Python 14, simple project

 bot_name : str = 'Bob'

print(f'Hello I\'m {bot_name} ! How can I assist you today?')

while True:

    user_input: str = input('You : ').lower()

    if user_input in ['hi', 'hello']:

        print(f'{bot_name}: Hi there ! how can i help you')

    elif user_input in ['bye', 'see you']:

        print(f'{bot_name}: Good bye have a great day')

    elif user_input in ['+', 'add']:

        print(f'{bot_name}: Sure ! let do some addition ! Please enter two number')

        try:

            num1: float = float(input('FirstNumber :' ))

            num2: float = float(input('SecondNumber :' ))

            print(f'{bot_name}: The sum is {num1+num2 }')

        except ValueError:

            print(f'{bot_name}: Oopss! That doesn\'t a valid number. Try again')

    else:

        print(f'{bot_name}: I\'m sorry, I don\'t understand that. Please try again.')

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