创建单行 python pandas 数据框
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Create single row python pandas dataframe
提问by HeXor
I want to create a python pandas DataFrame with a single row, to use further pandas functionality like dumping to *.csv.
我想用单行创建一个 python pandas DataFrame，以使用更多的 Pandas 功能，如转储到 *.csv。
I have seen code like the following being used, but I only end up with the column structure, but empty data
我已经看到使用如下代码，但我最终只得到了列结构，但数据为空
import pandas as pd
df = pd.DataFrame()
df['A'] = 1
df['B'] = 1.23
df['C'] = "Hello"
df.columns = [['A','B','C']]
print df
Empty DataFrame
Columns: [A, B, C]
Index: []
While I know there are other ways to do it (like from a dictionary), I want to understand why this piece of code is not working for me!? Is this a version issue? (using pandas==0.19.2)
虽然我知道还有其他方法可以做到（例如从字典中），但我想了解为什么这段代码对我不起作用！？这是版本问题吗？（使用熊猫==0.19.2）
回答by MaxU
In [399]: df = pd.DataFrame(columns=list('ABC'))
In [400]: df.loc[0] = [1,1.23,'Hello']
In [401]: df
Out[401]:
A B C
0 1 1.23 Hello
or:
或者：
In [395]: df = pd.DataFrame([[1,1.23,'Hello']], columns=list('ABC'))
In [396]: df
Out[396]:
A B C
0 1 1.23 Hello
