7 Cool Ways To Use F-Strings In Python

 

1. Align strings with f-strings:

You can use f-strings to align strings to the left, right, or center of a field. Here's an example:

name = "Alice"

age = 30

print(f"|{name:<10}|{age:^5}|")  # Output: |Alice     | 30  |

In this example, the < character aligns the name variable to the left of a 10-character field, and the ^ character centers the age variable in a 5-character field.

2. Use f-strings with dictionary variables:

You can use f-strings with dictionary variables to create dynamic strings. Here's an example:

person = {"name": "Alice", "age": 30}

print(f"My name is {person['name']} and I'm {person['age']} years old.")  # Output: My name is Alice and I'm 30 years old.

In this example, the person variable is a dictionary with keys "name" and "age". The f-string uses the values of these keys to create a dynamic string.

3. Use f-strings to format binary and hexadecimal numbers:

You can use f-strings to format binary and hexadecimal numbers. Here's an example:

x = 42

print(f"x = {x:b}")  # Output: x = 101010

print(f"x = {x:x}")  # Output: x = 2a

In this example, the :b format specifier formats the x variable as a binary number, and the :x format specifier formats the x variable as a hexadecimal number.

4. Use f-strings to format dates and times:

You can use f-strings to format dates and times. Here's an example:

import datetime

now = datetime.datetime.now()

print(f"Today is {now:%B %d, %Y}")  # Output: Today is April 29, 2023

In this example, the %B %d, %Y format specifier formats the now variable as a string in the format Month Day, Year.

5. Use f-strings to format currency values:

You can use f-strings to format currency values. Here's an example:

salary = 50000

print(f"My salary is ${salary:,}")  # Output: My salary is $50,000

In this example, the , character formats the salary variable as a string with comma separators.

6. Use f-strings with formatted strings:

You can use f-strings with formatted strings to create complex strings. Here's an example:

name = "Alice"

age = 30

message = f"My name is {name} and I'm {age} years old."

print(f"Message length: {len(message):<10}, Message: '{message:^20}'")

# Output: Message length: 32        , Message: 'My name is Alice and I'm 30 years old.'

In this example, the f-string uses another f-string to create a complex string that includes the length of the message variable and the message itself.

7.Use f-strings to format scientific notation:

You can use f-strings to format numbers in scientific notation. Here's an example:

x = 1234567890.123456789

print(f"x = {x:e}")  # Output: x = 1.234568e+09