index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 568 13.21 Returning a view versus a copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 568 13.21 value_counts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1586 pandas.Index.view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1586 pandas.Index value_counts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1615 pandas.CategoricalIndex.view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1615 pandas.CategoricalIndex.where

index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570 13.21 Returning a view versus a copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570 13.21 value_counts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1589 pandas.Index.view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1590 pandas.Index value_counts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1619 pandas.CategoricalIndex.view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1619 pandas.CategoricalIndex.where

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 446 13.20 Returning a view versus a copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449 iii Index dtype may not applied properly (GH11017) • Bug in io.gbq when testing for minimum google api client version (GH10652) • Bug in DataFrame construction from nested dict with timedelta keys (GH11129) dependencies on a per-method basis.(GH9713) • Updated BigQuery connector to no longer use deprecated oauth2client.tools.run() (GH8327) • Bug in subclassed DataFrame. It may not return the correct class, when slicing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286 10.20 Returning a view versus a copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289 10.21 changed. DataFrames exceeding max_rows and/or max_columns are now displayed in a centrally truncated view, consistent with the printing of a pandas.Series (GH5603). In previous versions, a DataFrame was major_xs(), Panel.minor_xs(). A view will be returned if possible, otherwise a copy will be made. Previously the user could think that copy=False would ALWAYS return a view. (GH6894) • The parallel_coordinates()

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 10.20 Returning a view versus a copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263 10.21 bar 2 bah 3 foo 4 bar [5 rows x 1 columns] 1.1.1 Output Formatting Enhancements • df.info() view now display dtype info per column (GH5682) • df.info() now honors the option max_info_rows, to disable text representations of DataFrame now show a truncated view of the table once it exceeds a certain size, rather than switching to the short info view (GH4886, GH5550). This makes the representation more

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370 12.20 Returning a view versus a copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372 13 MultiIndex the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy • merge, DataFrame.merge, and ordered_merge now return the same type as the left argument when using margins and a dict aggfunc (GH8349) • Bug in read_csv where squeeze=True would return a view (GH8217) • Bug in checking of table name in read_sql in certain cases (GH7826). • Bug in DataFrame

data analysis toolkit, Release 1.0.0 2.3.2 Viewing data See the Basics section. Here is how to view the top and bottom rows of the frame: In [13]: df.head() Out[13]: A B C D 2013-01-01 -0.521273 DataFrame(np.random.randn(8, 3), index=index, ...: columns=['A', 'B', 'C']) ...: 2.4.1 Head and tail To view a small sample of a Series or DataFrame object, use the head() and tail() methods. The default number DataFrame.to_numpy(), being a method, makes it clearer that the returned NumPy array may not be a view on the same data in the DataFrame. 2.4.3 Accelerated operations pandas has support for accelerating

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362 12.20 Returning a view versus a copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364 13 MultiIndex the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy • merge, DataFrame.merge, and ordered_merge now return the same type as the left argument when using margins and a dict aggfunc (GH8349) • Bug in read_csv where squeeze=True would return a view (GH8217) • Bug in checking of table name in read_sql in certain cases (GH7826). • Bug in DataFrame

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394 2.5.22 Returning a view versus a copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396 2.6 MultiIndex attributes have been truncated for brevity. 2.1.2 Viewing data See the Basics section. Here is how to view the top and bottom rows of the frame: In [13]: df.head() Out[13]: A B C D 2013-01-01 -0.626301 DataFrame(np.random.randn(8, 3), index=index, ...: columns=['A', 'B', 'C']) ...: 2.3.1 Head and tail To view a small sample of a Series or DataFrame object, use the head() and tail() methods. The default number

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394 2.5.22 Returning a view versus a copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396 2.6 MultiIndex attributes have been truncated for brevity. 2.1.2 Viewing data See the Basics section. Here is how to view the top and bottom rows of the frame: In [13]: df.head() Out[13]: A B C D 2013-01-01 -0.015961 DataFrame(np.random.randn(8, 3), index=index, ...: columns=['A', 'B', 'C']) ...: 2.3.1 Head and tail To view a small sample of a Series or DataFrame object, use the head() and tail() methods. The default number