diff --git a/lib/matplotlib/quiver.py b/lib/matplotlib/quiver.py
index 283196200120..b11e9d5fa114 100644
--- a/lib/matplotlib/quiver.py
+++ b/lib/matplotlib/quiver.py
@@ -87,7 +87,7 @@
'dots' or 'inches': pixels or inches, based on the figure dpi
- 'x', 'y', or 'xy': respectively *X*, *Y*, or :math:`\sqrt{X^2 + Y^2}`
+ 'x', 'y', or 'xy': respectively *X*, *Y*, or :math:`\\sqrt{X^2 + Y^2}`
in data units
The arrows scale differently depending on the units. For
diff --git a/lib/matplotlib/style/core.py b/lib/matplotlib/style/core.py
index ef0d73b7bbf3..6d8b95cdc31a 100644
--- a/lib/matplotlib/style/core.py
+++ b/lib/matplotlib/style/core.py
@@ -32,7 +32,7 @@
# Users may want multiple library paths, so store a list of paths.
USER_LIBRARY_PATHS = [os.path.join(mpl._get_configdir(), 'stylelib')]
STYLE_EXTENSION = 'mplstyle'
-STYLE_FILE_PATTERN = re.compile('([\S]+).%s$' % STYLE_EXTENSION)
+STYLE_FILE_PATTERN = re.compile(r'([\S]+).%s$' % STYLE_EXTENSION)
# A list of rcParams that should not be applied from styles
diff --git a/lib/matplotlib/tests/test_dates.py b/lib/matplotlib/tests/test_dates.py
index 0e68b4ea8190..64447e566232 100644
--- a/lib/matplotlib/tests/test_dates.py
+++ b/lib/matplotlib/tests/test_dates.py
@@ -94,12 +94,6 @@ def test_too_many_date_ticks():
# setting equal datetimes triggers and expander call in
# transforms.nonsingular which results in too many ticks in the
# DayLocator. This should trigger a Locator.MAXTICKS RuntimeError
- warnings.filterwarnings(
- 'ignore',
- 'Attempting to set identical left==right results\\nin singular '
- 'transformations; automatically expanding.\\nleft=\d*\.\d*, '
- 'right=\d*\.\d*',
- UserWarning, module='matplotlib.axes')
t0 = datetime.datetime(2000, 1, 20)
tf = datetime.datetime(2000, 1, 20)
fig = plt.figure()
diff --git a/lib/matplotlib/tests/test_text.py b/lib/matplotlib/tests/test_text.py
index b2d906199a3f..ada43bfd7b60 100644
--- a/lib/matplotlib/tests/test_text.py
+++ b/lib/matplotlib/tests/test_text.py
@@ -30,7 +30,7 @@ def find_matplotlib_font(**kw):
from matplotlib.font_manager import FontProperties, findfont
warnings.filterwarnings(
'ignore',
- "findfont: Font family \[u?'Foo'\] not found. Falling back to .",
+ r"findfont: Font family \[u?'Foo'\] not found. Falling back to .",
UserWarning,
module='matplotlib.font_manager')
diff --git a/tests.py b/tests.py
index 6a86ae84d4fd..88d3e2195343 100755
--- a/tests.py
+++ b/tests.py
@@ -14,15 +14,16 @@
if __name__ == '__main__':
+ import dateutil.parser
try:
import setuptools
except ImportError:
pass
# The warnings need to be before any of matplotlib imports, but after
- # setuptools (if present) which has syntax error with the warnings enabled.
- # Filtering by module does not work as this will be raised by Python itself
- # so `module=matplotlib.*` is out of questions.
+ # dateutil.parser and setuptools (if present) which has syntax error with
+ # the warnings enabled. Filtering by module does not work as this will be
+ # raised by Python itself so `module=matplotlib.*` is out of question.
import warnings
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