unbounded variable

[akbarza]

hi
in code:

'''
ref:https://www.bhavaniravi.com/python/advanced-python/unbound-variables-in-python
'''

def take_sum(a, b, c):
    return a+b+c

def main1():
    print(take_sum)    # output is as :<function take_sum at 0x1031c84c0>
    if "take_sum" not in  globals():
        print("take_sum is not in globals()")
    else:
        print("take_sum is in globals()")
    print(globals())
    print('-'*30)    


def main():
    if "take_sum" not in globals():
        take_sum = lambda x,y,z: x+y+z
    print(take_sum)
    

main1()
main()

output has the below error:

Error:
Traceback (most recent call last):
  File "D:\akb_python\akb_py_projects\unbounded_variable.py", line 25, in <module>
    main()
  File "D:\akb_python\akb_py_projects\unbounded_variable.py", line 21, in main
    print(take_sum)
UnboundLocalError: local variable 'take_sum' referenced before assignment

'''
I read the explanation given in the address in the docstring, but I did not understand. (I selected the thread subject from there).
what is the problem?plz, explain
thanks