WEBVTT

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File Handling in Python

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In this video, we will understand file handling in Python using read, write, and append modes.

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Practice reading file contents using Python's open function.

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Apply file handling to manage library records.

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File handling is the process of creating, reading, writing, and updating files using a programming language.

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In Python, file handling enables programs to store and retrieve data permanently.

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It supports different modes, read, opens a file for reading, write, creates or overrides a file, append,

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adds new data without erasing existing content.

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This is useful for managing records, logs, and structured data.

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Read mode

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If you want to read and display the file content, you can use the read mode like this.

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The open function opens library records.txt in read mode, which means the file must exist.

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Otherwise, an error will occur.

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The read method retrieves the entire content of the file as a string.

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The print function outputs the file content to the console.

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The width statement ensures the file is properly closed after reading, preventing memory leaks.

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This function helps retrieve stored library records, visitor details, and any new visitor entries.

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Write mode

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The function save library records opens the file, library records.txt in write mode.

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This mode overrides any existing content.

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It writes book inventories and visitor details to the file.

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If the file does not exist, it creates a new one.

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Append mode

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The function append visitor entry opens the file in append mode.

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Instead of overwriting, it adds new visitor details to the file.

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If the file does not exist, Python creates it automatically.

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Displaying result

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The output of this program consists of two parts, console output.

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When the program runs, it prints messages confirming that data has been saved and updated.

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File output

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A file named library records.txt is created or overwritten if it already exists.

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It contains

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The library book inventories and visitor details are saved first, followed by new visitor entries added in append mode.

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This program demonstrates file handling by storing library records, including book inventories and visitor details, using write and append modes.

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It also allows reading stored data for reference.