How to import a pandas dataframe from a python file to another python file

Question

I have two python files in the same folder: main.py and analysis.py.

In the analysis.py file I have a pandas dataframe called df1, inside a class called Ana(path, file)

I have imported the class to main.py successfully by writing from analysis import Ana, but if I try to do something with df1 it says df1 is not defined.

How do I define df1 in the main.py file? I am quite new to Python so any help will be very appreciated, thank you.

P.S. I forgot to add, I am trying to use the df1 from the Ana function in the analysis.py file in the function Upload in the main.py file

Andrew try to use functions to return where lives the dataframe then import the function in second file. stackoverflow.com/a/20309470/8807216 — Rodrigo Espinoza
– Rodrigo Espinoza, Commented Jan 28, 2020 at 15:06

Ivan · Accepted Answer · 2020-01-28 15:08:58Z

1

Do a function returning Ana. If it's a member:

def ret_Ana():
    return self.Ana

answered Jan 28, 2020 at 15:08

Ivan

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Comments

Mikhail Vlasenko · Accepted Answer · 2020-01-28 15:46:33Z

0

Use Ana.df1 instead. It is a class's variable, so you first specify a class instance (or a class itself) and then df1

a = Ana()
a.df1

If you define df1 in the function Upload, you can add df1 to return values like this

def upload(args):
    #your code
    return your_return, df1

So now you can get df1 with return_value, df1 = Ana.upload()

edited Jan 28, 2020 at 15:46

answered Jan 28, 2020 at 15:01

Mikhail Vlasenko

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5 Comments

andrew_helpme Over a year ago

I get AttributeError: 'NoneType' object has no attribute 'df1' when writing that

Mikhail Vlasenko Over a year ago

@andrew_helpme could you please share your Ana code in the question?

Mikhail Vlasenko Over a year ago

@andrew_helpme maybe now I've answered your question?

andrew_helpme Over a year ago

Sorry I'm not sure what you mean with 'So now you can get df1 with return_value, df1 = Ana.upload()'

Mikhail Vlasenko Over a year ago

@andrew_helpme if upload already returns something and you don't want to lose it, you can return multiple variables read here. if upload does not return anything now, then just write df1 = Ana.upload() and return df1 in upload itself

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