类型错误:float() 参数必须是字符串或数字,而不是“列表”python

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时间:2020-08-19 19:41:25  来源:igfitidea点击:

TypeError: float() argument must be a string or a number, not 'list' python

python

提问by Blazed

I have a problem with Python. This is my code:

我对 Python 有问题。这是我的代码:

def calcola():
            a = input()
            b = float(a[0].split("*"))
            c = float(a[0].split("/")) 
            d = float(a[0].split("-"))
            e = float(a[0].split("+"))
            j = float(a[1].split("*"))
            k = float(a[1].split("/")) 
            l = float(a[1].split("-")) 
            m = float(a[1].split("+")) 
            b = b[0]
            c = b[1]
            d = c[0]
            e = c[1]
            f = d[0]
            g = d[1]
            h = e[0]
            i = e[1]
            somma1 = b+c
            somma2 = d+e
            somma3 = f+g
            somma4 = h+i
            print(somma1)
            print(somma2)
            print(somma3)
            print(somma4)


calcola()

I've recieved some errors:

我收到了一些错误:

Traceback (most recent call last): File "file.py", line 29, in calcola() File "file.py", line 3, in calcola b = float(a[0].split("*")) TypeError: float() argument must be a string or a number, not 'list'

回溯(最近一次调用):文件“file.py”,第 29 行,在 calcola() 文件“file.py”,第 3 行,在 calcola b = float(a[0].split("*"))类型错误:float() 参数必须是字符串或数字,而不是“列表”

How can I transform the number in the list?

如何转换列表中的数字?

回答by Moses Koledoye

You can't call floaton a list directly. You can use mapto call floaton each item in the list. Like so:

您不能float直接调用列表。您可以使用map调用float列表中的每个项目。像这样:

b = map(float, a[0].split("*"))

In python 3.x

在 python 3.x 中

b = list(map(float, a[0].split("*")))

Or for more readability, use a list comprehension. Works for both python2 and python3:

或者为了提高可读性,请使用列表理解。适用于 python2 和 python3:

b = [float(s) for s in a[0].split("*")]

But be sure the items after splitting are floatable

但要确保拆分后的项目是可浮动的