''' Function invocations require parentheses
'''

s = "Black hole image revealed for first time ever"

x = s.split

# Basically x doesn't get the result of the function invocation.
# It just gets the function itself! (<built-in method split of str object at 0x0000014FBA8491B0>)
# So x now stores the function s.split itself but it's not calling the function.

# Variables are first class. They can be used, assigned, copied, etc.
# Python allows you to make functions first class.
# You can now have variables that store functions :)

print( x )  # prints s.split

# x now has s.split as the function
x() # is the same thing as s.split() since x = s.split

words = x() # We have now stored the function in a variable and invoked that function
            # by doing variable()

print( words )  # prints s.split()