小编viv*_*vek的帖子

我试图同时使用list.files和dir; 两个命令都返回相同的输出.这两个命令之间的关键区别是什么以及它们的使用环境是什么？

from sklearn import MinMaxScaler, StandardScaler
import numpy as np

a = ([1,2,3],[4,5,6])
stan = StandardScaler()
mima = MinMaxScaler()
stan.fit_tranform(a)
mima.fit_transform(a)

results after runnin stan and mima

array([[-1., -1., -1.],
   [ 1.,  1.,  1.]])

array([[0., 0., 0.],
   [1., 1., 1.]])

但是，当我尝试传递这样的一维数组时，

b = np.random.random(10)
stan.fit_tranform(b)
mima.fit_transform(b)

我有这样的错误

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/anaconda3/lib/python3.6/site-packages/sklearn/base.py", line 517, in  fit_transform
return self.fit(X, **fit_params).transform(X)
File "/anaconda3/lib/python3.6/site-packages/sklearn/preprocessing/data.py",  line 308, in fit
return self.partial_fit(X, y) 
File "/anaconda3/lib/python3.6/site-packages/sklearn/preprocessing/data.py", line 334, in …

有没有办法在Python中生成随机字母。我遇到过一个代码，可以从 az 生成随机字母。

例如，以下代码生成以下输出。

import pandas as pd
import numpy as np
import string

ran1 = np.random.random(5)
print(random)
[0.79842166 0.9632492  0.78434385 0.29819737 0.98211011]

ran2 = string.ascii_lowercase
'abcdefghijklmnopqrstuvwxyz'

但是，我想生成随机字母，输入为随机字母的数量（示例 3），所需的输出为 [a, f, c]。提前致谢。

我无法在 Jupyter 笔记本中绘制直方图。这是下面的代码和响应它的错误消息。

import pandas as pd
import numpy as np
from sklearn.datasets import load_boston
import matplotlib.pyplot as plt

housing_data = load_boston()
%matplotlib inline
housing_data.hist(bins = 50, figsize = (20, 15))
plt.show()

KeyError                                  Traceback (most recent call last)
/anaconda3/lib/python3.6/site-packages/sklearn/utils/__init__.py in          __getattr__(self, key)
60         try:
---> 61             return self[key]
62         except KeyError:

KeyError: 'hist'

During handling of the above exception, another exception occurred:

AttributeError                            Traceback (most recent call last)
<ipython-input-17-570a88b85d5d> in <module>()
----> 1 housing_data.hist(bins = 50, figsize = (20, 15)) …