How to use the lower() function in pandas

The lower() function

The pandas lower() function is used to convert all characters in a string to lowercase.

Syntax

dataframe["columnname"][index].lower()

Note: You cannot apply the lower() function on the entire column of a DataFrame.

Example

The following code shows how to use the lower() function:

import pandas as pd
# Create a DataFrame
df = pd.DataFrame({
    "name": ["Maria","Paul","Eva","Oliver","Sebastian","Camila"],
    "age":[20,22,32,26,29,30],
    "salary":[2000,2500,4000,3500,4200,3000],
    "gender":["female","male","female","male","male"
    ,"female"]
})
# Convert string to lowercase using lower()
print(df["name"][4].lower())

Explanation

In the code above:

  • Line 1: We import the pandas library.

  • Lines 4–10: We create a DataFrame, df, from a dictionary.

  • Line 13: We use the lower() function to convert the name at index 44 in the name column to lowercase.

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