Python File I/O Basics: open(), read(), write() Made Simple

Python File I/O Basics: open(), read(), write() Made Simple 📄

File input and output (I/O) operations are essential skills for any developer. In Python, you can easily open, read, and write files using the open(), read(), and write() functions.

Python File IO icon

✅ Opening and Reading a File

Use open() with mode 'r' (read) to read the contents of a file easily.

# Opening and reading a file
with open('sample.txt', 'r', encoding='utf-8') as file:
    content = file.read()
    print(content)

✅ Writing to a File

Set the mode to 'w' to overwrite or create a new file and write data into it.

# Opening and writing to a file
with open('output.txt', 'w', encoding='utf-8') as file:
    file.write("Hello, Python file I/O!")

✅ Reading Line by Line

For large files, reading line by line using a for loop is memory-efficient and clean.

# Reading a file line by line
with open('sample.txt', 'r', encoding='utf-8') as file:
    for line in file:
        print(line.strip())

Using a with block ensures the file is properly closed after the operation, avoiding resource leaks. File I/O is a fundamental building block for logging, configuration management, and handling external data.

Handling files is the first step to handling real-world data. Master the basics, and the rest will come naturally. Keep building, keep growing — you're on the right track! 🚀

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