"""
sizeOfFile = os.path.getsize(filePath)
return sizeOfFile

#Passing a file name that does not exist into the program
fileName = 'nonExistentFile.txt'
if os.path.exists(fileName):
size = fileSizeInBytes(fileName)
print('Size of file in Bytes : ', size)
else:
print('File not there')

Output :
File not there