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. (Run this block to create the file for the remaining examples!)
Reading a File Using open()
Use the open() function to access file contents.
Example: Read Entire File
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
Using the with Statement (Recommended)
The with statement automatically closes the file after use.
Example
Closing Files Manually
If you do not use with, you must close the file manually.
Example
Reading a Specific Number of Characters
Example: Read First 8 Characters
Reading Files Line by Line
Read a Single Line
Read Multiple Lines
Loop Through All Lines (Best for Large Files)
- Efficient for large files
- Memory-friendly approach
