analysis toolkit Release 0.21.1 Wes McKinney & PyData Development Team Dec 12, 2017 CONTENTS 1 What’s New 3 1.1 v0.21.1 (December 12, 2017) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 pd.unique will now be consistent with extension types . . . . . . . . . . . . . . . . 54 1.5.2.5 S3 File Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 1.5.2.6 Partial . . . . . . . . . . . . . . . . . . . . . . . 400 2.2.4 Installing using your Linux distribution’s package manager. . . . . . . . . . . . . . . . . . . 400 2.2.5 Installing from source . . . . . .

CONTENTS 1 pandas: powerful Python data analysis toolkit, Release 1.0.0 2 CONTENTS CHAPTER ONE WHAT’S NEW IN 1.0.0 (JANUARY 29, 2020) These are the changes in pandas 1.0.0. See release for a full changelog using the nullable integer dtype: In [3]: s = pd.Series([1, 2, None], dtype="Int64") In [4]: s Out[4]: 0 1 1 2 2 Length: 3, dtype: Int64 In [5]: s[2] Out[5]: Compared to np.nan, pd.NA operations, pd.NA also propagates as “missing” or “unknown” in comparison operations: 4 Chapter 1. What’s new in 1.0.0 (January 29, 2020) pandas: powerful Python data analysis toolkit, Release 1.0.0 In [6]:

the overview for more detail about what’s in the library. CONTENTS 1 pandas: powerful Python data analysis toolkit, Release 0.25.1 2 CONTENTS CHAPTER ONE WHAT’S NEW IN 0.25.0 (JULY 18, 2019) Warning: when renaming). A similar approach is now available for Series groupby objects as well. Because there’s no need for column selection, the values can just be the functions to apply In [5]: animals.groupby("kind") Out[5]: min_height max_height kind cat 9.1 9.5 dog 6.0 34.0 [2 rows x 2 columns] 4 Chapter 1. What’s new in 0.25.0 (July 18, 2019) pandas: powerful Python data analysis toolkit, Release 0.25.1 This type

the overview for more detail about what’s in the library. CONTENTS 1 pandas: powerful Python data analysis toolkit, Release 0.25.0 2 CONTENTS CHAPTER ONE WHAT’S NEW IN 0.25.0 (JULY 18, 2019) Warning: when renaming). A similar approach is now available for Series groupby objects as well. Because there’s no need for column selection, the values can just be the functions to apply In [5]: animals.groupby("kind") recommended alternative to the deprecated behavior when passing a dict to a Series 4 Chapter 1. What’s new in 0.25.0 (July 18, 2019) pandas: powerful Python data analysis toolkit, Release 0.25.0 groupby

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569 2.8.11 Differences to R’s factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570 2.8.12 Gotchas . . . . . . . . . . . . . . 2389 5.1.1 What’s new in 1.0.5 (June 17, 2020) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2389 5.1.2 What’s new in 1.0.4 (May 28, 2020) . . . . . . . . . . . . . . . . . . . . . . . 2390 5.1.3 What’s new in 1.0.3 (March 17, 2020) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2391 5.1.4 What’s new in 1.0.2 (March 12, 2020) . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 568 2.8.11 Differences to R’s factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569 2.8.12 Gotchas . . . . . . . . . . . . . . . 2385 5.1.1 What’s new in 1.0.4 (May 28, 2020) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2385 5.1.2 What’s new in 1.0.3 (March 17, 2020) . . . . . . . . . . . . . . . . . . . . . . 2387 5.1.3 What’s new in 1.0.2 (March 12, 2020) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2387 5.1.4 What’s new in 1.0.1 (February 5, 2020) . . . . . . .

toolkit Release 1.0.3 Wes McKinney and the Pandas Development Team Mar 18, 2020 CONTENTS 1 What’s new in 1.0.1 (February 5, 2020) 3 1.1 Fixed regressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570 3.8.11 Differences to R’s factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 571 3.8.12 Gotchas . . . . . . . . . . . . . . . 2375 6.1.1 What’s new in 1.0.3 (March 17, 2020) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2375 6.1.2 What’s new in 1.0.2 (March 12, 2020) . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 663 2.12.11 Differences to R’s factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664 2.12.12 Gotchas . . . . . . . . . . . . . . . . 2761 5.1.1 What’s new in 1.3.3 (September 12, 2021) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2761 5.1.2 What’s new in 1.3.2 (August 15, 2021) . . . . . . . . . . . . . . . . . . . 2763 x 5.1.3 What’s new in 1.3.1 (July 25, 2021) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2764 5.1.4 What’s new in 1.3.0 (July 2, 2021) . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664 2.12.11 Differences to R’s factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 665 2.12.12 Gotchas . . . . . . . . . . . . . . . . 2761 5.1.1 What’s new in 1.3.4 (October 17, 2021) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2761 5.1.2 What’s new in 1.3.3 (September 12, 2021) . . . . . . . . . . . . . . . . . . 2763 x 5.1.3 What’s new in 1.3.2 (August 15, 2021) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2764 5.1.4 What’s new in 1.3.1 (July 25, 2021) . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 666 2.12.11 Differences to R’s factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 667 2.12.12 Gotchas . . . . . . . . . . . . . . . 2857 5.1.1 What’s new in 1.4.4 (August 31, 2022) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2857 5.1.2 What’s new in 1.4.3 (June 23, 2022) . . . . . . . . . . . . . . . . . . . . 2859 x 5.1.3 What’s new in 1.4.2 (April 2, 2022) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2861 5.1.4 What’s new in 1.4.1 (February 12, 2022) . . . . . .