Python for loop | python range() function | python nested for loop | CBSE | for loop with examples
In this Python tutorial for beginners, we will learn for loop in python. This Python tutorial video covers: syntax of for loop in python, examples of for loop in python, nested for loop with example, python range() function with examples and important points for range function.
We have also discussed range function with a single parameter, range function with two parameters and range function with three parameters.
What is for loop?
The for loop in Python is used to process the items of a sequence, such as a list, a tuple, a string, a dictionary, or a set.
A for loop repeats its loop body for each element of the sequence, in order. When it reaches the end of the sequence, the loop ends.
Syntax:
for variable in sequence :
statement(s)
The general form of the for loop is:
• The for keyword
• A variable name
• The in keyword
• A sequence (that is either a list, a string, a tuple, dictionary, or a set.).
• A colon
• Starting on the next line, an indented block of code (called the for clause or body of the for loop )
The range function:
The range() function returns a sequence of numbers.
Syntax :
range(start, stop, step)
start : An integer number indicating the starting point. By default, it is 0. This parameter is optional.
stop : An integer number indicating the stopping point. But not including the number you gave it.
step : An integer number to specify the increment value. By default, it is 1. This parameter is optional.
Nested loop:
A loop may contain another loop in its body. This form of loop is called a nested loop.
The inner loop of a nested loop must terminate before the outer loop.
For each iteration of the "outer loop," the "inner loop" will be executed once.
Important points for range():
The step value must not be zero. If step parameter is zero, ValueError is raised.
The arguments to the range() function must be integers. We cannot use floating-point or non-integer numbers in any of its arguments.
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