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1. Reading a File
To read the entire content of a file:
with open('example.txt', 'r') as file:
content = file.read()
print(content)2. Writing to a File
To write text to a file, overwriting existing content:
with open('example.txt', 'w') as file:
file.write('Hello, Python!')3. Appending to a File
To add text to the end of an existing file:
with open('example.txt', 'a') as file:
file.write('\nAppend this line.')4. Reading Lines into a List
To read a file line by line into a list:
with open('example.txt', 'r') as file:
lines = file.readlines()
print(lines)5. Iterating Over Each Line in a File
To process each line in a file:
with open('example.txt', 'r') as file:
for line in file:
print(line.strip())6. Checking If a File Exists
To check if a file exists before performing file operations:
import os
if os.path.exists('example.txt'):
print('File exists.')
else:
print('File does not exist.')7. Writing Lists to a File
To write each element of a list to a new line in a file:
lines = ['First line', 'Second line', 'Third line']
with open('example.txt', 'w') as file:
for line in lines:
file.write(f'{line}\n')8. Using With Blocks for Multiple Files
To work with multiple files simultaneously using with blocks:
with open('source.txt', 'r') as source, open('destination.txt', 'w') as destination:
content = source.read()
destination.write(content)9. Deleting a File
To safely delete a file if it exists:
import os
if os.path.exists('example.txt'):
os.remove('example.txt')
print('File deleted.')
else:
print('File does not exist.')10. Reading and Writing Binary Files
To read from and write to a file in binary mode (useful for images, videos, etc.):
# Reading a binary file
with open('image.jpg', 'rb') as file:
content = file.read()
# Writing to a binary file
with open('copy.jpg', 'wb') as file:
file.write(content)
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