5 examples of 'unique values in column pandas' in Python

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673def _unique(df, columns=None):
674 if isinstance(columns, str):
675 columns = [columns]
676 if not columns:
677 columns = df.columns.tolist()
678 info = {}
679 for col in columns:
680 values = df[col].dropna().values
681 uniques = np.unique(list(_flatten_list(values))).tolist()
682 info[col] = {'count': len(uniques), 'values': uniques}
683 return info
91def to_unique(self, column_or_columns):
92 self.__convert_column(column_or_columns, FType.unique, None)
242def unique(self, values):
243 """
244 Return unique values of Series object. Uniques are returned
245 in order of appearance.
246 Hash table-based unique, therefore does NOT sort.
247
248 Parameters
249 ----------
250 values : array, list, series or dataframe.
251 The set of values to identify unique occurrences.
252
253 Returns
254 -------
255 ndarray or ExtensionArray
256 The unique values returned as a NumPy array.
257
258 References
259 ----------
260 https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.unique.html
261
262 """
263 operation = begin_operation('unique')
264 unique_ = self._data.unique(values)
265 self.last_operation = end_operation(operation)
266
267 return unique_
280def nunique(self):
281 """
282 Find the number of unique values in each column
283
284 Returns
285 -------
286 A DataFrame
287 """
288 pass
49def remove_duplicates(df_or_series):
50 """ Remove duplicate rows or values by keeping the first of each duplicate.
51
52 Parameters
53 ----------
54 df_or_series : :any:`pandas.DataFrame` or :any:`pandas.Series`
55 Pandas object from which to drop duplicate index values.
56
57 Returns
58 -------
59 deduplicated : :any:`pandas.DataFrame` or :any:`pandas.Series`
60 The deduplicated pandas object.
61 """
62 # CalTrack 2.3.2.2
63 return df_or_series[~df_or_series.index.duplicated(keep="first")]

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