python变量声明为全局变量的两种方法

def declare_a_global_variable():

    global global_variable_1

    global_variable_1 = 1

# Note to use the function to global variables

declare_a_global_variable()

global_variable_1 = 1

global_variable_2 = 2

def update_variables():

    global global_variable_1

    global_variable_1 = 11

    global_variable_2 = 12 # will update just locally for this function

update_variables()

print(global_variable_1) # prints 11

print(global_variable_2) # prints 2