pandas Python：未正确调用 DataFrame 构造函数
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Python: DataFrame constructor not properly called
提问by Indole
So im walking thourhg the pandas manual and I dont understand what im doing wrong. Could somebody please help? I mean this is standard code from the manual, except that I use a different random function I believe.
所以我正在阅读Pandas手册，我不明白我做错了什么。有人可以帮忙吗？我的意思是这是手册中的标准代码，只是我使用了我认为不同的随机函数。
http://pandas.pydata.org/pandas-docs/dev/advanced.html--> sample window #3
http://pandas.pydata.org/pandas-docs/dev/advanced.html-->示例窗口 #3
import numpy as np
from pandas import DataFrame
import random
arrays = [np.array(['bar', 'bar', 'baz', 'baz', 'foo', 'foo', 'qux', 'qux']),
np.array(['one', 'two', 'one', 'two', 'one', 'two', 'one', 'two'])]
df = DataFrame(random.random(), index=arrays)
print(df)
>>>DataFrame constructor not properly called!<<<
回答by Padraic Cunningham
pandas is using np.random.randnwhich returns an array. You are passing a single float value using random.random():
pandas 正在使用np.random.randn它返回一个数组。您正在使用random.random()以下方法传递单个浮点值：
In [49]: import numpy as np
In [50]: randn = np.random.randn
In [51]: randn(8)
Out[51]:
array([ 1.5530158 , -0.08940148, 0.10467891, -0.05558743, -0.90833863,
-1.05916262, 0.02431885, -2.08940353])
In [52]: from random import random
In [53]: random()
Out[53]: 0.697960149473455
If you look at the Dataframe documentation you see what can be passed as data:
如果您查看 Dataframe 文档，您会看到可以作为数据传递的内容：
Parameters :
data : numpy ndarray (structured or homogeneous), dict, or DataFrame Dict can contain Series, arrays, constants, or list-like objects
参数：
数据：numpy ndarray（结构化或同类）、dict 或 DataFrame 字典可以包含系列、数组、常量或类似列表的对象
