. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329 3.3.4 Creating a branch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329 3.3.5 Creating documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333 Building master branch documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334 3.5 Contributing to . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340 3.6.6 Delete your merged branch (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341 4 Frequently Asked Questions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331 3.3.4 Creating a branch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331 3.3.5 Creating documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335 Building master branch documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336 3.5 Contributing to . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342 3.6.6 Delete your merged branch (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343 4 Frequently Asked Questions

index and columns keywords (GH6913) In [75]: import datetime In [76]: df = DataFrame({ ....: 'Branch' : 'A A A A A B'.split(), ....: 'Buyer': 'Carl Mark Carl Carl Joe Joe'.split(), ....: 'Quantity': datetime.datetime(2013,10,7,20,0), datetime.datetime(2013,9,5,10,0)]}) ....: In [77]: df Out[77]: Branch Buyer Date PayDay Quantity 0 A Carl 2013-11-01 13:00:00 2013-10-04 00:00:00 1 1 A Mark 2013-09-01 inspect index.is_unique and raise an exception explicitly if it is False or go to a different code branch. 1.19. v0.8.0 (June 29, 2012) 207 pandas: powerful Python data analysis toolkit, Release 0.17.0

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379 3.3.4 Creating a branch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379 3.3.5 Creating documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383 3.4.2.3 Building master branch documentation . . . . . . . . . . . . . . . . . . . . . . . . 384 3.5 Contributing to the code base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393 3.6.6 Delete your merged branch (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394 4 Package overview 395

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377 3.3.4 Creating a branch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377 3.3.5 Creating documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381 3.4.2.3 Building master branch documentation . . . . . . . . . . . . . . . . . . . . . . . . 382 3.5 Contributing to the code base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391 viii 3.6.6 Delete your merged branch (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392 4 Package overview 393

Python Environment (pip) . . . . . . . . . . . . . . . . . . . . . . . . . 409 3.3.5 Creating a branch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409 3.4 Contributing documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411 3.4.2.3 Building master branch documentation . . . . . . . . . . . . . . . . . . . . . . . . 412 3.5 Contributing to the code base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421 3.6.6 Delete your merged branch (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422 4 Package overview 423

Grouper to provide this local control. In [171]: import datetime In [172]: df = pd.DataFrame({'Branch': 'A A A A A A A B'.split(), .....: 'Buyer': 'Carl Mark Carl Carl Joe Joe Joe Carl'.split(), . 12, 0), .....: datetime.datetime(2013, 12, 2, 14, 0)] .....: }) .....: In [173]: df Out[173]: Branch Buyer Quantity Date 0 A Carl 1 2013-01-01 13:00:00 (continues on next page) 3.13. Group By: split-apply-combine C compiler * Creating a Python environment * Creating a Python environment (pip) – Creating a branch • Contributing to the documentation – About the pandas documentation – Updating a pandas docstring

Grouper to provide this local control. In [171]: import datetime In [172]: df = pd.DataFrame({'Branch': 'A A A A A A A B'.split(), .....: 'Buyer': 'Carl Mark Carl Carl Joe Joe Joe Carl'.split(), . 12, 0), .....: datetime.datetime(2013, 12, 2, 14, 0)] .....: }) .....: In [173]: df Out[173]: Branch Buyer Quantity Date 0 A Carl 1 2013-01-01 13:00:00 1 A Mark 3 2013-01-01 13:05:00 2 A Carl 5 2013-10-01 C compiler * Creating a Python environment * Creating a Python environment (pip) – Creating a branch • Contributing to the documentation – About the pandas documentation – Updating a pandas docstring

Grouper to provide this local control. In [171]: import datetime In [172]: df = pd.DataFrame({'Branch': 'A A A A A A A B'.split(), .....: 'Buyer': 'Carl Mark Carl Carl Joe Joe Joe Carl'.split(), . 12, 0), .....: datetime.datetime(2013, 12, 2, 14, 0)] .....: }) .....: In [173]: df Out[173]: Branch Buyer Quantity Date 0 A Carl 1 2013-01-01 13:00:00 1 A Mark 3 2013-01-01 13:05:00 2 A Carl 5 2013-10-01 C compiler * Creating a Python environment * Creating a Python environment (pip) – Creating a branch • Contributing to the documentation – About the pandas documentation – Updating a pandas docstring

Grouper to provide this local control. In [171]: import datetime In [172]: df = pd.DataFrame({'Branch': 'A A A A A A A B'.split(), .....: 'Buyer': 'Carl Mark Carl Carl Joe Joe Joe Carl'.split(), . 12, 0), .....: datetime.datetime(2013, 12, 2, 14, 0)] .....: }) .....: In [173]: df Out[173]: Branch Buyer Quantity Date 0 A Carl 1 2013-01-01 13:00:00 1 A Mark 3 2013-01-01 13:05:00 2 A Carl 5 2013-10-01 C compiler * Creating a Python environment * Creating a Python environment (pip) – Creating a branch • Contributing to the documentation – About the pandas documentation – Updating a pandas docstring