我想要一个列表来附加多个参数。 Python

Question

d =[]
for i in range(len(X_test)):
    d.append(X_test[i], y_test[i], y_pred[i])
    print(X_test[i],"  ", y_test[i], " ", y_pred[i])

print(d)

这是输出

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Input In [33], in <cell line: 2>()
      1 d =[]
      2 for i in range(len(X_test)):
----> 3     d.append(X_test[i], y_test[i], y_pred[i])
      4     print(X_test[i],"  ", y_test[i], " ", y_pred[i])
      6 print(d)

TypeError: list.append() takes exactly one argument (3 given)

如果我只是输出而不附加，这就是我得到的：

d =[]
for i in range(len(X_test)):
    print(X_test[i],"  ", y_test[i], " ", y_pred[i])

print(d)

这是输出

---------------------------------------------------------------------------
[1.5]    37731.0   40835.10590871474
[10.3]    122391.0   123079.39940819163
[4.1]    57081.0   65134.556260832906
[3.9]    63218.0   63265.36777220843
[9.5]    116969.0   115602.64545369372
[8.7]    109431.0   108125.89149919583
[9.6]    112635.0   116537.23969800597
[4.]    55794.0   64199.96201652067
[5.3]    83088.0   76349.68719257976
[7.9]    101302.0   100649.13754469794

所以这就是我想要做的。 我想要一个列表来附加 3 个参数。 这样我的列表将如下所示：

[[1.5, 37731.0, 40835.10590871474]
[10.3, 122391.0, 123079.39940819163]
[4.1, 57081.0, 65134.556260832906]
[3.9, 63218.0, 63265.36777220843]
[9.5, 116969.0, 115602.64545369372]
[8.7, 109431.0, 108125.89149919583]
[9.6, 112635.0, 116537.23969800597]
[4.0, 55794.0, 64199.96201652067]
[5.3, 83088.0, 76349.68719257976]
[7.9, 101302.0, 100649.13754469794]]

Answer 1

看起来你想要一个列表列表。 尝试将第 3 行更改为

d.append([X_test[i], y_test[i], y_pred[i]])

将这三个项目附加为列表。

Answer 2

您只能附加一个值。 在这种情况下，您要附加一个包含 3 个值的列表。

d.append([X_test[i], y_test[i], y_pred[i]])

如果您想一次附加 3 个单独的值，请使用相同的列表作为extend方法的参数。

>>> d = []
>>> d.extend([1,2,3])
>>> d
[1, 2, 3]

Answer 3

d = []

for i in range(len(X_test)):
    e = []
    e.append(X_test[i])
    e.append(y_test[i])
    e.append(y_pred[i])
    d.append(e)
    print(X_test[i],"  ", y_test[i], " ", y_pred[i])
print(d)

Output :
1.5    37731.0   40835.10590871474
10.3    122391.0   123079.39940819163
4.1    57081.0   65134.556260832906
3.9    63218.0   63265.36777220843

[
    [1.5, 37731.0, 40835.10590871474], 
    [10.3, 122391.0, 123079.39940819163], 
    [4.1, 57081.0, 65134.556260832906], 
    [3.9, 63218.0, 63265.36777220843]
]

Answer 4

我想你正在寻找这样的东西。

X_test = ['1.5', '10.3', '4.1']
y_test = ['37731.0', '122391.0', '57081.0' ]
y_pred = ['40835.10590871474','123079.39940819163','65134.556260832906']
d = list()
for i in range(len(X_test)):
    if X_test[i] and y_test[i] and y_pred[i]:
        d.append([X_test[i], y_test[i], y_pred[i]])
for item in d:
    print(item)