Why is my function getting this error when im putting it to a global?

Question

Im just playing with the python (global) function. An Error will appear why?

def h():
global x
x = "Hi"
print(x + " Guys")

print(x)

NameError: name 'x' is not defined

It is supposed to print "Hi" but it didnt why?

Answer 1

Here is your sample reworked:

x = 'something'
def h():
global x
x = "Hi"
print(x + " Guys")

print(x) # result= 'something'

h() # result = 'Hi Guys'
print(x # result = 'Hi'

Answer 2

Mabe it's because you have never called h().

Answer 3

The keyword 'global' is reserved for external reference, i. e. the variable used as global within a function must be defined in the upper scope for that function. So, in your case if x is not defined before h() the NameError is justified.

Answer 4

global x, in simple terms, means:

'If we assign anything to x, let's do that in the global scope!'

Before you call your function, no assigning to x has taken place.

So there is no x when you try to print it.