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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.
range() function can take 1 to 3 of the following arguments:
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.
Let's start with generating a simple series and printing it out
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.
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)
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)
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])
1 text 2 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
>>> x = list(range(6)) >>> x [0, 1, 2, 3, 4, 5]
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