range() function
We can generate a sequence of numbers using range() function.
range(10) will generate numbers from 0 to 9 (10 numbers).
Syntax:
We can also define the start, stop and step size as
range(start,stop,step_size)
step_size defaults to 1 if not provided.
This function does not store all the values in memory, it would be inefficient. So it remembers the start, stop, step size, and generates the next number on the go.
Example:1
>>> range(10)
Output:
range(0, 10)
* In the above examples we have displayed only the range of numbers, not the numbers.
* In order to print the numbers in the given range we can use list sequence.
To force this function to output all the items, we can use the function list().
Example:2
Using range print number from 0 to 9
#it prints 0 to n-1
>>> print(list(range(10))) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Example:3
Using range print number from 0 to 10
Sol:
>>> print(list(range(10))) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Example:4
Using range print number from 0 to 14
Sol:
>>> print(list(range(15))) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14] >>>
Example:5
Using range print numbers from 0 to 20
Sol:
>>> print(list(range(21))) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
Example:6
print numbers from 1 to 10
Sol: (method:1)
>>> print(list(range(1,21))) [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] >>>
Example:7
print numbers from 1 to 10 (Using for loop)
Sol: (Method:2)
n=list(range(1,21))
for i in n:
print(i)
Output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 >>>
n=list(range(1,21))
for i in n:
print(i,end=' ')
Output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 >>>
Examples using start ,end and step options of range function
Example:8
print 1 to 20 in reverse
Sol:
print(list(range(20,0,-1)))
Example:9
print even numbers up to 20 (Method:1 )
Sol:
print(list(range(20,0,-2)))
Example:10
print even numbers upto 20 (Method:2 )
Sol:
n=list(range(2,21,2))
for i in n:
print(i,end=' ')
Output:
2 4 6 8 10 12 14 16 18 20 >>>
n=list(range(20,1,-1))
for i in n:
if(i%2==0):
print(i,end=' ')
Example:11
print even numbers up to 20 (Method:3 )
Sol:
n=list(range(1,21))
for i in n:
if(i%2==0):
print(i,end=' ')
Example:12
print even numbers up to 20 in reverse order (Method:1 )
Sol:
print(list(range(20,1,-2)))
Example:13
print even numbers up to 20 in reverse order (Method:2 )
Sol:
n=list(range(20,1,-2))
for i in n:
print(i,end=' ')
Example:14
print even numbers up to 20 in reverse order (Method:3 )
Sol:
n=list(range(20,1,-1))
for i in n:
if(i%2==0):
print(i,end=' ')
Example:15
print odd numbers up to 20 (Method:1 )
Sol:
print(list(range(1,20,2)))
Example:16
print odd numbers up to 20 (Method:2 )(Using for loop)
Sol:
n=list(range(1,20,2))
for i in n:
print(i,end=' ')
Example:17
print odd numbers up to 20 (Method:3 )
Sol:
n=list(range(1,20))
for i in n:
if(i%2==1):
print(i,end=' ')
Example:18
print odd numbers up to 20 in reverse order (Method:1 )
Sol:
print(list(range(19,0,-2)))
Example:19
print odd numbers up to 20 in reverse order (Method:2 )
Sol:
n=list(range(19,0,-2))
for i in n:
print(i,end=' ')
Example:20
print odd numbers up to 20 in reverse order (Method:3 )
Sol:
n=list(range(19,0,-1))
for i in n:
if(i%2==1):
print(i,end=' ')
