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Python Module4 File Handling

This document covers file handling operations in Python, including creating, reading, writing, copying, moving, and deleting files and folders. It also discusses compressing files, logging, and using assertions and exceptions. Additionally, it provides examples for renaming date formats and backing up folders into ZIP files.

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jamiabad10
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4 views3 pages

Python Module4 File Handling

This document covers file handling operations in Python, including creating, reading, writing, copying, moving, and deleting files and folders. It also discusses compressing files, logging, and using assertions and exceptions. Additionally, it provides examples for renaming date formats and backing up folders into ZIP files.

Uploaded by

jamiabad10
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Python File Handling - Module 4

1. File Operations in Python

File handling allows us to create, read, write, and close files in Python.

Example - Writing and Reading:

with open('data.txt', 'w') as f:

f.write('Hello World!')

with open('data.txt', 'r') as f:

print(f.read())

2. Copy Files and Folders

import shutil

shutil.copy('src.txt', 'dest.txt') # Copy file

shutil.copytree('src_folder', 'dest_folder') # Copy folder

3. Moving Files and Folders

import shutil

shutil.move('file.txt', 'new_folder/')

4. Compressing Files (ZIP)

import zipfile

with zipfile.ZipFile('example.zip', 'r') as zip:

zip.extractall('folder')

print(zip.namelist())

Benefits: Saves space, faster transfer, archive multiple files.

5. shutil.copy() vs shutil.copytree()
shutil.copy(): Copies single file

shutil.copytree(): Copies entire directory

6. File Deletion

import os

os.remove('file.txt') # Permanent

from send2trash import send2trash

send2trash('file.txt') # Safe delete

7. Assertion and Exceptions

assert a > 0, 'a must be > 0'

if b == 0: raise ZeroDivisionError('b cannot be 0')

8. Logging in Python

import logging

logging.basicConfig(level=logging.INFO)

logging.info('Start')

Levels: DEBUG, INFO, WARNING, ERROR, CRITICAL

9. DivExp Function with Assertion

def DivExp(a, b):

assert a > 0

if b == 0: raise ZeroDivisionError

return a / b

10. Renaming American to European Dates

Use re module to find pattern (MM-DD-YYYY) and rename to (DD-MM-YYYY)

11. Backup Folder into ZIP


def backup_to_zip(folder):

with zipfile.ZipFile('backup.zip', 'w') as zip:

for foldername, subfolders, files in os.walk(folder):

for file in files:

zip.write(...)

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