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Hello programmers.

I am trying to figure out what is going on in this program, and I have a few questions.

def number_input(question):
answer = input(question)
number = int(answer)
return number

a = number_input('Write a!')
b = number_input('Write b!')
print('a + b =', a + b)

1. I define a function. Why is there an underscore between (number_input)?