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If the ASCII character 95 _ is used in as first character in a plot label, the label will not show up in the legend.
If only labels with _ in front are used, the following warning is given:
/opt/pkg/devel/python/3.4.3/lib/python3.4/site-packages/matplotlib-1.4.3-py3.4-linux-x86_64.egg/matplotlib/axes/_axes.py:475: UserWarning: No labelled objects found. Use label='...' kwarg on individual plots.
warnings.warn("No labelled objects found. "In order to test this bug, I tried a variety of matplotlib versions on Ubuntu and OS X.
- 0.99.1.1
- 1.1.0
- 1.3.1
- 1.4.3
All have the above behavior.
In order to reproduce the bug, I used the following minimal example:
import numpy as np
import matplotlib
import matplotlib.pyplot as plt
print(matplotlib.__version__)
x = np.linspace(-10, 10, 1024)
y = np.sin(x)
plt.plot(x,y, label="_abc")
plt.legend()
plt.show()Using r"_abc" instead does not solve the problem.
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