I have a function who plot a line, something like that:
def tmp_plot(*args, **kwargs):
plt.plot([1,2,3,4,5],[1,2,3,4,5], *args, **kwargs)
and when I'm calling it with by passing line as a keyword argument like that:
tmp_plot(line = '-')
I get this error:
TypeError: set_lineprops() got multiple values for keyword argument 'line'
but it work fine with color argument.
I'm using matplotlib 1.4.3 and python 2.7.7
Any clues?
You can see where Matplotlib adds its own line argument in the Traceback below. This means your own keyword argument is a duplicate of Matplotlib's own one in the set_lineprops call:
In [1]: import matplotlib.pyplot as plt
In [2]: plt.plot([1,2,3], [1,4,9], line='-')
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-82-f298702afcfe> in <module>()
----> 1 plt.plot([1,2,3], [1,4,9], line='-')
/Users/xnx/anaconda/envs/py33/lib/python3.3/site-packages/matplotlib/pyplot.py in plot(*args, **kwargs)
2985 ax.hold(hold)
2986 try:
-> 2987 ret = ax.plot(*args, **kwargs)
2988 draw_if_interactive()
2989 finally:
/Users/xnx/anaconda/envs/py33/lib/python3.3/site-packages/matplotlib/axes.py in plot(self, *args, **kwargs)
4137 lines = []
4138
-> 4139 for line in self._get_lines(*args, **kwargs):
4140 self.add_line(line)
4141 lines.append(line)
/Users/xnx/anaconda/envs/py33/lib/python3.3/site-packages/matplotlib/axes.py in _grab_next_args(self, *args, **kwargs)
317 return
318 if len(remaining) <= 3:
--> 319 for seg in self._plot_args(remaining, kwargs):
320 yield seg
321 return
/Users/xnx/anaconda/envs/py33/lib/python3.3/site-packages/matplotlib/axes.py in _plot_args(self, tup, kwargs)
305 ncx, ncy = x.shape[1], y.shape[1]
306 for j in range(max(ncx, ncy)):
--> 307 seg = func(x[:, j % ncx], y[:, j % ncy], kw, kwargs)
308 ret.append(seg)
309 return ret
/Users/xnx/anaconda/envs/py33/lib/python3.3/site-packages/matplotlib/axes.py in _makeline(self, x, y, kw, kwargs)
257 **kw
258 )
--> 259 self.set_lineprops(seg, **kwargs)
260 return seg
261
TypeError: set_lineprops() got multiple values for argument 'line'
Perhaps you mean ls or linestyle instead of line in any case?
In [83]: plt.plot([1,2,3], [1,4,9], ls='-')
Out[83]: [<matplotlib.lines.Line2D at 0x10ed65610>]
I would guess the internals of matplotlib are unpacking an internal dictionary of parameters in addition to the caller provided ones, without stripping out duplicates so both you and matplot lib internals are providing separate keyword parameters of the same name via two parallel routes.
