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This is a special page connected to [[Python Functions]]
Scope refers to the parts of a program or function in which a variable is relevant.
These variables are set at the program level and are available at any point after they are initiated.
If a variable is called inside a function but cannot be found initiated within that function, Python will look for its value in the Global scope.
You can create a global variable from within a function with the global
keyword.
E.g.
artist = "Michael Jackson"
def printer(artist):
global internal_var
internal_var = "Whitney Houston"
print(artist, "is an artist")
printer(artist)
printer(internal_var)
>>> Michael Jackson is an artist
>>> Whitney Houston is an artist
These variables are available only within the function in which they were initialised, and can only be made visible to the program at large as a return value.
If we try do the previous example without the global
keyword, this nature is made apparent with the following error.
artist = "Michael Jackson"
def printer(artist):
internal_var= "Whitney Houston"
print(artist,"is an artist")
printer(artist)
printer(internal_var)
Michael Jackson is an artist
> 10 printer1(internal_var1)
NameError: name 'internal_var1' is not defined
Rendering context...