global
1234567891011121314151617181920212223242526
def a():
print(x)
y = 0
def b():
global x # x can't be change to 'nonlocal x, or error will arise'
x = 1
y = 2
def c():
nonlocal y
y = y + 1
def d():
nonlocal y
y = y + 1
# print(y)
a()
d()
c()
print(y)
b()
# in python, to make it easier to learn, it uses indent, with no {} to declare variable in functions
# to know how the variables from various functions, it uses global, nonlocal here in this example
# by using global, variable x can go to and from the functions wherever 'global' is define
# by using nonlocal, variable outside the upper level can be changed. Like the y in function d
# function only runs with codes inside when it is called and point to the address it is located
# to have no conflict between global and nonlocal,
# nonlocal can only be used up to the 2 layers of functions, say function b, in this case
Python
INFO