Simple Calculator

def add(x,y):
  return x+y
def subtract(x,y):
  return x-y
def multiply(x,y):
  return x*y
def divide(x,y):
  return x/y

print('Select Operation:')
print('1.Add')
print('2.Subtract')
print('3.Multiply')
print('4.Divide')

while True:
  choice = input('\nEnter Choice(1/2/3/4): ')
  if choice in ('1','2','3','4'):
    try:
      num1 = float(input('Enter first number: '))
      num2 = float(input('Enter second number: '))
    except ValueError:
      print('Error! Please enter the number')
      continue

    if choice == '1':
      print(num1,'+',num2,'=',add(num1,num2))
    elif choice == '2':
      print(num1,'-',num2,'=',subtract(num1,num2))
    elif choice == '3':
      print(num1,'*',num2,'=',multiply(num1,num2))
    elif choice == '4':
      print(num1,'/',num2,'=',divide(num1,num2))

    next_calculation = input('\nLets d9o next calculation(yes/no): ')
    if next_calculation == 'no':
      break

  else:
    print('You have typed wrong input.\nTry to press 1 to 4.\n')