Class instance variable not updating

Question

With class definition of:

import pandas as pd

class ScoreDataManager:

    def __init__(self):
        self.frameColumns = ['Reference', 'Translation', 'METEOR', 'TER', 'BLEU']
        self._df = pd.DataFrame(columns=self.frameColumns)
        

    def add_row(self, ref, trans, meteor, ter, bleu):
        self._df.append({'Reference': ref, 'Translation': trans, 'METEOR': meteor, 'TER': ter, 'BLEU': bleu},
                        ignore_index=True)

    def show(self):
        print(self._df.head())

If I run:

x = ScoreDataManager()
x.add_row('abc', 'abcd', 0.9, 0.87, 0.901)
x.show()

I get:

Empty DataFrame
Columns: [Reference, Translation, METEOR, TER, BLEU]
Index: []

But I expect the dataframe to contain the appended row.

user15801675 · Accepted Answer · 2021-07-29 12:06:33Z

1

Unlike normal append(), the append() is not in-place. You have to store the output.

def add_row(self, ref, trans, meteor, ter, bleu):
        self._df=self._df.append({'Reference': ref, 'Translation': trans, 'METEOR': meteor, 'TER': ter, 'BLEU': bleu},
                        ignore_index=True)

answered Jul 29, 2021 at 12:06

user15801675

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