Data structures for statistical computing in Python - SciPy Conferences
Data structures for statistical computing in Python - SciPy Conferences
Data structures for statistical computing in Python - SciPy Conferences
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pandas <strong>Data</strong>Frame<br />
Basically a pythonic data.frame, but with automatic data alignment!<br />
Arithmetic operations align on row and column labels.<br />
>>> data = <strong>Data</strong>Frame.fromcsv(’data’, <strong>in</strong>dex_col=None)<br />
date item price volume<br />
0 2009-12-28 GOOG 622.9 1.698e+06<br />
1 2009-12-29 GOOG 619.4 1.425e+06<br />
2 2009-12-30 GOOG 622.7 1.466e+06<br />
3 2009-12-31 GOOG 620 1.22e+06<br />
4 2009-12-28 AAPL 211.6 2.3e+07<br />
5 2009-12-29 AAPL 209.1 1.587e+07<br />
6 2009-12-30 AAPL 211.6 1.47e+07<br />
7 2009-12-31 AAPL 210.7 1.257e+07<br />
>>> df[’<strong>in</strong>d’] = df[’item’] == ’GOOG’<br />
McK<strong>in</strong>ney () Statistical <strong>Data</strong> Structures <strong>in</strong> <strong>Python</strong> <strong>SciPy</strong> 2010 11 / 31
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