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chevron_leftData Manipulation Cookbook
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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Making DataFrame string column lowercase in Python

schedule Aug 10, 2023
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We can making a DataFrame string column lowercase in Python using the str.lower() method.

Examples

Consider the following DataFrame:

df = pd.DataFrame({"A": ["HELLO", "Friend"], "B": ["Sky", "ToWnEr"]})
df
A B
0 HELLO Sky
1 Friend ToWnEr

To convert strings in column "A" to lowercase:

df["A"] = df["A"].str.lower()
df
A B
0 hello Sky
1 friend ToWnEr
robocat
Published by Arthur Yanagisawa
Edited by 0 others
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