Python Pandas DataFrame with only a single number stored?

问题

AzureML's Python Script module requires to return a Pandas DataFrame. I want to return only a value and I do this:

result=7
dataframe1=pd.DataFrame(numpy.zeros(1))
dataframe1[0][0]=result

by which I am able to return just a single value in Azure ML's Python Script module.

What is a proper way to create a pandas DataFrame with a single value?

回答1:

Following code should work:

import pandas as pd
def azureml_main(dataframe1 = None, dataframe2 = None):
    result = pd.DataFrame({'mycol': [123]})
    return result,

回答2:

As EdChum commented

dataframe1=pd.DataFrame([result], dtype=float) 

and it works, tested, instead of

result=7
dataframe1=pd.DataFrame(numpy.zeros(1))
dataframe1[0][0]=result

where we don't need to use numpy to initiate the return value with zeroes.

P.s. EdChum can make this his answer if he wants.

来源：https://stackoverflow.com/questions/44409066/python-pandas-dataframe-with-only-a-single-number-stored