How to make basic calculator python

  

def add(a,b):

total=a+b

print(total)

def sub(a,b):

total=a-b

print(total)

def mul(a,b):

total=a*b

print(total)

def div(a,b):

total=a/b

print(total)

print('press 1 addition')

print('press 2 subtraction')

print('Press 3 Multiplication')

print('press 4 division')

x=int(input("Press number :"))

if x==1:

no1=int(input("Enter value no1:"))

no2=int(input("Enter value no2 :"))

add(no1,no2)

elif x==2:

no1=int(input("Enter value no1 :"))

no2=int(input("Enter value no2 :"))

sub(no1,no2)

elif x==3:

no1=int(input("Enter value no1 :"))

no2=int(input("Enter value no2 :"))

mul(no1,no2)

elif x==4:

no1=int(input("Enter value no1 :"))

no2=int(input("Enter value no2 :"))

div(no1,no2)

else:

print('Error')