Web Reference: They are the same as long you're accessing a single column with a simple name, but you can do more with the bracket notation. You can only use df.col if the column name is a valid Python identifier (e.g., does not contains spaces and other such stuff). Sep 13, 2019 · There are two ways to select a Series from a DataFrame: "dot notation" and "bracket notation" (square brackets). Find out which one you should use, and why! Feb 23, 2026 · Key point: Standard Python dictionaries don't support dot notation. Only special objects like pandas DataFrames allow both syntaxes. Square bracket notation is essential when column names are stored in variables or generated dynamically: 'AAPL': [185.64, 186.89, 185.92], 'MSFT': [372.55, 375.23, 373.89], 'GOOGL': [145.23, 146.78, 145.67]
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