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How to use the lower() function in pandas
Maria ElijahThe 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())Convert string to lowercase
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 in thenamecolumn to lowercase.
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pandas
python
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