How to apply method/function to a dataframe in python

Question

The function is:

def combine(row):
    count = 0
    stage = ""
    if (str(row.doggo) == "doggo"):
        stage = "doggo"
        count += 1

    if row.floofer == "floofer":
        stage = "floofer"
        count += 1

    if row.pupper == "pupper":
        stage = "pupper"
        count += 1

    if row.pupper == "puppo":
        stage = "puppo"
        count += 1

    if count == 0:
        return pd.np.NAN
    elif count == 1:
        return stage
    else:
        return "multiple"

While calling the method:

df_twitter_archive_clean["status"] = df_twitter_archive_clean[["doggo","floofer","pupper","puppo"]].apply(combine)

The error message appears:

--------------------------------------------------------------------------- AttributeError Traceback (most recent call last) in ----> 1 df_twitter_archive_clean["status"] = df_twitter_archive_clean[["doggo","floofer","pupper","puppo"]].apply(combine)

~/anaconda3/lib/python3.7/site-packages/pandas/core/frame.py in apply(self, func, axis, broadcast, raw, reduce, result_type, args, **kwds) 6485 args=args, 6486 kwds=kwds) -> 6487 return op.get_result() 6488 6489 def applymap(self, func):

~/anaconda3/lib/python3.7/site-packages/pandas/core/apply.py in get_result(self) 149 return self.apply_raw() 150 --> 151 return self.apply_standard() 152 153 def apply_empty_result(self):

~/anaconda3/lib/python3.7/site-packages/pandas/core/apply.py in apply_standard(self) 255 256 # compute the result using the series generator --> 257 self.apply_series_generator() 258 259 # wrap results

~/anaconda3/lib/python3.7/site-packages/pandas/core/apply.py in apply_series_generator(self) 284 try: 285 for i, v in enumerate(series_gen): --> 286 results[i] = self.f(v) 287 keys.append(v.name) 288 except Exception as e:

in combine(row) 2 count = 0 3 stage = "" ----> 4 if (str(row.doggo) == "doggo"): 5 stage = "doggo" 6 count += 1

~/anaconda3/lib/python3.7/site-packages/pandas/core/generic.py in getattr(self, name) 5065 if self._info_axis._can_hold_identifiers_and_holds_name(name): 5066
return self[name] -> 5067 return object.getattribute(self, name) 5068 5069 def setattr(self, name, value):

AttributeError: ("'Series' object has no attribute 'doggo'", 'occurred at index doggo')

Grzegorz Skibinski Grzegorz Skibinski · Accepted Answer · 2019-12-15T18:20:19

Try:

df_twitter_archive_clean["status"] = df_twitter_archive_clean[["doggo","floofer","pupper","puppo"]].apply(combine, axis=1)

Otherwise you apply the function column-wise and if I understand you correctly- you want it row-wise

How to apply method/function to a dataframe in python

1 Answers