Pandas Data Frame is not correctly identified: Instance of 'tuple' has no 'filter' member

Question

I am writing a class containing pandas functionalities. As an input I have a pandas dataframe but python seems to not recognizing it right.

import pandas as pd

class box:
    def __init__(self, dataFrame, pers, limit):
        self.df = dataFrame,
        self.pers = pers,
        self.data = limit

    def cleanDataset(self):
        persDf = self.df.filter(regex=('^' + self.pers + r'[1-9]$'))
        persDF.replace({'-': None})

self.df.filter(...) gives me the warning: Instance of 'tuple' has no 'filter' member. I have found this but cannot apply the solution though since the problem is not caused by django.

Anyone who can help me out here?

Answer 1

Your problem is the comma at the end of self.df = dataFrame, (and self.pers = pers,). The comma isn't necessary here.

The comma makes the class think you're defining self.df as a tuple with one member. To check this, create a box object b and try print type(box.df). I'm guessing this will return <type 'tuple'>.

Remove the commas after the attribute definitions:

class box:
    def __init__(self, dataFrame, pers, limit):
        self.df = dataFrame
        self.pers = pers
        self.data = limit