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Learn Python - Python tutorial - python for loop - Python examples - Python programs
- A for-loop (or simply for loop) is a control flow statement for specifying iteration, which allows code to be executed repeatedly.
Syntax:
for <variable> in <sequence>:
Explanation:
- Initially, the first value will be assigned in the variable.
- Secondly all the statements in the body of the loop are executed with the same value.
- Thirdly, once step second is completed then variable is assigned the next value in the sequence and step second is repeated.
- Finally, it continues till all the values in the sequence are assigned in the variable and processed.
Program to display table of Number:
num=2
for a in range (1,6):
print num * a
Output:
2
4
6
8
10
- Program to find sum of Natural numbers from 1 to 10.
sum=0
for n in range(1,11):
sum+=n
print sum
Output:
55 Nested Loops
- Loops defined within another Loop is called Nested Loop.
- When an outer loop contains an inner loop in its body it is called Nested Looping.
Syntax:
for <expression>:
for <expression>:
Body
eg:
for i in range(1,6):
for j in range (1,i+1):
print i,
print
Output:
>>>
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
>>>
Explanation:
- For each value of Outer loop the whole inner loop is executed.
- For each value of inner loop the Body is executed each time.
- Program to print Pyramid:
for i in range (1,6):
for j in range (5,i-1,-1):
print "*",
print
- Output:
>>>
* * * * *
* * * *
* * *
* *
*
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