How deeply does Python Workout, Second Edition cover variadic arguments?

Defines tuple collection and iteration, then contrasts variadic parameters with defaults and keyword arguments; it stops short of deeper call mechanics.

Variadic arguments

As explained in Python Workout, Second Edition

A variadic positional parameter collects an arbitrary number of positional arguments into a tuple.

Use a variadic positional parameter when a function should accept an unknown number of positional values. Python writes this parameter as *args; inside the function, args is a tuple. section 7.0 section 11.23

Reimplementing sum

A focused exercise is to write mysum(1, 2, 3) and mysum(10, 20, 30, 40, 50), adding the values without calling the built-in sum. Iterate over args rather than indexing it: the parameter is intended for an unknown number of values. section 2.6 section 7.3

Choose parameter types according to the function’s intended call pattern:

Use *args when callers may provide any number of positional values and the implementation will process them as a sequence, commonly with a for loop. section 7.3
Use a default parameter when a particular argument is optional and has a natural fallback, such as content=''. section 7.3
Use **kwargs for arbitrary name=value arguments; Python collects them separately in a dictionary rather than the positional tuple. section 7.0 section 7.3

How Python Workout, Second Edition covers it

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Also explained in

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Modern C, Third EditionA variadic parameter is the ellipsis-based parameter portion of a C function declaration that accepts additional arguments.
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Python How-Toargs is the conventional parameter name for a function parameter that collects a variable-length sequence of positional arguments.
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Modern CA variadic function is a C function that accepts a variable number of arguments through an ellipsis in its parameter list.
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100 Java Mistakes and How to Avoid Them
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Write Powerful Rust MacrosVariadic arguments are function-call arguments whose number is determined at the call site rather than fixed by the declaration.
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The Well-Grounded Python Developer: How the pros use Python and FlaskA variadic positional parameter is a function parameter that collects an arbitrary number of positional arguments.
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Go by ExampleA variadic function is a function that accepts a variable number of arguments through a variadic parameter represented inside the function as a slice.

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Related concepts

functionkind of · A function is a callable program unit that performs an operation, may accept inputs, and can produce a result or side effect.
variadic macroalternative to · A variadic macro is a function-like C preprocessor macro whose parameter list accepts a variable number of arguments through an ellipsis.
tupleproduces · A tuple is a finite, ordered collection of elements treated as a single composite value or record.
va_startuses · va_start is a C and C++ macro that initializes a variable argument list for accessing a function’s variable arguments.
splat operatorused by · A splat operator is language syntax that expands an iterable into multiple arguments or gathers multiple arguments into one parameter.
positional argumentuses · A positional argument is a function argument associated with a parameter according to its ordinal position in the call rather than its name.

This explainer was generated by Manning's knowledge graph from the text of Python Workout, Second Edition. The section links point to the parts of the book it draws on.