Question

我了解错误背后的信息，但是在了解如何克服错误时迷路了。我正在尝试做的是，在for / loop中，名为pancake的变量将来自先前迭代pancake[i - 1]的值用作函数exit调用的第一个参数的输入。

我遇到的错误：

TypeError: 'float' object does not support item assignment

我的代码：

   def exit(number):
        def son():
            geometric = (math.exp(2))
            pancake = number * geometric
            return pancake

        return son()

    pancake_ac = exit()()
    pancake_ac[0] = pancake_ac

    for i in range(1, 10):
        pancake_ac[i] = exit(pancake_ac[i - 1])

Answer 1

precio_accion不是list或dict，而是浮点数，因此根本不需要precio_accion[0] = precio_accion行。如果您想要list：

import math
import random


def funcion_gbm(pi = 100, media = 0.10, volatilidad = 0.05):
    m = media
    v = volatilidad

    def funcion_anidada():
        exponencial = math.exp((m - (1/2) * v**2) * (1/365) +
                               v * math.sqrt(1/365) * random.normalvariate(0, 1))
        precio = pi * exponencial
        return precio

    return funcion_anidada


precio_accion = funcion_gbm()()

# Now precio_accion is a list and your iteration will work
precio_accion = [precio_accion]

编辑

现在让我们进入循环。首先，您的target_price不变，那么为什么要重新定义它呢？您可以在循环外定义一次：

target_price = 125

for rueda in range(1,1000):
    # Now you need to append to the list rather than trying to
    # access other elements that aren't in the list yet
    precio_accion.append(funcion_gbm(precio_accion[rueda - 1]))

    # You're comparing the last item in the list every time, so
    # you can just access it with -1
    if precio_accion[-1] == target_price:
        print("reached")

    # No need for else since it's just continuing the loop

TypeError：“浮动”对象不支持项目分配

1 个答案:

编辑