How to pass string format as a variable to an f-string in python

How to pass string format as a variable to an f-string in python

In Python, you can pass a string format as a variable to an f-string by using a nested pair of curly braces. Here's an example:

format_string = "{:.2f}" value = 123.456 result = f"Formatted value: {value:{format_string}}" print(result)

In this example, the variable format_string holds the string format "{:.2f}", which specifies that the value should be formatted as a floating-point number with two decimal places. The nested curly braces within the f-string indicate that the format_string should be used to format the value variable.

When you run this code, it will print:

Formatted value: 123.46

This technique allows you to dynamically control the formatting of values in f-strings based on variables. Keep in mind that the inner curly braces are used to indicate the formatting specification and should be nested inside the outer curly braces of the f-string.

Examples

  1. "Python f-string variable string formatting example" Description: Learn how to use f-strings in Python to format string variables dynamically.

    # Example of passing string format as a variable to an f-string name = "John" age = 30 format_str = "My name is {name} and I am {age} years old." formatted_str = f"{format_str}" print(formatted_str)

  2. "Dynamic string formatting in Python using f-strings" Description: Explore how f-strings allow dynamic string formatting in Python.

    # Demonstrating dynamic string formatting with f-strings item = "apple" quantity = 5 formatted_str = f"I have {quantity} {item}s." print(formatted_str)

  3. "Python f-string with variable substitution example" Description: Understand how to substitute variables within f-strings in Python.

    # Illustration of f-string with variable substitution price = 10.5 quantity = 3 total = price * quantity result_str = f"The total cost of {quantity} items is ${total:.2f}." print(result_str)

  4. "Passing formatted string as a variable to f-string in Python" Description: Learn to pass pre-formatted strings as variables to f-strings in Python.

    # Passing pre-formatted string as a variable to f-string formatted_text = "Hello, {name}! You are {age} years old." name = "Alice" age = 25 output = f"{formatted_text}" print(output.format(name=name, age=age))

  5. "Python f-string with variable substitution tutorial" Description: Tutorial on utilizing variable substitution within f-strings in Python.

    # Tutorial demonstrating variable substitution in f-strings city = "New York" population = 8_500_000 info_str = f"{city} has a population of {population:,}." print(info_str)

  6. "Python f-string variable interpolation example" Description: Example demonstrating variable interpolation with f-strings in Python.

    # Example of variable interpolation using f-strings item = "book" price = 15.99 formatted_str = f"The {item} costs ${price:.2f}." print(formatted_str)

  7. "Using f-strings for string formatting in Python" Description: Explore how f-strings are utilized for string formatting in Python.

    # Example of string formatting with f-strings name = "Emma" greeting = f"Hello, {name}!" print(greeting)

  8. "Python f-string dynamic variable substitution" Description: Understand how to dynamically substitute variables within f-strings in Python.

    # Demonstrating dynamic variable substitution in f-strings profession = "engineer" experience_years = 5 output_str = f"I am an {profession} with {experience_years} years of experience." print(output_str)

  9. "How to pass formatted string as a variable to f-string" Description: Learn how to pass pre-formatted strings as variables to f-strings in Python.

    # Passing pre-formatted string as a variable to f-string formatted_greeting = "Hello, {name}!" name = "Michael" final_output = f"{formatted_greeting}" print(final_output.format(name=name))

  10. "Python f-string string interpolation example" Description: Example illustrating string interpolation using f-strings in Python.

    # Example of string interpolation with f-strings product = "computer" price = 1200 formatted_str = f"The {product} costs ${price:,.2f}." print(formatted_str)

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