[英]Why does the c_score variable and p_score variable increase unstoppably when it should just increase by one in score?
下面的用Python编写的代码*在codekulptor中编译,并没有使score()函数中的全局变量c_score和p_score仅增加1,而是无限地增加它。
*忽略任何可能引起的格式化错误,代码可以很好地编译,只是功能无法按预期工作。
import random
import simplegui #graphic library
'''Following variables are all global variables
which are used in various capacities throughout the program. '''
message = "Welcome to Stone, Paper, Scissors"
c_message = "Computer is waiting for you to begin"
w_message = "The game hasn't begun yet"
number = 0
c_number = 0
c_score = 0
p_score = 0
'''First of the many helper functions, simulates computer
choice and prints relevant message in GUI window'''
def comp_choice():
global c_number #Calling global variable
global c_message
c_number = random.randrange(1,4) #'random' function
if c_number == 1:
c_message = "Computer chose Rock"
elif c_number == 2:
c_message = "Computer chose Paper"
elif c_number == 3:
c_message = "Computer chose scissors"
return c_message
def score():
global c_score
global p_score
global number
global c_number
difference = number - c_number
if difference == -1 or difference == 2:
c_score += 1
elif difference == 1 or difference == -2:
p_score += 1
return str(p_score) + ' ' + str(c_score)
#Functions which code user choice buttons
def rock():
global message #calls for global variable
global number
number = 1
message = "You chose Rock"
'''This function call here is used to stimulate each
round, the one following this applies the logic
of the original game to determine and give results.'''
comp_choice()
game_logic()
def paper():
global number
global message
number = 2
message = "You chose Paper"
comp_choice()
game_logic()
def scissors():
global number
global message
number = 3
message = "You chose Scissors"
comp_choice()
game_logic()
# Heart of the game
def game_logic():
global number
global c_number
global w_message
difference = number - c_number
if difference == -1 or difference == 2:
w_message = "Computer Wins!"
elif difference == 1 or difference == -2:
w_message = "Player Wins!"
else:
w_message = 'Player and Computer Tie'
def draw(canvas):
canvas.draw_text("Player's choice: %s" % message, [0,100], 30, "Red")
canvas.draw_text("Computer's choice: %s" % c_message, [0,125], 30, "Green")
canvas.draw_text(w_message, [0,150], 30, "Black")
canvas.draw_text(score(), [0,75], 30, "Black")
'''Following code registers buttons and their functions, it also creates the playing window.'''
frame = simplegui.create_frame("Home", 700, 200)
frame.set_canvas_background('White')
button1 = frame.add_button( "Rock", rock, 100)
button2 = frame.add_button( "Paper", paper, 100)
button3 = frame.add_button("Scissors", scissors, 100)
frame.set_draw_handler(draw)
frame.start()
问题不在于您的score
功能 。 那“正确”地工作。 问题是您每次必须绘制GUI时都要调用score()
。
就像调用w_message
一样,而不是调用score()
。 让game_logic()
函数设置一个score
字符串。
作为附带说明,您应该重新考虑您的代码结构。 使用global
如果你有应该只有真正被使用; 否则,您应该使用参数。
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