How can I use Python s range function

Question

I have a set of numbers and I don't want to print all the numbers separateley.How does python's range function can help me?

Answer 1

You can use a range function whenever you want to run a piece of code more than once. You can use "for" loop. Look at the below example:

fruits = ['Banana', 'Apple',  'Grapes']

for index in range(len(fruits)):

   print (fruits[index])

Notice here, we have specified the range, that means we know the number of times the code block will be executed.

Output:

Banana

Apple

Grapes

Answer 2

The range function is mostly used in for-loop. 

Ex:

for i in range(0,5):

    print(i)

The output will be:

0

1

2

3

4

Note: When you use the range() function, the 2nd parameter is excluded in the range.

Answer 3

range(x) returns a list of numbers from 0 to x - 1.

>>> range(1)
[0]
>>> range(2)
[0, 1]
>>> range(3)
[0, 1, 2]
>>> range(4)
[0, 1, 2, 3]

for i in range(x): executes the body (which is print i in your first example) once for each element in the list returned by range(). i is used inside the body to refer to the “current” item of the list. In that case, i refers to an integer, but it could be of any type, depending on the objet on which you loop.

Answer 4

>>> range(1,10)
[1, 2, 3, 4, 5, 6, 7, 8, 9]

Answer 5

# You can use range() wherever you would use a list. 

a = range(1, 10) 
for i in a: 
    print i 

for a in range(21,-1,-2):
   print a

#output>> 21 19 17 15 13 11 9 7 5 3 1

Answer 6

# We can use any size of step (here 2)
>>> range(0,20,2)
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]

>>> range(20,0,-2)
[20, 18, 16, 14, 12, 10, 8, 6, 4, 2]

Answer 7

# The sequence will start at 0 by default. 
#If we only give one number for a range this replaces the end of range value.
>>> range(10)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Answer 8

# If we give floats these will first be reduced to integers. 
>>> range(-3.5,9.8)
[-3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]