Python code part 2

 #WAP to find whether a given username contains less than 10 characters or not

username = input("Enter username:")

if  len(username) < 10:

print("\nusername is valid")

else:

print("\nusername is not valid")

# WAP to take input in list and find largest number in list

array_size=int(input("Enter array_size:"))

array=[]

for numbers in range(array_size):

values=input("Enter array elements:")

array.append(values)

print(array)

largest=array[0]

for next_number in array:

if largest<next_number:

largest=next_number

print("The largest in the array : ",largest)

#we check next_number2 in array then check condition if next_number2 is less than smallest then the next_number2 becomes the smallest which is done in the next step

smallest=array[0]

for next_number2 in array:

if smallest > next_number2:

smallest=next_number2

print("The smallest in the array:",smallest)

OUTPUT:

Enter array_size:4

Enter array elements:2

Enter array elements:9

Enter array elements:8

Enter array elements:3

['2', '9', '8', '3']

The largest in the array :  9

The smallest in the array: 2

##WAP for exchanging the start and the end character of a string

string=input("Enter string for exchanging the start and the end character of a string:")

if len(string)==1:

print(string)

else:

result=string[-1:]+string[1:-1]+string[0:1]

print(result)

OUTPUT:

Enter string for exchanging the start and the end character of a string:PYTHON

NYTHOP

##WAP List Overlap Common between two  lists

list1=[]

list2=[]

n_list1=int(input("Enter number of elements in list1:"))

for n1 in range(n_list1):

elements1=int(input("Enter list1 elements:"))

list1.append(elements1)

n_list2=int(input("Enter number of elements in list2:"))

for n2 in range(n_list2):

elements2=int(input("Enter list2 elements:"))

list2.append(elements2)

print("List1 elements-->",list1)

print("List2 elements-->",list2)

print("Common element list-->",list(set(list1).intersection(list2)))

OUTPUT:

Enter number of elements in list1:3

Enter list1 elements:1

Enter list1 elements:2

Enter list1 elements:3

Enter number of elements in list2:5

Enter list2 elements:2

Enter list2 elements:3

Enter list2 elements:4

Enter list2 elements:5

Enter list2 elements:6

List1 elements--> [1, 2, 3]

List2 elements--> [2, 3, 4, 5, 6]

Common element list--> [2, 3]

##WAP that takes a list of numbers and makes a new list of only the first and last elements of the given list.

a_list=[]

no_of_elements=int(input("Enter number of elements in list2:"))

for n2 in range(no_of_elements):

elements=int(input("Enter list elements:"))

a_list.append(elements)

def list_ends(a_list):

return [a_list[0], a_list[-1]]

print(list_ends(a_list))

OUTPUT:

Enter number of elements in list2:5

Enter list elements:1

Enter list elements:2

Enter list elements:5

Enter list elements:6

Enter list elements:7

[1, 7]

##WAP to find sum of first n natural numbers

def sum(number):

if number<=0:

return number

else:

return sum(number-1)+number

number=int(input("Enter  number until where you want to find some:"))

if number<0:

print("Enter +ve number:")

else:

print("Sum of  first", number," numbers in natural number series is", sum(number))

OUTPUT:

Enter  number until where you want to find some:6

Sum of  first 6  numbers in natural number series is 21