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# Python's range() Function Explained

One of Python’s built-in immutable sequence types is `range()`. This function is extensively used in loops to control the number of types loop have to run. In simple words range is used to generate a sequence between the given values.

The `range()` function can take 1 to 3 of the following arguments:

• Start: The integer value for the origin of the sequence, if not passed implicitly it's 0
• Stop:  The integer value up to which the sequence will get generated but won't include this number. This is a required argument which must be passed,
• Step: Establishes the difference between each iteration it can be positive or negative if not given the default step is 1

The order of arguments is as follows, `range(start, stop, step)`. Note that all parameters must be integers however they can be positive or negative.

## Using range() Function In Python

``````for i in range(0, 6, 1):
print(i)``````

Above for loop will print every number from 0 to 5 maintaining a constant difference 1.

Output:

``````0
1
2
3
4
5``````

It's worth mentioning that similar to list indexing in range starts from 0 which means `range( j )` will print sequence till `( j-1)` hence the output doesn't include 6.

As mentioned earlier the default value of start is 0 and for step it's 1, therefore the below code produces the same output.

``````for i in range(6):
print(i)``````

Output:

``````0
1
2
3
4
5``````

Generating a decreasing sequence is also possible by specifying a negative value to step argument.

``````for i in range(30,0,-5):
print(i)``````

Output:

``````30
25
20
15
10
5``````

Range function can also be used to iterate over the elements of a list.

``````li = ["1", "text", "2", "more Text",3,4,5]
for i in range(len(li)):
print(li[i])``````

Output:

``````1
text2
more Text
3
4
5``````

It's worth noting that in Python 2 the output of the range function was a list, but in python 3 the `range()` function doesn't produce a list so we can't perform list operation on it, but converting the output to a list is possible using the built-in `list()` method.

``````>>> x = list(range(6))
>>> x[0, 1, 2, 3, 4, 5]``````

PYTHON

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