5.6 Chapter summary
Highlights from this chapter include:
- A
whileloop runs a set of statements, known as the loop body, while a given condition, known as the loop expression, is true. - A
forloop can be used to iterate over elements of a container object. - A
rangefunction generates a sequence of integers between the two numbers given a step size. - A nested loop has one or more loops within the body of another loop.
- A
breakstatement is used within aforor awhileloop to allow the program execution to exit the loop once a given condition is triggered. - A
continuestatement allows for skipping the execution of the remainder of the loop without exiting the loop entirely. - A loop
elsestatement runs after the loop's execution is completed without being interrupted by abreakstatement.
At this point, you should be able to write programs with loop constructs. The programming practice below ties together most topics presented in the chapter.
| Function | Description |
|---|---|
range(end) | Generates a sequence beginning at 0 until end with step size of 1. |
range(start, end) | Generates a sequence beginning at start until end with step size of 1. |
range(start, end, s) | Generates a sequence beginning at start until end with the step size of s. |
| Loop constructs | Description |
while loop |
# initialization
while expression:
# loop body
# statements after the loop |
for loop |
# initialization
for loop_variable in container:
# loop body
# statements after the loop |
Nested while loop |
while outer_loop_expression:
# outer loop body (1)
while inner_loop_expression:
# inner loop body
# outer loop body (2)
# statements after the loop |
break statement |
# initialization
while loop_expression:
# loop body
if break_condition:
break
# remaining body of loop
# statements after the loop |
continue statement |
# initialization
while loop_expression:
# loop body
if continue_condition:
continue
# remaining body of loop
# statements after the loop |
Loop else statement |
# initialization
for loop_expression:
# loop body
if break_condition:
break
# remaining body of loop
else:
# loop else statement
# statements after the loop |
Adapted from Introduction to Python Programming by OpenStax (openstax.org), licensed under CC BY-NC-SA 4.0. Changes were made. License: CC-BY-NC-SA-4.0.