Python programming language provides the following types of loops to handle looping requirements. Python provides three ways for executing the loops. While all the ways provide similar basic functionality, they differ in their syntax and condition checking time.
for variable in sequence: # code block to be executed
Here, variable
is a variable that takes on the value of each element in the sequence, one at a time. The code block below the for
statement is executed for each element in the sequence.
For example, let's say we have a list of numbers and we want to print each number in the list:
numbers = [1, 2, 3, 4, 5] for num in numbers: print(num)
This will output:
1 2 3 4 5
The while
loop is used to repeatedly execute a block of code as long as a certain condition is true. Here's the basic syntax for a while
loop:
while condition: # code block to be executed
Here, condition
is a boolean expression that is evaluated before each iteration of the loop. If the condition is True
, the code block below the while
statement is executed. This continues until the condition becomes False
.
For example, let's say we want to print the numbers from 1 to 5 using a while
loop:
num = 1 while num <= 5: print(num) num += 1
This will output:
1 2 3 4 5
In this example, we initialize the variable num
to 1 before the loop. The condition num <= 5
is evaluated before each iteration of the loop. Inside the loop, we print the current value of num
and then increment it by 1 with the line num += 1
. The loop continues until num
is no longer less than or equal to 5.
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