F-string
An f-string is a Python formatted string literal that evaluates embedded expressions and inserts their formatted values into the resulting string.
Python How-To
An f-string is a string literal syntax that evaluates embedded expressions and formats their values within the string.
- How it is used
- Creates readable string output by interpolating variables and expressions and formatting their displayed values.
- How deep it goes
- Works through interpolation, expressions, alignment, numeric specifiers, and escaping braces, while cautioning against complicated embedded expressions.
- Examples
- Uses task labels, aligned task records, formatted numbers, and a price tag requiring literal curly braces.
- What you can do after
- Build it from scratch: produce readable Python output with embedded values, appropriate format specifiers, and literal braces when needed.
Tiny Python Projects: Learn coding and testing with puzzles and games
An f-string is a Python string literal that evaluates expressions enclosed in braces and inserts their values into the resulting string.
- How it is used
- Uses f-strings to construct readable output from variables and expressions in small Python programs.
- How deep it goes
- Explains placeholders, expression interpolation, readability, and width formatting, but does not descend into implementation internals.
- Examples
- Demonstrates nautical phrases, file-count columns, picnic output, and randomly generated insults.
- What you can do after
- Apply f-strings to generate readable output containing variables, expressions, and controlled-width values.
Read how Tiny Python Projects: Learn coding and testing with puzzles and games explains f-string →
Python Workout: 50 ten-minute exercises
A Python string literal prefixed with f that evaluates embedded expressions and supports format specifications.
- How it is used
- Formats readable output by combining literal text, variables, expressions, and presentation rules.
- How deep it goes
- Explains interpolation, expressions, alignment, and numeric precision, while deferring the full formatting-code reference.
- Examples
- Uses greetings, computed expressions, aligned names, and a floating-point value displayed with two decimal places.
- What you can do after
- Apply it via Python to produce mixed-value output and control numeric or textual presentation.
Read how Python Workout: 50 ten-minute exercises explains f-string →
Python Workout, Second Edition
An f-string is a Python string literal that evaluates embedded expressions and formats their values into the resulting string.
- How it is used
- Combines literal text with variables, numbers, and evaluated expressions for readable program output.
- How deep it goes
- Defines interpolation, expression evaluation, and formatting specifications while contrasting older formatting methods.
- Examples
- Uses greeting output, arithmetic, capitalization, mixed numeric output, and aligned names as examples.
- What you can do after
- Apply it via Python f-string syntax to produce formatted output without separately passing formatting arguments.
Related concepts
- format methodalternative to · A format method is an API operation that produces a formatted representation by substituting supplied values into a formatting specification.
- interpolationimplements · Interpolation is the construction of text by inserting evaluated values or expressions into designated placeholders in a string or template.
- joinalternative to · Python's str.join method returns a string formed by concatenating an iterable's strings with the calling string between adjacent elements.
- expressionuses · An expression is a syntactic construct in a programming language that evaluates to a value or designates an object, and may also cause side effects.
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