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You can use the str.title() method to capitalize the first letter of every word in a dataframe column. Here's an example:

import pandas as pd

# create a dataframe with a column of strings
df = pd.DataFrame({'text': ['hello world', 'this is a test', 'data science is fun']})

# apply the title method to the 'text' column
df['text'] = df['text'].str.title()

# print the updated dataframe
print(df)

Output:

                  text
0          Hello World
1       This Is A Test
2  Data Science Is Fun

In this example, the str.title() method is applied to the 'text' column using the df['text'].str accessor. This automatically applies the method to each string in the column. The updated 'text' column is then assigned back to the dataframe using df['text'] =, and the resulting dataframe is printed.