数据类型定义TypeE

Question

import cmath
import math
import random
import time

P = []
V = []
Vin = []

def Compute_wn_win(n,V,Vin):
    for i in range (0,n):
        V.append(complex(math.cos(2*math.pi*i/n),math.sin(2*math.pi*i/n)))
        Vin.append(1/(complex(math.cos(2*math.pi*i/n),math.sin(2*math.pi*i/n))))    

Compute_wn_win(8,V,Vin)

for i in range(0,8):
    random_number = random.uniform(-1.0,1.0)
    P.append(random_number)

def FFT(P,V,n):
    if(n==1):
        return P[0]
    else:
        Peven = []
        Podd = []
        for i in range(0,n/2):
            Peven.append(P[2*i])
            Podd.append(P[(2*i)+1])
        Vsquared = []
        for i in range(0,n/2):
            Vsquared.append(V[i]*V[i])
        Sole = FFT(Peven,Vsquared,n/2)
        Solo = FFT(Podd,Vsquared,n/2)
        Sol = [0 for x in range(0,n)]
        for i in range(0,n/2):
            Sol[i] = Sole[i]+V[i]*Solo[i]
            Sol[i+n/2] = Sole[i]-V[i]*Solo[i]
        return Sol
Sol = FFT(P,V,8)

我对Python还不熟悉。我有以下代码。但是，对于第Sole = FFT(Peven,Vsquared,n/2)行和第Sol[i] = Sole[i]+V[i]*Solo[i]行，我得到了以下错误。但是，我已经将、Sole、Solo和Sol定义为list数据类型，所以我不明白为什么它提到float数据类型没有属性getitem

准确的错误是

Traceback (most recent call last):
  File "/Users/globetrekker/Documents/CS5050/Assignment7/Test_py.py", line 40, in <module>
    Sol = FFT(P,V,8)
  File "/Users/globetrekker/Documents/CS5050/Assignment7/Test_py.py", line 33, in FFT
    Sole = FFT(Peven,Vsquared,n//2)
  File "/Users/globetrekker/Documents/CS5050/Assignment7/Test_py.py", line 33, in FFT
    Sole = FFT(Peven,Vsquared,n//2)
  File "/Users/globetrekker/Documents/CS5050/Assignment7/Test_py.py", line 37, in FFT
    Sol[i] = Sole[i]+V[i]*Solo[i]
TypeError: 'float' object has no attribute '__getitem__'

Answer 1

Sole和Solo是对FFT()的递归调用的返回值，但是FFT()的基本情况（当n == 1）返回一个浮点，而不是一个列表，因此在基本情况之上的步骤将通过尝试索引浮点而失败。大概，您希望将基本情况中的return P[0]更改为return [P[0]]

Answer 2

这是一个浮动：

for i in range(0,n/2):

签出：I keep getting this error for my simple python program: "TypeError: 'float' object cannot be interpreted as an integer"