Напишу про калькулятор
#Калькулятор
a = float(input("Enter number: "))
b = float(input("Enter number: "))
znak = input("Выберите операцию: +, -, *, / ")
if znak == "+":
c = a + b
print("Answer: " + str(c))
elif znak == "-":
c = a - b
print("Answer: " + str(c))
elif znak == "*":
c = a * b
print("Answer: " + str(c))
elif znak == "/":
c = a / b
print("Answer: " + str(c))
else:
print("Error!")
exit()
