Opening Files in Python

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Opening Files in Python

Python allows you to read files stored on your system using built-in functions. Files can be opened from the same directory or from another location using a full path.

Example File Structure

Assume a file named sample.txt exists in the same directory.

Hello there! This file is created to demonstrate file reading. Have a great day!

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Reading a File Using open()

Use the open() function to access file contents.

Example: Read Entire File

file_data = open("sample.txt", "r") print(file_data.read()) file_data.close()

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The read() method loads the entire file content into memory.

Opening Files from Another Location

Provide a full file path if the file is outside your current directory.

Example: Using Absolute Path

file_data = open("C:/data/files/message.txt", "r") print(file_data.read()) file_data.close()

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Using the with Statement (Recommended)

The with statement automatically closes the file after use.

Example

with open("sample.txt", "r") as file_data: print(file_data.read())

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Closing Files Manually

If you do not use with, you must close the file manually.

Example

file_data = open("sample.txt", "r") print(file_data.readline()) file_data.close()

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Reading a Specific Number of Characters

Example: Read First 8 Characters

with open("sample.txt", "r") as file_data: print(file_data.read(8))

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Reading Files Line by Line

Read a Single Line

with open("sample.txt", "r") as file_data: print(file_data.readline())

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Read Multiple Lines

with open("sample.txt", "r") as file_data: print(file_data.readline()) print(file_data.readline())

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Loop Through All Lines (Best for Large Files)

with open("sample.txt", "r") as file_data: for line in file_data: print(line.strip())

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• Efficient for large files
• Memory-friendly approach

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