如何在 Python 中循环和更新变量 [关闭]

Question

我正在制作一个经济模拟器。我试图不断循环并获得/亏损，但它没有显示更新的值。它只是显示默认值和变量。我不太擅长数学变量。我已经相当成功地循环了它，尽管我认为它每次循环时都会重置变量。

import time

money = 2
moneyfo = "{:.2f}".format(money)

boughtw = 0
woodsalea = 1 
woodinv = 0
woodprice = (woodsalea * 2)
woodpricefo = "{:.2f}".format(woodprice)
amntw = 0
buywcost = 0

foodinv = 0
foodsalea = 1
foodprice = (woodsalea * 2)
foodpricefo = "{:.2f}".format(foodprice)
amntf = 0
buyfcost = 0

def start():
  print ("Products are wood food and stone")
  print ("""Prices are wood """ + woodpricefo + " food " + foodpricefo + " stone")

def buysale():
  bos = input("""Buy, Sell or Check Inventory?
""")
  if bos == ("Buy"):
    btyp = input("""Wood, Food, Or Stone?
""")
    if btyp == ("Wood"):
      amntw = input("""0-100
""")
      buywcost = float(amntw) * woodprice
  buywcostfo = "{:.2f}".format(buywcost)
  print ("That will be $" + buywcostfo + " you have " + str(money) + " dollars would you still like to buy?")
  buywyn = input("""Yes Or No
""")
  if buywyn == ("Yes") and money >= buywcost:
    print("You have bought Wood")
    boughtw = amntw
    boughtw = woodinv
    boughtw * woodprice - money
    woodsalea = boughtw
    print (woodsalea) 
    print (boughtw) 
    print (money)
    start()
    buysale()
  if bos == ("Sell"):
    styp = input("""Wood, Food, Or Stone
""")
    if styp == ("Wood"):
      amntw = input("""0-100
""")

start()
buysale()

Answer 1

我很确定您的问题在于以下几点：

    boughtw = amntw
    boughtw = woodinv
    boughtw * woodprice - money
    woodsalea = boughtw

所以要了解每个人的作用： 开头：buyw = 0，amntw的值取决于用户输入，woodinv = 0，woodprice = 2，money = 2，woodsalea = 1

第一行将amntw（用户输入）的值赋给buyw (0)。现在buyw 具有用户输入的值。 第二个like 将woodinv (0) 的值分配给buyw（用户输入）。现在，buyw 的值再次为 0。 第 3 行计算值 -2，但不将其分配给任何东西。 第 4 行将 buyw (0) 的值分配给 woodsalea (1)。 woodsalea 现在的值为 0。

我很确定你的意思更像是：

boughtw = float(amntw)
woodinv = woodinv + boughtw
money = money - boughtw * woodprice
woodsalea = boughtw //not entirely sure about this line. I'm not sure what you mean to track with woodsalea

您的代码还有很多其他问题。如果人们没有完全按照您的期望输入或尝试遵循您尚未实施的路径（例如购买 Wood 以外的任何东西），它将崩溃，但以上内容至少应该解释为什么从一次运行到下一个。