Python tutorial- for loop


Python Loops


Loops are statements that can execute a block of code again and again while the condition is true.

For Loop

You can use for statement to generate a loop with a specific need. For example, you might want to use for loop to execute a block of code for each item of a list. > >>lst1=[1,2,3,4,5]
>>> for i in lst1:
            print i,
1 2 3 4 5
>>> 
For example, let’s write a program to generate a multiplication table as shown below: 1*1=1          2*1=2                   3*1=3         ……  9*1=1 1+2=2         2*2=4                   3*2=6          ……  9*2=18 …….           …….                   …….           ……  …….

1*9=9         2*8=18                 3*9=27         ……  9*9=81
 
lst1=range(1,10)
lst2=range(1,10)
for i in lst1:
        for j in lst2:
                print  j,'*',i,'=',i*j,'  ',
        print '\n'
 
Note: we use range() method to generate a list of  range values. If you want to generate a list of 9 integer numbers from 1 to 9, you will write range(1,10). If you want to generate a list in which every its element increases by a fixed number other than 1, you can specify the loop step number (third argument) in the range method. The Python code below displays a list of odd numbers

from 1 to 10:
>>>for i in range(1,10,2) # step=2
              print "%d" %i


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