Deep Chavda

Python f-strings (formatted string literals) provide a concise and readable way to format strings. Introduced in Python 3.6, they offer a powerful alternative to older formatting methods. In this guide, we'll explore their syntax, advanced formatting options, and best practices.

Basic Syntax

name = "Alice"
age = 25
print(f"My name is {name} and I am {age} years old.")
# Output: My name is Alice and I am 25 years old.

Formatting Numbers

pi = 3.1415926535
print(f"Pi rounded to 2 decimal places: {pi:.2f}")
# Output: Pi rounded to 2 decimal places: 3.14

large_number = 1000000
print(f"Formatted number: {large_number:,}")
# Output: Formatted number: 1,000,000

Using Expressions Inside f-Strings

a, b = 5, 3
print(f"The sum of {a} and {b} is {a + b}")
# Output: The sum of 5 and 3 is 8

String Alignment and Padding

name = "Python"
print(f"{name:<10}")  # Left-aligned
print(f"{name:>10}")  # Right-aligned
print(f"{name:^10}")  # Center-aligned

Debugging with `=`

x = 42
print(f"{x=}")
# Output: x=42

Best Practices

Use f-strings for clarity and readability.
Prefer f-strings over older formatting methods in Python 3.6+.
Be mindful of inline expressions—use variables for complex logic.

Conclusion

F-strings provide a powerful and efficient way to format strings in Python. Mastering their various formatting capabilities will improve your code's readability and maintainability.