Enumerate
enumerate is an iteration utility that yields pairs containing sequential indices and corresponding items from an iterable, optionally starting at a specified index.
Python How-To
The enumerate function is a Python built-in function that returns an iterator producing position-and-item pairs from an iterable.
- How it is used
- Improves for-loop iteration when each item must be displayed or processed with its position.
- How deep it goes
- Explains iterator creation, yielded tuples, default counters, start values, and tuple unpacking through worked loops.
- Examples
- Demonstrates numbered prime numbers and formatted task records using zero-based and one-based counters.
- What you can do after
- Apply it via Python's built-in enumerate function to write readable position-aware loops.
Python Workout, Second Edition
The enumerate function returns an iterator that yields pairs containing sequential indices and values from an iterable.
- How it is used
- Uses indexed iteration to solve loops that need positions alongside values, especially when processing strings.
- How deep it goes
- Explains returned pairs, unpacking, default indexing, and custom starts; connects iterator behavior to broader protocol study.
- Examples
- Demonstrates indexed alphabet output, hexadecimal digit processing, and alphabet-to-number dictionary construction.
- What you can do after
- Apply it via Python's built-in iterator to write concise loops and comprehensions that retain both positions and values.
Read how Python Workout, Second Edition explains enumerate →
Tiny Python Projects: Learn coding and testing with puzzles and games
enumerate() is a Python built-in function that produces pairs of indexes and values while iterating an iterable.
- How it is used
- Uses index-and-value iteration to format a Tic-Tac-Toe board and label empty cells.
- How deep it goes
- Defines returned pairs, default and custom starts, laziness, unpacking, and equivalent loop and comprehension forms.
- Examples
- Demonstrates board strings, REPL enumeration, numbered cells, and a tested format_board() function.
- What you can do after
- Apply it via Python to iterate values alongside positions and format indexed output.
Read how Tiny Python Projects: Learn coding and testing with puzzles and games explains enumerate →
Related concepts
- iterableuses · An iterable is an object or value that provides or supports a protocol for producing its elements sequentially.
- tupleproduces · A tuple is a finite, ordered collection of elements treated as a single composite value or record.
- tuple unpackingused by · Tuple unpacking is assigning the elements of an iterable to multiple corresponding targets in a single operation.
- collectused by · collect is an operation that consumes produced values and gathers them into a collection or other result.
- indexingproduces · Indexing is the organization or use of positions, keys, or lookup structures to identify and retrieve selected data or elements.
- iteratoruses · An iterator is an object or abstraction that provides successive values from a sequence or data source through a traversal protocol.
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