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Python example: f-strings

Last modified: April 1, 2021

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FAQ

What are f-strings in Python?

f-strings are a feature introduced in Python 3.6 that allow you to embed expressions inside string literals using {} placeholders. The expressions are evaluated at runtime and the results are inserted into the string.

How do I create an f-string?

To create an f-string, you prefix the string with the letter 'f' and then place expressions inside curly braces {}. For example, f'The answer is {2 + 2}'

Can I use f-strings with variables?

Yes, you can use f-strings to embed variables inside a string. For example, name = 'Alice' f'My name is {name}'

Can I use f-strings with functions?

Yes, you can use f-strings to call functions and embed their return values inside a string. For example, f'The result is {len('hello')}'

Can I format the output of f-strings?

Yes, you can use format specifiers inside the curly braces {} to format the output of expressions. For example, f'The result is {2/3:.2f}'

Are f-strings faster than other string formatting methods?

Yes, f-strings are generally faster than other string formatting methods because they are evaluated at runtime instead of being pre-compiled.

Can I use f-strings in older versions of Python?

No, f-strings were introduced in Python 3.6 and are not available in older versions of Python.

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