Running IJulia on Conda. Trying to plot Quandl data - matplotlib

Question

Simple example of using Google prices in DataFrame format. Gadfly plot gives the following error: TypeError(u'There is no Line2D property "y"',). Also references matplotlib for some reason.
Here's code:
using Quandl
using DataFrames
google = quandl("GOOG/NASDAQ_QQQ", format = "DataFrame")
date = google[1]
dt_str = Array(Any,length(date))
for i=1:length(date)
dt_str[i] = string(date[i]);
end
price = google[5]
using Gadfly
set_default_plot_size(20cm, 10cm)
p1 = plot(x=dt_str, y=price,
Geom.point,
Geom.smooth(method=:lm),
Guide.xticks(ticks=[1:25]),
Guide.yticks(ticks=[1:25]),
Guide.xlabel("Date"),
Guide.ylabel("Price"),
Guide.title("Google: Close Price"))
LoadError: PyError (:PyObject_Call)
TypeError(u'There is no Line2D property "y"',)
File "C:\Anaconda2\lib\site-packages\matplotlib\pyplot.py", line 3154, in plot
ret = ax.plot(*args, **kwargs)
File "C:\Anaconda2\lib\site-packages\matplotlib\__init__.py", line 1811, in inner
return func(ax, *args, **kwargs)
File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_axes.py", line 1424, in plot
for line in self._get_lines(*args, **kwargs):
File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_base.py", line 395, in _grab_next_args
for seg in self._plot_args(remaining[:isplit], kwargs):
File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_base.py", line 374, in _plot_args
seg = func(x[:, j % ncx], y[:, j % ncy], kw, kwargs)
File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_base.py", line 281, in _makeline
self.set_lineprops(seg, **kwargs)
File "C:\Anaconda2\lib\site-packages\matplotlib\axes\_base.py", line 189, in set_lineprops
line.set(**kwargs)
File "C:\Anaconda2\lib\site-packages\matplotlib\artist.py", line 936, in set
(self.__class__.__name__, k))
while loading In[64], in expression starting on line 1
in getindex at C:\Users\yburkitbayev\.julia\v0.4\PyCall\src\PyCall.jl:239

Answer 1

The presence of the PyError would imply to me that the session in which this example was executed has loaded PyPlot prior to loading Gadfly. Both PyPlot and Gadfly export the plot function, so uses of plot in a session where both PyPlot and Gadfly have been loaded require the qualification of the function name with the package name (e.g. PyPlot.plot or Gadfly.plot).
Executing your example in a session where PyPlot has not been loaded, but Gadfly is loaded, produces a Gadfly plot without displaying the error message provided in your post.