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The memory usage of a DataFrame (including the index) is shown when accessing the info method of a DataFrame. A configuration option, display.memory_usage, specifies if the DataFrame’s memory usage will be displayed when invoking the df.info() method.

>>> df = pd.DataFrame(np.random.randn(10,3),columns=list('ABC'))
>>> df.info()
<class 'pandas.core.frame.DataFrame'>
RangeIndex: 10 entries, 0 to 9
Data columns (total 3 columns):
A    10 non-null float64
B    10 non-null float64
C    10 non-null float64
dtypes: float64(3)
memory usage: 320.0 bytes

Via pydata.org .

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