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Adding a prefix to column valuesAdding leading zeros to strings of a columnAdding new column using listsAdding padding to a column of stringsBit-wise ORChanging column type to stringConditionally updating values of a DataFrameConverting all object-typed columns to categorical typeConverting column type to dateConverting column type to floatConverting column type to integerConverting K and M to numerical formConverting string categories or labels to numeric valuesEncoding categorical variablesExpanding lists vertically in a DataFrameExpanding strings vertically in a DataFrameExtracting numbers from columnFilling missing value in Index of DataFrameFiltering column values using boolean masksLogical AND operationMaking DataFrame string column lowercaseMapping True and False to 1 and 0 respectivelyMapping values of a DataFrame using a dictionaryModifying a single value in a DataFrameRemoving characters from columnsRemoving comma from column valuesRemoving first n characters from column valuesRemoving last n characters from column valuesRemoving leading substringRemoving trailing substringReplacing infinities with another value in DataFrameReplacing values in a DataFrameRounding valuesSorting categorical columnsUsing previous row to create new columns
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Sorting categorical columns in Pandas DataFrame
schedule May 20, 2023
Last updated local_offer
Tags Python●Pandas
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Consider the following DataFrame:
import pandas as pd
'class':['economy','first','business','first','economy'], 'price':[4,10,7,8,3]})df
class price0 economy 41 first 102 business 73 first 84 economy 3
The class column is a categorical with ordering (economy < business < first).
The goal is to sort the DataFrame based on the class column. To do so, we first convert class into a categorical type, and set the ordering using the second parameter. At this point, the column has not yet been sorted, and so we use sort_values() to perform the sort:
df['class'] = pd.Categorical(df['class'], ["economy", "business", "first"])df_new
class price0 economy 44 economy 32 business 71 first 103 first 8
Published by Isshin Inada
Edited by 0 others
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