[變數] 使用全域變數

##global variable here##

myvar = 'test1'

def my_func1():

    ##it will print the content of global variable##

    print(myvar)

my_func1()

def my_func2():

    myvar = 'test2'

    ##it will print the content of local variable##

    print(myvar)

my_func2()

##the content of global variable does not change##

print(myvar)

def my_func3():

    ##use global variable in function like this##

    global myvar

    myvar = 'test3'

    print(myvar)

my_func3()

##the content of global variable will be changed in the function##

print(myvar)