Python String replace() Method

The replace() method in Python is used to replace a specified substring with another substring within a string. It creates a new string with the replacement since strings in Python are immutable.

Syntax

• old: The substring to be replaced.
• new: The substring to replace old.
• count (optional): The number of occurrences to replace. If omitted, all occurrences will be replaced.

Examples

1. Replace All Occurrences

Output:

2. Replace Limited Occurrences

Output:

3. Case-Sensitive Replacement

The replace() method is case-sensitive, so it differentiates between uppercase and lowercase.

Output:

4. Replacing Spaces or Special Characters

Output:

5. Using replace() with Empty String

You can remove a substring by replacing it with an empty string.

Output:

Key Points

1. Immutability: The replace() method doesn’t modify the original string; it returns a new string.
2. Case-Sensitivity: Matches are case-sensitive.
3. Efficient for Replacements: Suitable for replacing specific substrings.

Common Use Cases

• Replacing specific words in a document.
• Formatting strings (e.g., replacing spaces with underscores).
• Removing unwanted characters from a string.

The replace() method is versatile and frequently used for text manipulation in Python.