Why is it possible to call a function b4 defining it or use a variable b4 creating it I.e read bottom to top in python

Question

Python
https://code.sololearn.com/c8J5KX893dPD/?ref=app

Answer 1

It isn't. I'm not sure what you mean by calling a function before you define it because you have literally defined your get_input() function at the very start of your code.

I do understand your confusion regarding using a variable before it has been created though, but that's not what is actually happening here. Your 'verb_dict' variable is created after the definition of the function in which it is used but, crucially, it is created *before that function is called*. When the function is called, it has been created and thus can be used.

Hope that makes sense.

Answer 2

Russ thanks I get it now. The problem of calling a function i'll post it here

Answer 3

Russ
def is_even(x):
if x == 0:
return True
else:
return is_odd(x-1)

def is_odd(x):
return not is_even(x)

print(is_odd(17))
print(is_even(23))

Thanks

Answer 4

I'm a little unsure as to whether you're still after an answer my answer is still basically the same as above.

The is_odd() function is called from the is_even() function and, although the function call is earlier in the code than the function definition, the crucial thing is that the definition comes before the is_even function is called. Consider this example:

def is_even(x):
if x == 0:
return True
else:
return is_odd(x-1)

print(is_even(23))

def is_odd(x):
return not is_even(x)

print(is_odd(17))

...this will cause an error because the is_even() function call (which leads to the is_odd() function call) comes before the is_odd() function definition. Hope that clears things up.

Answer 5

Thanks