attempt to replace nose with pytest

contributing.md

@@ -1,6 +1,6 @@
 # Contributing
 
-The bottom line. Follow your Nose, or our Nose. Write-run-love tests :fist:.
+Thank you for contributing to plotly.py! 
 
 ## Code of Conduct
 
@@ -128,34 +128,34 @@ classes based on the new schema.
 We take advantage of two tools to run tests:
 
 * [`tox`](https://tox.readthedocs.io/en/latest/), which is both a virtualenv management and test tool.
-* [`nose`](https://nose.readthedocs.org/en/latest/), which is is an extension of Python's unittest
+* [`pytest`](https://docs.pytest.org/en/latest/), a powerful framework for unit testing.
 
-### Running Tests with `nose`
+### Running Tests with `pytest`
 
 Since our tests cover *all* the functionality, to prevent tons of errors from showing up and having to parse through a messy output, you'll need to install `optional-requirements.txt` as explained above.
 
-After you've done that, go ahead and follow (y)our Nose!
+After you've done that, go ahead and run the test suite!
 
 ```bash
-nosetests -w  packages/python/plotly/plotly/tests/
+pytest  packages/python/plotly/plotly/tests/
 ```
 
 Or for more *verbose* output:
 
 ```bash
-nosetests -w  packages/python/plotly/plotly/tests/ -v
+pytest -v  packages/python/plotly/plotly/tests/
 ```
 
 Either of those will run *every* test we've written for the Python API. You can get more granular by running something like:
 
 ```bash
-nosetests -w  packages/python/plotly/plotly/tests/test_core/
+pytest  packages/python/plotly/plotly/tests/test_core/
 ```
 
 ... or even more granular by running something like:
 
 ```bash
-nosetests plotly/tests/test_plotly/test_plot.py
+pytest plotly/tests/test_plotly/test_plot.py
 ```
 
 ### Running tests with `tox`
@@ -187,16 +187,16 @@ Where `TOXENV` is the environment list you want to use when invoking `tox` from
 * `tox` will automatically manage a virtual env for each environment you want to test in.
 * You only have to run `tox` and know that the module is working in both `Python 2` and `Python 3`.
 
-Finally, `tox` allows you to pass in additional command line arguments that are formatted in (by us) in the `tox.ini` file, see `{posargs}`. This is setup to help with our `nose attr` configuration. To run only tests that are *not* tagged with `slow`, you could use the following command:
+Finally, `tox` allows you to pass in additional command line arguments that are formatted in (by us) in the `tox.ini` file, see `{posargs}`. This is setup to help with our configuration of [pytest markers](http://doc.pytest.org/en/latest/example/markers.html), which are set up in `packages/python/plotly/pytest.ini`. To run only tests that are *not* tagged with `nodev`, you could use the following command:
 
 ```bash
-tox -- -a '!slow'
+tox -- -a '!nodev'
 ```
 
-Note that anything after `--` is substituted in for `{posargs}` in the tox.ini. For completeness, because it's reasonably confusing, if you want to force a match for *multiple* `nose attr` tags, you comma-separate the tags like so:
+Note that anything after `--` is substituted in for `{posargs}` in the tox.ini. For completeness, because it's reasonably confusing, if you want to force a match for *multiple* `pytest` marker tags, you comma-separate the tags like so:
 
 ```bash
-tox -- -a '!slow','!matplotlib'
+tox -- -a '!nodev','!matplotlib'
 ```
 
 ### Writing Tests

packages/python/chart-studio/tox.ini

@@ -24,15 +24,14 @@
 ; PASSING ADDITONAL ARGUMENTS TO TEST COMMANDS
 ; The {posargs} is tox-specific and passes in any command line args after `--`.
 ; For example, given the testing command in *this* file:
-;   nosetests {posargs} -x plotly/tests/test_core
+;   pytest {posargs} -x plotly/tests/test_core
 ;
 ; The following command:
-;   tox -- -a '!slow'
+;   tox -- -k 'not nodev'
 ;
 ; Tells tox to call:
-;   nosetests -a '!slow' -x plotly/tests/test_core
+;   pytest -k 'not nodev' -x plotly/tests/test_core
 ;
-; Which is a nice way to skip slow tests for faster testing cycles.
 
 [tox]
 ; The py{A,B,C}-{X,Y} generates a matrix of envs:
@@ -72,16 +71,16 @@ deps=
 basepython={env:PLOTLY_TOX_PYTHON_27:}
 commands=
     python --version
-    nosetests {posargs} -x chart_studio/tests/
+    pytest {posargs} -x chart_studio/tests/
 
 [testenv:py35-plot_ly]
 basepython={env:PLOTLY_TOX_PYTHON_35:}
 commands=
     python --version
-    nosetests {posargs} -x chart_studio/tests/
+    pytest {posargs} -x chart_studio/tests/
 
 [testenv:py37-plot_ly]
 basepython={env:PLOTLY_TOX_PYTHON_37:}
 commands=
     python --version
-    nosetests {posargs} -x chart_studio/tests/
+    pytest {posargs} -x chart_studio/tests/

packages/python/plotly/optional-requirements.txt

@@ -14,7 +14,6 @@ numpy
 ## testing dependencies ##
 coverage==4.3.1
 mock==2.0.0
-nose==1.3.3
 pytest==3.5.1
 backports.tempfile==1.0
 xarray

packages/python/plotly/tox.ini

@@ -24,15 +24,14 @@
 ; PASSING ADDITONAL ARGUMENTS TO TEST COMMANDS
 ; The {posargs} is tox-specific and passes in any command line args after `--`.
 ; For example, given the testing command in *this* file:
-;   nosetests {posargs} -x plotly/tests/test_core
+;   pytest {posargs} -x plotly/tests/test_core
 ;
 ; The following command:
-;   tox -- -a '!slow'
+;   tox -- -k 'not nodev'
 ;
 ; Tells tox to call:
-;   nosetests -a '!slow' -x plotly/tests/test_core
+;   pytest -k 'not nodev' -x plotly/tests/test_core
 ;
-; Which is a nice way to skip slow tests for faster testing cycles.
 
 [tox]
 ; The py{A,B,C}-{X,Y} generates a matrix of envs: