My students want to use input () inside a function. Here is a sample student code, this is a simple calculator:

def calc():
    while(True):
        req=input(": ")
        if req=="":
            break
        print(req "=" str(eval(req)))

calc()

I always thought that this is not done. Or I'm wrong? Please help me figure it out. And if this is not done, please explain why

PS.we don't talk about return, just about using the input in the body of a function

CodePudding user response：

Yes, you can put input calls inside a function body. It makes your function impure, which is not ideal from a functional programming point of view, but not every program must be functional.

CodePudding user response：

As the other comments already stated, there is no problem in using input inside a function.

Note: Other people mention functional programming, but if you're teaching Python and especially input, I highly doubt this will have any impact on your course as Python is OOP at its core and functional programming may confuse your students.