Creating an empty Pandas DataFrame, and then filling it

import pandas as pd

# create an empty DataFrame
df = pd.DataFrame()

# add data to the DataFrame
df['name'] = ['John', 'Jane', 'Bob']
df['age'] = [30, 25, 35]
df['city'] = ['New York', 'Los Angeles', 'Chicago']


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Note that in above example, the DataFrame is created empty first, and then columns are added one by one using the assignment operator (=). The column names are specified as strings inside square brackets ([]). The column data is added as a list.