Merge pull request matplotlib#23332 from anntzer/ls

Validate Text linespacing on input.

Author: tacaswell

lib/matplotlib/tests/test_text.py

@@ -519,8 +519,8 @@ def test_two_2line_texts(spacing1, spacing2):
     fig = plt.figure()
     renderer = fig.canvas.get_renderer()
 
-    text1 = plt.text(0.25, 0.5, text_string, linespacing=spacing1)
-    text2 = plt.text(0.25, 0.5, text_string, linespacing=spacing2)
+    text1 = fig.text(0.25, 0.5, text_string, linespacing=spacing1)
+    text2 = fig.text(0.25, 0.5, text_string, linespacing=spacing2)
     fig.canvas.draw()
 
     box1 = text1.get_window_extent(renderer=renderer)
@@ -534,6 +534,11 @@ def test_two_2line_texts(spacing1, spacing2):
         assert box1.height != box2.height
 
 
+def test_validate_linespacing():
+    with pytest.raises(TypeError):
+        plt.text(.25, .5, "foo", linespacing="abc")
+
+
 def test_nonfinite_pos():
     fig, ax = plt.subplots()
     ax.text(0, np.nan, 'nan')

lib/matplotlib/text.py

@@ -5,7 +5,7 @@
 import functools
 import logging
 import math
-import numbers
+from numbers import Real
 import weakref
 
 import numpy as np
@@ -181,7 +181,7 @@ def __init__(self,
         self._renderer = None
         if linespacing is None:
             linespacing = 1.2  # Maybe use rcParam later.
-        self._linespacing = linespacing
+        self.set_linespacing(linespacing)
         self.set_rotation_mode(rotation_mode)
         self.update(kwargs)
 
@@ -1000,6 +1000,7 @@ def set_linespacing(self, spacing):
         ----------
         spacing : float (multiple of font size)
         """
+        _api.check_isinstance(Real, spacing=spacing)
         self._linespacing = spacing
         self.stale = True
 
@@ -1186,7 +1187,7 @@ def set_rotation(self, s):
             The rotation angle in degrees in mathematically positive direction
             (counterclockwise). 'horizontal' equals 0, 'vertical' equals 90.
         """
-        if isinstance(s, numbers.Real):
+        if isinstance(s, Real):
             self._rotation = float(s) % 360
         elif cbook._str_equal(s, 'horizontal') or s is None:
             self._rotation = 0.