Python

WeirdPythonBug.py

first = float(input("first number"))
operand = input("Your operand (accepting addition, multiplication, division, subtraction)")
second = float(input("second number"))

if operand == "x" or operand == "multiplication" or operand == "multiply" or operand == "*":
    print(first * second)
elif operand == "+" or operand == "addition" or operand == "add":
    print(first + second)
elif operand == "-" or operand == "subtraction" or operand == "subtract":
    print(first - second)
elif operand == "/" or operand == "division" or operand == "divide":
    print(first / second)

count = [1, 3, 4]
count += 3, 4, 5
print(count)

'''
(base) scottlydon@Scotts-MacBook-Air python % Python calculator.py
first number39
Your operand (accepting addition, multiplication, division, subtraction)addition
Traceback (most recent call last):
  File "calculator.py", line 2, in <module>
    operand = input("Your operand (accepting addition, multiplication, division, subtraction)")
  File "<string>", line 1, in <module>
NameError: name 'addition' is not defined
'''

I know that "addition" is not defined. It is a user inputted value.