fix: Partially revert 5e9cc0c, which globally reconfigured Python war…

…nings, closes #87

leather/chart.py

@@ -1,4 +1,5 @@
 import os
+import warnings
 import xml.etree.ElementTree as ET
 
 import leather.svg as svg
@@ -8,7 +9,7 @@
 from leather.scales import Linear, Scale, Temporal
 from leather.series import CategorySeries, Series
 from leather.shapes import Bars, Columns, Dots, Line
-from leather.utils import DIMENSION_NAMES, Box, IPythonSVG, X, Y, warn
+from leather.utils import DIMENSION_NAMES, Box, IPythonSVG, X, Y
 
 
 class Chart:
@@ -185,7 +186,7 @@ def _validate_dimension(self, dimension):
             for series, shape in self._layers:
                 if not scale.contains(series.min(dimension)) or not scale.contains(series.max(dimension)):
                     d = DIMENSION_NAMES[dimension]
-                    warn(
+                    warnings.warn(
                         'Data contains values outside %s scale domain. '
                         'All data points may not be visible on the chart.' % d
                     )

leather/utils.py

@@ -1,4 +1,3 @@
-import warnings
 from collections import namedtuple
 from datetime import date, datetime, timedelta
 from decimal import Decimal
@@ -37,15 +36,6 @@ def IPythonSVG(x):
 DummySeries = namedtuple('DummySeries', ['name'])
 
 
-formatwarning_orig = warnings.formatwarning
-warnings.formatwarning = lambda message, category, filename, lineno, line=None: \
-    formatwarning_orig(message, category, filename, lineno, line='')
-
-warn = warnings.warn
-warnings.resetwarnings()
-warnings.simplefilter('always')
-
-
 def to_year_count(d):
     """
     date > n years