Python subjective question for competitive exam (29)

Q1.Program to evaluate postfix expression.

op=['+','-','*','/']
s=[]
exp=[]
exp=input("enter expression")
for i in exp:
    if i not in op:
        s.append(i)
    else:
        a=int(s.pop())
        b=int(s.pop())
        if i=='+':
            c=a+b
        elif i=='-':
            c=a-b
        elif i=='*':
            c=a*b
        elif i=='/':
            c=a/b
s.append(c)
print(s)
        
Output
 >>> 
==================== RESTART: C:/Users/Dell/Desktop/ss.py ====================
enter expression23+
[5]       

Q2.program to find sum of n number.

n=int(input("enter number"))
s=n*(n+1)/2
print(s)

Output
>>> 
==================== RESTART: C:/Users/Dell/Desktop/ss.py ====================
enter number5
15.0                

Q3.program to list first element with last second element.

l=[1,2,3,4,5]
print("before swap")
print(l)
temp=l[0]
l[0]=l[-2]
l[-2]=temp
print("after swap")
print(l)

Output
>>> 
==================== RESTART: C:/Users/Dell/Desktop/ss.py ====================
before swap
[1, 2, 3, 4, 5]
after swap
[4, 2, 3, 1, 5]

Q4.Program to find area of rectangle.

def arearect(l,b):
    print(l*b)
arearect(2,3)

Output
>>> 
==================== RESTART: C:/Users/Dell/Desktop/ss.py ====================
6         

Q5.Program to find big between three number using nested if.

def big(a,b,c):
    if(a>b):
        if(a>c):
            print("a is big",a)
        else:
            print("c is big",c)
    else:
        if(b>c):
            print("b is big",b)
        else:
            print("c is big",c)
big(4,5,10)

Output
>>> 
==================== RESTART: C:/Users/Dell/Desktop/ss.py ====================
c is big 10
>>>