为什么我的 running_profit 变量没有更新？

Question

我正在尝试创建一个 Martingale 投注模拟器。我的全局“running_profit”变量应该由“change_running_total”函数间接更新。running_total 变量已正确更新，但受 running_total 影响的 running_profit 变量未更新。

import random

round_n = 0

bet = 25

starting_funds = 5000

running_total = starting_funds

running_profit = running_total - starting_funds

goal_profit = 5000

wins = 0

losses = 0

rng_v = 0.00

def rng():

    """Generates random number"""

    global rng_v

    rng_v = random.random()

def winloss_generator():

    """Generates win/loss condition"""

    global rng_v

    if rng_v <= .49:

        return 'win'

    else:

        return 'loss'

def increase_winloss():

    """Increases wins or losses variable based on winloss_generator output"""

    global wins

    global losses

    if winloss_generator() == 'win':

        wins += 1

        return 'win'

    elif winloss_generator() == 'loss':

        losses += 1

        return 'loss'

    else:

        print('error')

def increase_round():

    """Increases round number by 1"""

    global round_n

    round_n += 1

    print('round: ', round_n)

def change_running_total():

    """Increases or decreases running_total based on winloss_generator"""

    global running_total

    if winloss_generator() == 'win':

        running_total += bet

    elif winloss_generator() == 'loss':

        running_total -= bet

    else:

        print('error')

def print_current_record():

    """Prints current win/loss record to screen"""

    print('Current Record: ', wins, 'wins, ', losses, 'losses')

def print_winloss():

    """Prints win/loss condition to screen"""

    print(winloss_generator(), 'print_winloss'.upper())

def print_profit():

    """Print running profit to screen"""

    print(running_profit, 'print_profit (variable)'.upper())

    print(running_total - starting_funds, 'print_profit (calculated)'.upper())

def return_current_funds():

    """Returns running total of funds"""

    global running_total

    return running_total

Answer 1

您在顶部声明变量：running_profit = running_total - starting_funds然而，这条线路只运行一次；您没有在这里建立某种关系，只要您更改running_total或 ，它就会自动更新starting_funds。如果你想这样做，请将其变成一个函数：def running_profit():&nbsp; &nbsp; global running_total, starting_funds&nbsp; &nbsp; return running_total - starting_funds现在，每次您调用时running_profit()，它都会根据这些变量的当前值进行计算。旁注，与其使用全局变量来完成所有这些操作，不如将其封装到一个类中。