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test_pylabtools.py
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test_pylabtools.py
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"""Tests for pylab tools module.
"""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
from binascii import a2b_base64
from io import BytesIO
import pytest
matplotlib = pytest.importorskip("matplotlib")
matplotlib.use('Agg')
from matplotlib.figure import Figure
from matplotlib import pyplot as plt
from matplotlib_inline import backend_inline
import numpy as np
from IPython.core.getipython import get_ipython
from IPython.core.interactiveshell import InteractiveShell
from IPython.core.display import _PNG, _JPEG
from .. import pylabtools as pt
from IPython.testing import decorators as dec
def test_figure_to_svg():
# simple empty-figure test
fig = plt.figure()
assert pt.print_figure(fig, "svg") is None
plt.close('all')
# simple check for at least svg-looking output
fig = plt.figure()
ax = fig.add_subplot(1,1,1)
ax.plot([1,2,3])
plt.draw()
svg = pt.print_figure(fig, "svg")[:100].lower()
assert "doctype svg" in svg
def _check_pil_jpeg_bytes():
"""Skip if PIL can't write JPEGs to BytesIO objects"""
# PIL's JPEG plugin can't write to BytesIO objects
# Pillow fixes this
from PIL import Image
buf = BytesIO()
img = Image.new("RGB", (4,4))
try:
img.save(buf, 'jpeg')
except Exception as e:
ename = e.__class__.__name__
raise pytest.skip("PIL can't write JPEG to BytesIO: %s: %s" % (ename, e)) from e
@dec.skip_without("PIL.Image")
def test_figure_to_jpeg():
_check_pil_jpeg_bytes()
# simple check for at least jpeg-looking output
fig = plt.figure()
ax = fig.add_subplot(1,1,1)
ax.plot([1,2,3])
plt.draw()
jpeg = pt.print_figure(fig, 'jpeg', pil_kwargs={'optimize': 50})[:100].lower()
assert jpeg.startswith(_JPEG)
def test_retina_figure():
# simple empty-figure test
fig = plt.figure()
assert pt.retina_figure(fig) == None
plt.close('all')
fig = plt.figure()
ax = fig.add_subplot(1,1,1)
ax.plot([1,2,3])
plt.draw()
png, md = pt.retina_figure(fig)
assert png.startswith(_PNG)
assert "width" in md
assert "height" in md
_fmt_mime_map = {
'png': 'image/png',
'jpeg': 'image/jpeg',
'pdf': 'application/pdf',
'retina': 'image/png',
'svg': 'image/svg+xml',
}
def test_select_figure_formats_str():
ip = get_ipython()
for fmt, active_mime in _fmt_mime_map.items():
pt.select_figure_formats(ip, fmt)
for mime, f in ip.display_formatter.formatters.items():
if mime == active_mime:
assert Figure in f
else:
assert Figure not in f
def test_select_figure_formats_kwargs():
ip = get_ipython()
kwargs = dict(bbox_inches="tight")
pt.select_figure_formats(ip, "png", **kwargs)
formatter = ip.display_formatter.formatters["image/png"]
f = formatter.lookup_by_type(Figure)
cell = f.keywords
expected = kwargs
expected["base64"] = True
expected["fmt"] = "png"
assert cell == expected
# check that the formatter doesn't raise
fig = plt.figure()
ax = fig.add_subplot(1,1,1)
ax.plot([1,2,3])
plt.draw()
formatter.enabled = True
png = formatter(fig)
assert isinstance(png, str)
png_bytes = a2b_base64(png)
assert png_bytes.startswith(_PNG)
def test_select_figure_formats_set():
ip = get_ipython()
for fmts in [
{'png', 'svg'},
['png'],
('jpeg', 'pdf', 'retina'),
{'svg'},
]:
active_mimes = {_fmt_mime_map[fmt] for fmt in fmts}
pt.select_figure_formats(ip, fmts)
for mime, f in ip.display_formatter.formatters.items():
if mime in active_mimes:
assert Figure in f
else:
assert Figure not in f
def test_select_figure_formats_bad():
ip = get_ipython()
with pytest.raises(ValueError):
pt.select_figure_formats(ip, 'foo')
with pytest.raises(ValueError):
pt.select_figure_formats(ip, {'png', 'foo'})
with pytest.raises(ValueError):
pt.select_figure_formats(ip, ['retina', 'pdf', 'bar', 'bad'])
def test_import_pylab():
ns = {}
pt.import_pylab(ns, import_all=False)
assert "plt" in ns
assert ns["np"] == np
class TestPylabSwitch(object):
class Shell(InteractiveShell):
def init_history(self):
"""Sets up the command history, and starts regular autosaves."""
self.config.HistoryManager.hist_file = ":memory:"
super().init_history()
def enable_gui(self, gui):
pass
def setup(self):
import matplotlib
def act_mpl(backend):
matplotlib.rcParams['backend'] = backend
# Save rcParams since they get modified
self._saved_rcParams = matplotlib.rcParams
self._saved_rcParamsOrig = matplotlib.rcParamsOrig
matplotlib.rcParams = dict(backend="QtAgg")
matplotlib.rcParamsOrig = dict(backend="QtAgg")
# Mock out functions
self._save_am = pt.activate_matplotlib
pt.activate_matplotlib = act_mpl
self._save_ip = pt.import_pylab
pt.import_pylab = lambda *a,**kw:None
self._save_cis = backend_inline.configure_inline_support
backend_inline.configure_inline_support = lambda *a, **kw: None
def teardown(self):
pt.activate_matplotlib = self._save_am
pt.import_pylab = self._save_ip
backend_inline.configure_inline_support = self._save_cis
import matplotlib
matplotlib.rcParams = self._saved_rcParams
matplotlib.rcParamsOrig = self._saved_rcParamsOrig
def test_qt(self):
s = self.Shell()
gui, backend = s.enable_matplotlib(None)
assert gui == "qt"
assert s.pylab_gui_select == "qt"
gui, backend = s.enable_matplotlib("inline")
assert gui == "inline"
assert s.pylab_gui_select == "qt"
gui, backend = s.enable_matplotlib("qt")
assert gui == "qt"
assert s.pylab_gui_select == "qt"
gui, backend = s.enable_matplotlib("inline")
assert gui == "inline"
assert s.pylab_gui_select == "qt"
gui, backend = s.enable_matplotlib()
assert gui == "qt"
assert s.pylab_gui_select == "qt"
def test_inline(self):
s = self.Shell()
gui, backend = s.enable_matplotlib("inline")
assert gui == "inline"
assert s.pylab_gui_select == None
gui, backend = s.enable_matplotlib("inline")
assert gui == "inline"
assert s.pylab_gui_select == None
gui, backend = s.enable_matplotlib("qt")
assert gui == "qt"
assert s.pylab_gui_select == "qt"
def test_inline_twice(self):
"Using '%matplotlib inline' twice should not reset formatters"
ip = self.Shell()
gui, backend = ip.enable_matplotlib("inline")
assert gui == "inline"
fmts = {'png'}
active_mimes = {_fmt_mime_map[fmt] for fmt in fmts}
pt.select_figure_formats(ip, fmts)
gui, backend = ip.enable_matplotlib("inline")
assert gui == "inline"
for mime, f in ip.display_formatter.formatters.items():
if mime in active_mimes:
assert Figure in f
else:
assert Figure not in f
def test_qt_gtk(self):
s = self.Shell()
gui, backend = s.enable_matplotlib("qt")
assert gui == "qt"
assert s.pylab_gui_select == "qt"
gui, backend = s.enable_matplotlib("gtk")
assert gui == "qt"
assert s.pylab_gui_select == "qt"
def test_no_gui_backends():
for k in ['agg', 'svg', 'pdf', 'ps']:
assert k not in pt.backend2gui
def test_figure_no_canvas():
fig = Figure()
fig.canvas = None
pt.print_figure(fig)