Teach Yourself VISUALLY Python by Hart-Davis Ted;Hart-Davis Guy; & Ted Hart-Davis

Author:Hart-Davis, Ted;Hart-Davis, Guy; & Ted Hart-Davis [Hart-Davis, Guy & Hart-Davis, Ted]
Language: eng
Format: epub
Publisher: John Wiley & Sons, Incorporated
Published: 2022-07-27T00:00:00+00:00

Using the range() Function to Create a Numeric for Loop

When you need to loop through a sequence of nonsequential numbers, you can put them in a set and loop through the set. For example, the following for loop works through the numbers 4, 7, and 11 in a set:

for num in (4, 7, 11):

print(num)

This approach works fine, and you can use it for sequential numbers as well if you want — for example, for num in (1, 2, 3). But when you have many sequential numbers, using Python’s range() function is a better solution.

In the following example, the first line creates the variable r1 and uses the range() function to assign to it a range of 20 items. The second line creates the variable num and uses it in a for loop that iterates through r1. The third line, indented four spaces as usual, simply prints the current value of num.

r1 = range(20)

for num in r1:

print(num)

This example outputs 20 numbers, starting with 0 and ending with 19.

0

1

…

19

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