如何创建具有指定行数和列数的 Pandas DataFrame

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时间:2020-09-14 06:07:45  来源:igfitidea点击:

How to create a pandas DataFrame with specified number of rows and columns

pythonpandas

提问by Bhargav

I'm new to pandas concept, Is it possible to create a DataFrame of size 1 row and column-length of 8.

我是Pandas概念的新手,是否可以创建大小为 1 行和列长为 8 的 DataFrame。

I tried:

我试过:

import pandas as pd
df = pd.DataFrame({'Data':[]})

but this only creates one row and one column.

但这只会创建一行和一列。

回答by user3483203

You can specify both indexand columnsto determine the shape. Values will default to NaN.

您可以同时指定indexcolumns来确定形状。值将默认为NaN.

pd.DataFrame(index=np.arange(1), columns=np.arange(8))

     0    1    2    3    4    5    6    7
0  NaN  NaN  NaN  NaN  NaN  NaN  NaN  NaN

回答by rahlf23

Yes, it is possible to create a dataframe of any shape. For example:

是的,可以创建任何形状的数据框。例如:

import pandas as pd
import numpy as np

df = pd.DataFrame(np.random.randint(0,10, size=(1,8)))

Yields:

产量:

   0  1  2  3  4  5  6  7
0  1  5  2  3  4  8  7  1

Then we can return the shape of this dataframe using df.shape:

然后我们可以使用以下命令返回此数据框的形状df.shape

(1, 8)