Python 2.7.10：在函数之间的全局变量中加1

Question

So basically my code is this:

global I_like_dem_apples
I_like_dem_apples = 0
global I_dont_like_dem_apples 
I_dont_like_dem_apples = 0

def how_do_you_like_them_applez(steve_jobs):
    if steve_jobs == "Empire" or steve_jobs == "Gala":
        return I_like_dem_apples == I_like_dem_apples + 1

    if steve_jobs == "Rome" or steve_jobs == "York":
        return I_dont_like_dem_apples == I_dont_like_dem_apples + 1

    else:
        return I_dont_like_dem_apples == I_dont_like_dem_apples + 1

def good_day (the_good_stuff):
    for apple in the_good_stuff:
        how_do_you_like_them_applez(apple)
    if I_dont_like_dem_apples > I_like_dem_apples or I_dont_like_dem_apples == I_like_dem_apples:
        return "false"

    if I_like_dem_apples > I_dont_like_dem_apples:
        return "true"

good_day(["Gala", "York", "Rome"])
print I_like_dem_apples 
print I_dont_like_dem_apples

When I run this, I get no error messages, but instead get this:

0

0

[Finished in 0.0s]

What I was hoping to get is:

1

2

I've tried changing the code around adding 1 a bit,

def how_do_you_like_them_applez(steve_jobs):
    if steve_jobs == "Empire" or steve_jobs == "Gala":
        return I_like_dem_apples =+ 1

    if steve_jobs == "Rome" or steve_jobs == "York":
        return I_dont_like_dem_apples =+ 1

    else:
        return I_dont_like_dem_apples =+ 1

and this

def how_do_you_like_them_applez(steve_jobs):
    if steve_jobs == "Empire" or steve_jobs == "Gala":
        return I_like_dem_apples = I_like_dem_apples + 1

    if steve_jobs == "Rome" or steve_jobs == "York":
        return I_dont_like_dem_apples = I_dont_like_dem_apples + 1

    else:
        return I_dont_like_dem_apples = I_dont_like_dem_apples + 1

but I get the invalid syntax error message. I'm pretty sure the only things that could be wrong are the global variables, but I wouldn't because that's how I thought global variables worked.

Answer 1

1. Get rid of all global things, you use them incorrectly.
2. EDIT Add global I_like_dem_apples,I_dont_like_dem_apples to all involved functions.
3. Replace return I_like_dem_apples == I_like_dem_apples + 1 and all similar statements with I_like_dem_apples += 1 .
4. Fix your variable names, I_like_dem_apples is a horrible name.
5. Do not return "false" and "true" , return False and True .

Answer 2

Replace the returns in the first two functions through "return(I_like_dem_apples + 1)" and "return(I_dont_like_dem_apples + 1)". Replace "true" and "false" through "True" and "False". You don't need the globals.