Closed
Description
I suggest to improve the error message when an argument of xticks is missing. This would considerably ease debugging.
from matplotlib import pyplot as plt
xs = [1, 2, 3]
ys = [50, 10, 20]
ticks = ['banana', 'apple', 'pear']
plt.bar(xs, ys)
plt.xticks(ticks)Here the problem is that I forgot the xs argument for plt.xticks:
plt.xticks(xs, ticks)The error message should state so, but here's what it currently prints:
AttributeError: 'NoneType' object has no attribute 'update'
And the traceback:
------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-80-3ea0d1225cd3> in <module>
11 plt.bar(xs-width/2, neg_ys, width=width)
12 plt.bar(xs+width/2, pos_ys, width=width)
---> 13 plt.xticks(ticks)
/usr/local/lib/python3.6/dist-packages/matplotlib/pyplot.py in xticks(ticks, labels, **kwargs)
1547 labels = ax.get_xticklabels()
1548 elif labels is None:
-> 1549 locs = ax.set_xticks(ticks)
1550 labels = ax.get_xticklabels()
1551 else:
/usr/local/lib/python3.6/dist-packages/matplotlib/axes/_base.py in set_xticks(self, ticks, minor)
3335 Default is ``False``.
3336 """
-> 3337 ret = self.xaxis.set_ticks(ticks, minor=minor)
3338 self.stale = True
3339 return ret
/usr/local/lib/python3.6/dist-packages/matplotlib/axis.py in set_ticks(self, ticks, minor)
1702 """
1703 # XXX if the user changes units, the information will be lost here
-> 1704 ticks = self.convert_units(ticks)
1705 if len(ticks) > 1:
1706 xleft, xright = self.get_view_interval()
/usr/local/lib/python3.6/dist-packages/matplotlib/axis.py in convert_units(self, x)
1528 return x
1529
-> 1530 ret = self.converter.convert(x, self.units, self)
1531 return ret
1532
/usr/local/lib/python3.6/dist-packages/matplotlib/category.py in convert(value, unit, axis)
51
52 # force an update so it also does type checking
---> 53 unit.update(values)
54
55 str2idx = np.vectorize(unit._mapping.__getitem__,
AttributeError: 'NoneType' object has no attribute 'update'
Metadata
Metadata
Assignees
Labels
No labels