text_plain_output_1.png
import pandas as pd

import pandas as pd # data processing, CSV file I/O (e.g. pd.read_csv)

df = pd.read_csv('../input/911.csv')

df['Reason'] = df['title'].apply(lambda title: title.split(':')[0])

df['Departments'] = df['title'].apply(lambda title: title.split(':')[1])

df['Reason'].value_counts().head(1)