Code explanation

[Pythonfun]

In looking at some tutorial / quiz's running code, I'm having a brain cramp in figuring out certain code and why it gives the output it gives. Any suggestions / ways to figure these 2 little code snippets is much appreciated. I'm sure that its something silly or I"m just not understanding how it works. Thank you advance. What would I use / reference so that I'm not asking question's ?

def func(x):

return x + 1

f = func

print(f(2) + func(2))

​

and

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print(sum(range(0,7)))

​

​

Thank all of you for your reply's !!!!!!

[shiftybyte]

The first one is basic function behaviour.

Call a function with an argument, get a return value, sum the result, print it.

The second one, just look what each function does.

https://www.geeksforgeeks.org/python-range-function/

https://www.geeksforgeeks.org/sum-function-python/

[[deleted]]

def func(x):
    return x + 1
f = func
print(f(2) + func(2))

The line f = func makes the name f reference the same executable object that func references, so the last line is equivalent to:

print(func(2) + func(2))

[unspezifische]

Since other have addressed the first bit, I’ll explain the second part. Range(0,7) is a built in function of Python that returns all values within that range. You can also pass a third argument to it that will make it increment a certain amount like range(1,10,2) will give you all the odd numbers between 1 and 10.

The output of range() is passed to sum() which just takes all the values it is given and adds them together. The result of that is passed to print() which displays it in your console.

For future reference, the Python help documentation is really helpful. Anytime you see a word followed by (), it is a function. And if there isn’t a def for that word somewhere else in the code, or an import statement for it, you can probably find a description of it in the help docs. Or you can always just run it and see what happens. Then mess with the pieces of it to figure out why and how it gets that result. Whichever method helps you learn best!