Lecture 39:- range() In Python

In Python, the range() function is used to generate a sequence of numbers. It is commonly used with for loops to iterate over a specific range of numbers. The range() function can take up to three arguments:

1. start: The starting value of the sequence (inclusive). If not specified, the default value is 0.
2. stop: The ending value of the sequence (exclusive). The sequence will generate numbers up to, but not including, this value.
3. step: The increment between each number in the sequence. If not specified, the default value is 1.

The syntax for the range() function is as follows:

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range([start], stop, [step])

Here are some examples of using the range() function:

Example 1: Generating a sequence of numbers from 0 to 4 (exclusive):

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for num in range(5):    print(num)

Output:

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0 1 2 3 4

Example 2: Generating a sequence of even numbers from 0 to 10 (exclusive):

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for num in range(0, 10, 2):    print(num)

Output:

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0 2 4 6 8

Example 3: Generating a sequence of numbers in reverse order from 10 to 1 (exclusive):

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for num in range(10, 0, -1):    print(num)

Output:

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10 9 8 7 6 5 4 3 2 1

In each example, the range() function is used to generate a sequence of numbers based on the specified arguments, and then the for loop iterates over the generated sequence to print each number. The range() function is a useful tool for creating number sequences and controlling the iteration of loops in Python.