Strings in Python

Master string handling in Python: single-line/multi-line strings, f-strings, indexing, traversal, searching, slicing, comparison, replacing, Unicode conversions, and more.

Creating Strings

A string is a sequence of characters. In Python, strings can be created using single quotes, double quotes, or triple quotes for multi-line strings.

1. Single Line Strings

Single-line strings can use single or double quotes.

2. Multi-line Strings

Use triple quotes for multi-line strings.

3. f-Strings (String Interpolation)

Insert variables inside strings using f-strings.

String Basics (Indexing, Length, Traversal)

Strings behave like sequences. You can access characters using indexes and get length using len().

1. Access Character by Index

Use str[index]. Index starts from 0.

2. Getting String Length

Use len() to get number of characters.

3. Traversing Through a String

Loop through each character using for loop.

Formatted Output

You can align text for tables using string methods like ljust() and rjust().

1. Formatted Table Output

Align columns like a table.

Comparing & Concatenating Strings

Strings can be compared using == and joined using + or f-strings.

1. Comparing Strings

Use == for equality.

2. Concatenating Strings

Use + or f-strings.

String Transformations

Transformations modify or process string values.

1. Reverse a String

Use slicing.

2. Change Case

Use upper() and lower().

3. Repeat a String

Use multiplication operator.

Unicode Conversions

Python uses Unicode. Use ord() and chr() for conversions.

1. Character to Code

Use ord().

2. Code to Character

Use chr().

Slicing, Splitting & Trimming

These operations are common in parsing and validation.

1. Slicing

Use string slicing syntax.

2. Split String

Use split().

3. Trimming Whitespace

Use strip(), lstrip(), rstrip(). Pipes (|) in the output show where the string starts and ends so you can see the effect of trimming.

Searching & Replacing

Use in, find(), and replace() for searching and replacing.

1. Check if String Contains Substring

Use "in" operator.

2. Replace Text

Use replace().

3. Find Index of Substring

Use find().

4. Startswith & Endswith

Check prefix and suffix.