Question

我是Python的新手，我想将float值存储在列表中，然后使用列表中的值进行处理，直到我将其重置为空为止。我正在抛出此错误：

python TypeError: can't multiply sequence by non-int of type 'list' >>>

该程序是一个基本的距离，速度和时间计算器，我还没有添加类似单位的内容，但是遇到了这个障碍。如何在equate()函数中正确乘法？

import math
import random
import os

distance = []
speed = []
time = []
result = []

def di():
    while True:
        try:
            di = float(input('Enter Distance:> '))
            distance.append(di)
            print('You entered', distance)
            sp()
        except ValueError:
            print('Thats not a number')
            pass

def sp():
    while True:
        try:
            sp = float(input('Enter Speed:> '))
            speed.append(sp)
            print('You have entered', speed)
            ti()
        except ValueError:
            print('Thats not a number')
            pass

def ti():
    while True:
        try:
            ti = float(input('Enter Time:> '))
            time.append(ti)
            print('You have entered', time)
            equate()
        except ValueError:
            print('Thats not a number')
            pass

def equate():
    print('What do you want to calculate?')
    option = input('1.Distance, \n2.Speed, \n3.Time, \n4.Exit Program, \n:>')
    if option == '1':
        res = speed * time
        result.append(res)
        print(result)
    elif option == '2':
        res = distance / time
        result.append(res)
        print(result)
    elif option == '3':
        res = distance / speed
        result.append(res)
        print(result)
    elif option == '4':
        sys.exit('Goodbye')
    else:
        print('Thats not an option')
        pass

def running():
    input('Distance Speed and Time Caluclator \nPress any key to enter the values')
    di()

running()

编辑：完全错误

win32上的Python 3.4.4（v3.4.4：737efcadf5a6，2015年12月20日，20:20:57）[MSC v.1600 64位（AMD64）] 输入“版权”，“信用”或“ license（）”以获取更多信息。

===================== RESTART: C:\Python34\equations.py =====================
Distance Speed and Time Caluclator 
Press any key to enter the values
Enter Distance:> 30
You entered [30.0]
Enter Speed:> 20
You have entered [20.0]
Enter Time:> 10
You have entered [10.0]
What do you want to calculate?
1.Distance, 
2.Speed, 
3.Time, 
4.Exit Program, 
:>1
Traceback (most recent call last):
  File "C:\Python34\equations.py", line 69, in <module>
    running()
  File "C:\Python34\equations.py", line 67, in running
    di()
  File "C:\Python34\equations.py", line 16, in di
    sp()
  File "C:\Python34\equations.py", line 27, in sp
    ti()
  File "C:\Python34\equations.py", line 38, in ti
    equate()
  File "C:\Python34\equations.py", line 47, in equate
    res = speed * time
TypeError: can't multiply sequence by non-int of type 'list'

Answer 1

在equate函数中进行乘法运算时似乎发生了错误。我认为您正在尝试将列表乘以列表，如@ TigerhawkT3所说。相反，我建议每当在speed[-1]中引用time[-1]，distance[-1]和equate()（以获取最后一个项目，因为这是用户刚刚输入的内容）时，功能。例如，乘以：

if option == '1':
    res = speed[-1] * time[-1]
    result.append(res)
    print(result)

编辑：感谢您使问题更加简洁

Answer 2

首先，您不需要在每个函数上进行while循环，一次就足够了。其次，您要计算列表中每个项目的值。就您而言，选项示例：

if option == '1':
        #it would be nice to check if arrays are the same size etc.
        for i in range(len(time)):
            result.append(speed[i] * time[i])

        print(result)

请记住，结果就是错误。

如何在python中与列表相乘

2 个答案: