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Looping Statements In Python


Looping Statements are used to execute a statement several number of times based on the condition.In Python language these are classified into following types.
1.For Loop
2.While Loop

for:
'for' is a keyword in python language which is used to execute one block of statements several number of times based on the condition.
Syntax
for variable in range('starting value','ending value','increment/decrement'):
        ...
        ...
        ...
In the above syntax :
increment/decrement is incrementation(+1) or decrementation(-1)

Key Points

  • What is For Loop
  • What is While Loop
  • What is Do While Loop

Image

For Loop Programs


Key Points

  • What is For Loop

Image
Display 1 to 10 Values Using For Loop 



def myfun():
    for x in range(1,10+1,1):
        print(x)

    
if __name__=="__main__":
    myfun()
Output:
1
2
3
4
5
6
7
8
9
10

Display 10 to 1 Values Using For Loop 


def myfun():
    for x in range(10,0,-1):
        print(x)

    
if __name__=="__main__":
    myfun()
Output:
10
9
8
7
6
5
4
3
2
1

Nested For Loop In Python


Nested For Loop :
One for loop within another for loop is knows as Nested For Loop Syntax

for variable in range('starting value','ending value','increment/decrement'):
        for variable in range('starting value','ending value','increment/decrement'):
                ...
                ...
                ...
        ...
        ...
        ...
In the above syntax :
Outer loop is Row
Inner loop is Column

Key Points

  • What is For Loop
  • What is While Loop
  • What is Do While Loop

Image
***
***
***
***
***
***


def myfun():
    for x in range(1,7,1):
        for y in range(1,4,1):
            print("*",end="")
            
        print(end="\n")

    
    
if __name__=="__main__":
    myfun()
Output:
***
***
***
***
***
***

*
**
***
****
*****
******


def myfun():
    for x in range(1,7,1):
        for y in range(1,x+1,1):
            print("*",end="")
            
        print(end="\n")

    
    
if __name__=="__main__":
    myfun()
Output:
*
**
***
****
*****
******

******
*****
****
***
**
*



Row Decrement column increment
******
*****
****
***
**
*


def myfun():
    for x in range(6,0,-1):
        for y in range(1,x+1,1):
            print("*",end="")
            
        print(end="\n")

    
    
if __name__=="__main__":
    myfun()

...........................

Column Decrement row increment
******
*****
****
***
**
*

def myfun():
    for x in range(1,7,1):
        for y in range(6,x-1,-1):
            print("*",end="")
            
        print(end="\n")

    
    
if __name__=="__main__":
    myfun()
Output:
******
*****
****
***
**
*