Use https for links where available (pandas-dev#31145)

.github/CODE_OF_CONDUCT.md

@@ -54,10 +54,10 @@ incident.
 
 This Code of Conduct is adapted from the [Contributor Covenant][homepage],
 version 1.3.0, available at
-[http://contributor-covenant.org/version/1/3/0/][version],
+[https://www.contributor-covenant.org/version/1/3/0/][version],
 and the [Swift Code of Conduct][swift].
 
-[homepage]: http://contributor-covenant.org
-[version]: http://contributor-covenant.org/version/1/3/0/
+[homepage]: https://www.contributor-covenant.org
+[version]: https://www.contributor-covenant.org/version/1/3/0/
 [swift]: https://swift.org/community/#code-of-conduct
 

.github/CONTRIBUTING.md

@@ -16,7 +16,7 @@ If you notice a bug in the code or documentation, or have suggestions for how we
 
 ## Contributing to the Codebase
 
-The code is hosted on [GitHub](https://www.github.com/pandas-dev/pandas), so you will need to use [Git](http://git-scm.com/) to clone the project and make changes to the codebase. Once you have obtained a copy of the code, you should create a development environment that is separate from your existing Python environment so that you can make and test changes without compromising your own work environment. For more information, please refer to the "[Working with the code](https://github.com/pandas-dev/pandas/blob/master/doc/source/development/contributing.rst#working-with-the-code)" section.
+The code is hosted on [GitHub](https://www.github.com/pandas-dev/pandas), so you will need to use [Git](https://git-scm.com/) to clone the project and make changes to the codebase. Once you have obtained a copy of the code, you should create a development environment that is separate from your existing Python environment so that you can make and test changes without compromising your own work environment. For more information, please refer to the "[Working with the code](https://github.com/pandas-dev/pandas/blob/master/doc/source/development/contributing.rst#working-with-the-code)" section.
 
 Before submitting your changes for review, make sure to check that your changes do not break any tests. You can find more information about our test suites in the "[Test-driven development/code writing](https://github.com/pandas-dev/pandas/blob/master/doc/source/development/contributing.rst#test-driven-development-code-writing)" section. We also have guidelines regarding coding style that will be enforced during testing, which can be found in the "[Code standards](https://github.com/pandas-dev/pandas/blob/master/doc/source/development/contributing.rst#code-standards)" section.
 

AUTHORS.md

@@ -14,7 +14,7 @@ About the Copyright Holders
     The PyData Development Team is the collection of developers of the PyData
     project. This includes all of the PyData sub-projects, including pandas. The
     core team that coordinates development on GitHub can be found here:
-    http://github.com/pydata.
+    https://github.com/pydata.
 
 Full credits for pandas contributors can be found in the documentation.
 

RELEASE.md

@@ -3,4 +3,4 @@ Release Notes
 
 The list of changes to Pandas between each release can be found
 [here](https://pandas.pydata.org/pandas-docs/stable/whatsnew/index.html). For full
-details, see the commit logs at http://github.com/pandas-dev/pandas.
+details, see the commit logs at https://github.com/pandas-dev/pandas.

asv_bench/benchmarks/pandas_vb_common.py

@@ -56,7 +56,7 @@
 def setup(*args, **kwargs):
     # This function just needs to be imported into each benchmark file to
     # set up the random seed before each function.
-    # http://asv.readthedocs.io/en/latest/writing_benchmarks.html
+    # https://asv.readthedocs.io/en/latest/writing_benchmarks.html
     np.random.seed(1234)
 
 

doc/cheatsheet/README.txt

@@ -5,4 +5,4 @@ and pick "PDF" as the format.
 This cheat sheet was inspired by the RStudio Data Wrangling Cheatsheet[1], written by Irv Lustig, Princeton Consultants[2].
 
 [1]: https://www.rstudio.com/wp-content/uploads/2015/02/data-wrangling-cheatsheet.pdf
-[2]: http://www.princetonoptimization.com/
+[2]: https://www.princetonoptimization.com/

doc/source/conf.py

@@ -408,7 +408,7 @@
         "py": ("https://pylib.readthedocs.io/en/latest/", None),
         "python": ("https://docs.python.org/3/", None),
         "scipy": ("https://docs.scipy.org/doc/scipy/reference/", None),
-        "statsmodels": ("http://www.statsmodels.org/devel/", None),
+        "statsmodels": ("https://www.statsmodels.org/devel/", None),
     }
 
 # extlinks alias
@@ -625,10 +625,10 @@ def linkcode_resolve(domain, info):
     fn = os.path.relpath(fn, start=os.path.dirname(pandas.__file__))
 
     if "+" in pandas.__version__:
-        return f"http://github.com/pandas-dev/pandas/blob/master/pandas/{fn}{linespec}"
+        return f"https://github.com/pandas-dev/pandas/blob/master/pandas/{fn}{linespec}"
     else:
         return (
-            f"http://github.com/pandas-dev/pandas/blob/"
+            f"https://github.com/pandas-dev/pandas/blob/"
             f"v{pandas.__version__}/pandas/{fn}{linespec}"
         )
 
@@ -695,7 +695,7 @@ def rstjinja(app, docname, source):
     """
     Render our pages as a jinja template for fancy templating goodness.
     """
-    # http://ericholscher.com/blog/2016/jul/25/integrating-jinja-rst-sphinx/
+    # https://www.ericholscher.com/blog/2016/jul/25/integrating-jinja-rst-sphinx/
     # Make sure we're outputting HTML
     if app.builder.format != "html":
         return

doc/source/development/contributing.rst

@@ -56,7 +56,7 @@ Bug reports and enhancement requests
 Bug reports are an important part of making *pandas* more stable. Having a complete bug report
 will allow others to reproduce the bug and provide insight into fixing. See
 `this stackoverflow article <https://stackoverflow.com/help/mcve>`_ and
-`this blogpost <http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports>`_
+`this blogpost <https://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports>`_
 for tips on writing a good bug report.
 
 Trying the bug-producing code out on the *master* branch is often a worthwhile exercise
@@ -67,7 +67,7 @@ Bug reports must:
 
 #. Include a short, self-contained Python snippet reproducing the problem.
    You can format the code nicely by using `GitHub Flavored Markdown
-   <http://github.github.com/github-flavored-markdown/>`_::
+   <https://github.github.com/github-flavored-markdown/>`_::
 
       ```python
       >>> from pandas import DataFrame
@@ -104,19 +104,19 @@ feel free to ask for help.
 
 The code is hosted on `GitHub <https://www.github.com/pandas-dev/pandas>`_. To
 contribute you will need to sign up for a `free GitHub account
-<https://github.com/signup/free>`_. We use `Git <http://git-scm.com/>`_ for
+<https://github.com/signup/free>`_. We use `Git <https://git-scm.com/>`_ for
 version control to allow many people to work together on the project.
 
 Some great resources for learning Git:
 
-* the `GitHub help pages <http://help.github.com/>`_.
-* the `NumPy's documentation <http://docs.scipy.org/doc/numpy/dev/index.html>`_.
-* Matthew Brett's `Pydagogue <http://matthew-brett.github.com/pydagogue/>`_.
+* the `GitHub help pages <https://help.github.com/>`_.
+* the `NumPy's documentation <https://docs.scipy.org/doc/numpy/dev/index.html>`_.
+* Matthew Brett's `Pydagogue <https://matthew-brett.github.com/pydagogue/>`_.
 
 Getting started with Git
 ------------------------
 
-`GitHub has instructions <http://help.github.com/set-up-git-redirect>`__ for installing git,
+`GitHub has instructions <https://help.github.com/set-up-git-redirect>`__ for installing git,
 setting up your SSH key, and configuring git.  All these steps need to be completed before
 you can work seamlessly between your local repository and GitHub.
 
@@ -260,7 +260,7 @@ To return to your root environment::
 
       conda deactivate
 
-See the full conda docs `here <http://conda.pydata.org/docs>`__.
+See the full conda docs `here <https://conda.pydata.org/docs>`__.
 
 .. _contributing.pip:
 
@@ -365,7 +365,7 @@ About the *pandas* documentation
 --------------------------------
 
 The documentation is written in **reStructuredText**, which is almost like writing
-in plain English, and built using `Sphinx <http://www.sphinx-doc.org/en/master/>`__. The
+in plain English, and built using `Sphinx <https://www.sphinx-doc.org/en/master/>`__. The
 Sphinx Documentation has an excellent `introduction to reST
 <https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html>`__. Review the Sphinx docs to perform more
 complex changes to the documentation as well.
@@ -390,7 +390,7 @@ Some other important things to know about the docs:
      contributing_docstring.rst
 
 * The tutorials make heavy use of the `ipython directive
-  <http://matplotlib.org/sampledoc/ipython_directive.html>`_ sphinx extension.
+  <https://matplotlib.org/sampledoc/ipython_directive.html>`_ sphinx extension.
   This directive lets you put code in the documentation which will be run
   during the doc build. For example::
 
@@ -436,7 +436,7 @@ Some other important things to know about the docs:
     The ``.rst`` files are used to automatically generate Markdown and HTML versions
     of the docs. For this reason, please do not edit ``CONTRIBUTING.md`` directly,
     but instead make any changes to ``doc/source/development/contributing.rst``. Then, to
-    generate ``CONTRIBUTING.md``, use `pandoc <http://johnmacfarlane.net/pandoc/>`_
+    generate ``CONTRIBUTING.md``, use `pandoc <https://johnmacfarlane.net/pandoc/>`_
     with the following command::
 
       pandoc doc/source/development/contributing.rst -t markdown_github > CONTRIBUTING.md
@@ -620,8 +620,8 @@ You can also run this command on an entire directory if necessary::
    cpplint --extensions=c,h --headers=h --filter=-readability/casting,-runtime/int,-build/include_subdir --recursive modified-c-directory
 
 To make your commits compliant with this standard, you can install the
-`ClangFormat <http://clang.llvm.org/docs/ClangFormat.html>`_ tool, which can be
-downloaded `here <http://llvm.org/builds/>`__. To configure, in your home directory,
+`ClangFormat <https://clang.llvm.org/docs/ClangFormat.html>`_ tool, which can be
+downloaded `here <https://llvm.org/builds/>`__. To configure, in your home directory,
 run the following command::
 
     clang-format style=google -dump-config  > .clang-format
@@ -651,7 +651,7 @@ fixes manually.
 Python (PEP8 / black)
 ~~~~~~~~~~~~~~~~~~~~~
 
-*pandas* follows the `PEP8 <http://www.python.org/dev/peps/pep-0008/>`_ standard
+*pandas* follows the `PEP8 <https://www.python.org/dev/peps/pep-0008/>`_ standard
 and uses `Black <https://black.readthedocs.io/en/stable/>`_ and
 `Flake8 <http://flake8.pycqa.org/en/latest/>`_ to ensure a consistent code
 format throughout the project.
@@ -971,9 +971,9 @@ Adding tests is one of the most common requests after code is pushed to *pandas*
 it is worth getting in the habit of writing tests ahead of time so this is never an issue.
 
 Like many packages, *pandas* uses `pytest
-<http://docs.pytest.org/en/latest/>`_ and the convenient
+<https://docs.pytest.org/en/latest/>`_ and the convenient
 extensions in `numpy.testing
-<http://docs.scipy.org/doc/numpy/reference/routines.testing.html>`_.
+<https://docs.scipy.org/doc/numpy/reference/routines.testing.html>`_.
 
 .. note::
 
@@ -1024,7 +1024,7 @@ Transitioning to ``pytest``
     class TestReallyCoolFeature:
         pass
 
-Going forward, we are moving to a more *functional* style using the `pytest <http://docs.pytest.org/en/latest/>`__ framework, which offers a richer testing
+Going forward, we are moving to a more *functional* style using the `pytest <https://docs.pytest.org/en/latest/>`__ framework, which offers a richer testing
 framework that will facilitate testing and developing. Thus, instead of writing test classes, we will write test functions like this:
 
 .. code-block:: python
@@ -1257,7 +1257,7 @@ On Windows, one can type::
 This can significantly reduce the time it takes to locally run tests before
 submitting a pull request.
 
-For more, see the `pytest <http://docs.pytest.org/en/latest/>`_ documentation.
+For more, see the `pytest <https://docs.pytest.org/en/latest/>`_ documentation.
 
 Furthermore one can run
 

doc/source/development/contributing_docstring.rst

@@ -77,8 +77,8 @@ language that allows encoding styles in plain text files. Documentation
 about reStructuredText can be found in:
 
 * `Sphinx reStructuredText primer <https://www.sphinx-doc.org/en/stable/rest.html>`_
-* `Quick reStructuredText reference <http://docutils.sourceforge.net/docs/user/rst/quickref.html>`_
-* `Full reStructuredText specification <http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html>`_
+* `Quick reStructuredText reference <https://docutils.sourceforge.io/docs/user/rst/quickref.html>`_
+* `Full reStructuredText specification <https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html>`_
 
 Pandas has some helpers for sharing docstrings between related classes, see
 :ref:`docstring.sharing`.

doc/source/development/extending.rst

@@ -306,7 +306,7 @@ Subclassing pandas data structures
 
   1. Extensible method chains with :ref:`pipe <basics.pipe>`
 
-  2. Use *composition*. See `here <http://en.wikipedia.org/wiki/Composition_over_inheritance>`_.
+  2. Use *composition*. See `here <https://en.wikipedia.org/wiki/Composition_over_inheritance>`_.
 
   3. Extending by :ref:`registering an accessor <extending.register-accessors>`
 

doc/source/development/maintaining.rst

@@ -36,7 +36,7 @@ of what it means to be a maintainer.
 * Provide experience / wisdom on API design questions to ensure consistency and maintainability
 * Project organization (run / attend developer meetings, represent pandas)
 
-http://matthewrocklin.com/blog/2019/05/18/maintainer may be interesting background
+https://matthewrocklin.com/blog/2019/05/18/maintainer may be interesting background
 reading.
 
 .. _maintaining.triage:
@@ -78,7 +78,7 @@ Here's a typical workflow for triaging a newly opened issue.
 4. **Is the issue minimal and reproducible**?
 
    For bug reports, we ask that the reporter provide a minimal reproducible
-   example. See http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports
+   example. See https://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports
    for a good explanation. If the example is not reproducible, or if it's
    *clearly* not minimal, feel free to ask the reporter if they can provide
    and example or simplify the provided one. Do acknowledge that writing

doc/source/ecosystem.rst

@@ -303,8 +303,8 @@ dimensional arrays, rather than the tabular data for which pandas excels.
 Out-of-core
 -------------
 
-`Blaze <http://blaze.pydata.org/>`__
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+`Blaze <https://blaze.pydata.org/>`__
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Blaze provides a standard API for doing computations with various
 in-memory and on-disk backends: NumPy, Pandas, SQLAlchemy, MongoDB, PyTables,

doc/source/getting_started/comparison/comparison_with_r.rst

@@ -6,9 +6,9 @@ Comparison with R / R libraries
 *******************************
 
 Since ``pandas`` aims to provide a lot of the data manipulation and analysis
-functionality that people use `R <http://www.r-project.org/>`__ for, this page
+functionality that people use `R <https://www.r-project.org/>`__ for, this page
 was started to provide a more detailed look at the `R language
-<http://en.wikipedia.org/wiki/R_(programming_language)>`__ and its many third
+<https://en.wikipedia.org/wiki/R_(programming_language)>`__ and its many third
 party libraries as they relate to ``pandas``. In comparisons with R and CRAN
 libraries, we care about the following things:
 
@@ -517,37 +517,37 @@ For more details and examples see :ref:`categorical introduction <categorical>`
 
 
 .. |c| replace:: ``c``
-.. _c: http://stat.ethz.ch/R-manual/R-patched/library/base/html/c.html
+.. _c: https://stat.ethz.ch/R-manual/R-patched/library/base/html/c.html
 
 .. |aggregate| replace:: ``aggregate``
-.. _aggregate: http://finzi.psych.upenn.edu/R/library/stats/html/aggregate.html
+.. _aggregate: https://stat.ethz.ch/R-manual/R-patched/library/stats/html/aggregate.html
 
 .. |match| replace:: ``match`` / ``%in%``
-.. _match: http://finzi.psych.upenn.edu/R/library/base/html/match.html
+.. _match: https://stat.ethz.ch/R-manual/R-patched/library/base/html/match.html
 
 .. |tapply| replace:: ``tapply``
-.. _tapply: http://finzi.psych.upenn.edu/R/library/base/html/tapply.html
+.. _tapply: https://stat.ethz.ch/R-manual/R-patched/library/base/html/tapply.html
 
 .. |with| replace:: ``with``
-.. _with: http://finzi.psych.upenn.edu/R/library/base/html/with.html
+.. _with: https://stat.ethz.ch/R-manual/R-patched/library/base/html/with.html
 
 .. |subset| replace:: ``subset``
-.. _subset: http://finzi.psych.upenn.edu/R/library/base/html/subset.html
+.. _subset: https://stat.ethz.ch/R-manual/R-patched/library/base/html/subset.html
 
 .. |ddply| replace:: ``ddply``
-.. _ddply: http://www.inside-r.org/packages/cran/plyr/docs/ddply
+.. _ddply: https://cran.r-project.org/web/packages/plyr/plyr.pdf#Rfn.ddply.1
 
 .. |meltarray| replace:: ``melt.array``
-.. _meltarray: http://www.inside-r.org/packages/cran/reshape2/docs/melt.array
+.. _meltarray: https://cran.r-project.org/web/packages/reshape2/reshape2.pdf#Rfn.melt.array.1
 
 .. |meltlist| replace:: ``melt.list``
-.. meltlist: http://www.inside-r.org/packages/cran/reshape2/docs/melt.list
+.. meltlist: https://cran.r-project.org/web/packages/reshape2/reshape2.pdf#Rfn.melt.list.1
 
 .. |meltdf| replace:: ``melt.data.frame``
-.. meltdf: http://www.inside-r.org/packages/cran/reshape2/docs/melt.data.frame
+.. meltdf: https://cran.r-project.org/web/packages/reshape2/reshape2.pdf#Rfn.melt.data.frame.1
 
 .. |cast| replace:: ``cast``
-.. cast: http://www.inside-r.org/packages/cran/reshape2/docs/cast
+.. cast: https://cran.r-project.org/web/packages/reshape2/reshape2.pdf#Rfn.cast.1
 
 .. |factor| replace:: ``factor``
 .. _factor: https://stat.ethz.ch/R-manual/R-devel/library/base/html/factor.html

doc/source/getting_started/comparison/comparison_with_stata.rst

@@ -673,6 +673,6 @@ Disk vs memory
 Pandas and Stata both operate exclusively in memory. This means that the size of
 data able to be loaded in pandas is limited by your machine's memory.
 If out of core processing is needed, one possibility is the
-`dask.dataframe <http://dask.pydata.org/en/latest/dataframe.html>`_
+`dask.dataframe <https://dask.pydata.org/en/latest/dataframe.html>`_
 library, which provides a subset of pandas functionality for an
 on-disk ``DataFrame``.

doc/source/getting_started/dsintro.rst

@@ -609,7 +609,7 @@ union of the column and row labels.
 
 When doing an operation between DataFrame and Series, the default behavior is
 to align the Series **index** on the DataFrame **columns**, thus `broadcasting
-<http://docs.scipy.org/doc/numpy/user/basics.broadcasting.html>`__
+<https://docs.scipy.org/doc/numpy/user/basics.broadcasting.html>`__
 row-wise. For example:
 
 .. ipython:: python