List

a = [ ” Chandru ” , 1 , 456 , ” Python ” ]

List is a collection of the datatypes. The value denote the index 0, such that when we print the value a[0], it will gives the output as Chandru. Similarly when we print a[3], it will give the output as 456.

If we give the negative sign it will access the list in the backwise order.

So that when we print a[-1], it will give the output as “Python”. We can aslo search whether the word is present in the list.

>>> ” Chandru ” in a

True

>>> ” Linux ” in a

False

Program to print Power series

To write a program that prints series of 1+x/1+x**2/2!…+x**n/n.

n = int(input( ” Enter the number ” )

sum = term = n = 1

while n < 100:

term *= x / n

sum += term

n = n+1

if sum < 0:

break

print( ” Sum is = %d ” % sum )

When we execute this, the output will be

Enter the number 0

Sum is = 1

For loop

For loop in Python is not same as in c. It will automatically increment the value which is in the range.

a = [ ” Python ” , ” is ” , ” easy’ ]

for i in a:

print(i)

When we execute this program, first it will print the value ” Python ” which has the index 0 and followed by the next index. Similarly we can fix some range in which the for loop has to be executed.

Program to print Asterisk symbol in tringle manner :-

row = int(input(” Enter the number of rows “))

while row >=0:

print( “*” * row)

row = row – 1

The output of this program will be

Enter the number of rows 5

*****

****

***

**

*