Nested loop
A nested loop is a loop placed inside another loop so that the inner loop executes within each iteration of the outer loop.
Get Programming: Learn to code with Python
A nested loop is a loop placed inside another loop so that its execution occurs within each iteration of the outer loop.
- How it is used
- Uses nested loops to test every letter of each candidate word against available Scrabble tiles.
- How deep it goes
- Explains outer and inner responsibilities, early exit, duplicate handling, remaining state, and the final completion check.
- Examples
- Demonstrates word candidates, individual letters, tile removal, duplicate letters, and words such as art, hue, and color.
- What you can do after
- Build it from scratch by translating a two-level checking process into pseudocode and executable loop logic.
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Learn AI-Assisted Python Programming, Second Edition
A nested loop is a loop whose body contains another loop, causing the inner loop to complete its iterations for each iteration of the outer loop.
- How it is used
- Processes every combination or every cell in row-and-column data.
- How deep it goes
- Explains execution order and list-of-lists traversal, but stops short of performance analysis.
- Examples
- Uses country pairs and an Olympic-medals list to demonstrate nested iteration.
- What you can do after
- Apply nested Python for loops to generate combinations and visit two-dimensional list values.
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Practices of the Python Pro
A nested loop is a loop construct placed inside the body of another loop, causing repeated iteration across multiple levels.
- How it is used
- Uses nested loops to identify quadratic growth while analyzing algorithm performance.
- How deep it goes
- Explains the repeated comparisons, early termination, and worst-case O(n²) behavior without extending into optimization techniques.
- Examples
- Demonstrates duplicate detection with Python loops over a sequence.
- What you can do after
- Evaluate nested-loop code by recognizing its potential quadratic worst-case running time.
Related concepts
- loopkind of · A loop is a programming control-flow construct that repeatedly executes a block of instructions according to an iteration rule or continuation condition.
- matrix-matrix multiplicationuses · Matrix multiplication combines compatible matrices to form a result whose entries are sums of products between rows of the first matrix and columns of the second.
- GPU kernelalternative to · A GPU kernel is an executable program or function that performs computation on a graphics processing unit, commonly using parallel threads.
- Cartesian productequivalent to · A Cartesian product is the set of all ordered tuples formed by selecting one element from each of multiple sets or sequences.
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