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12-File Handling

The document explains Python file handling, covering essential concepts such as file operations (open, read/write, close) and common modes. It details methods for reading from and writing to files, emphasizes the use of the 'with' statement for safe handling, and highlights common pitfalls like forgetting to close files and incorrect paths. Overall, it serves as a comprehensive guide to managing files in Python.

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7 views3 pages

12-File Handling

The document explains Python file handling, covering essential concepts such as file operations (open, read/write, close) and common modes. It details methods for reading from and writing to files, emphasizes the use of the 'with' statement for safe handling, and highlights common pitfalls like forgetting to close files and incorrect paths. Overall, it serves as a comprehensive guide to managing files in Python.

Uploaded by

researchwork.raja
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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File Handling:

🐍 Python File Handling Explained

File handling allows you to read from and write to files on your computer.
It’s essential for data persistence, configuration, logging, and more. Let’s
break it down step-by-step!

📜 Theory

1. What is a File?

o A file is a named location on disk to store related data


(e.g., .txt, .csv, .json).

2. File Operations:

o Open: Connect to a file.

o Read/Write: Access or modify the file’s content.

o Close: Release system resources.

3. Common Modes:

In addition you can specify if the file should be handled as binary or text
mode

📂 Opening a File

Use the open() function. Specify the file path and mode (read, write,
append, etc.).

Syntax:
📖 Reading from a File

Methods:

1. read(): Read the entire file as a string.

2. readline(): Read one line at a time.

3. readlines(): Read all lines into a list.

Example:

If the file is located in a different location, you will have to specify the file
path, like this:

You can return one line by using the readline() method:

✍️Writing to a File

Methods:

1. write(): Write a string to the file.

2. writelines(): Write a list of strings.


Example:

🛠️Using with for Safe Handling

The with statement automatically closes the file, even if errors occur.

Example:

💡 Binary File Handling

Read/write non-text files (e.g., images, videos).

Example:

🚫 Common Pitfalls

1. Forgetting to close files: Use with to avoid this.

2. Incorrect paths: Use absolute paths (e.g., C:/files/data.txt) or check


relative paths.

3. Overwriting files: Double-check modes (w vs a).

Key Takeaways

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