error when passing string marker argument to plot

[CarloLucibello]

this is what I get

julia> plt.plot(rand(10), marker='o')
PyError ($(Expr(:escape, :(ccall(#= /home/carlo/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:43 =# @pysym(:PyObject_Call), PyPtr, (PyPtr, PyPtr, PyPtr), o, pyargsptr, kw))))) <class 'TypeError'>
TypeError("float() argument must be a string or a number, not 'PyCall.jlwrap'")
  File "/usr/lib/python3.8/site-packages/matplotlib/pyplot.py", line 2794, in plot
    return gca().plot(
  File "/usr/lib/python3.8/site-packages/matplotlib/axes/_axes.py", line 1665, in plot
    lines = [*self._get_lines(*args, data=data, **kwargs)]
  File "/usr/lib/python3.8/site-packages/matplotlib/axes/_base.py", line 225, in __call__
    yield from self._plot_args(this, kwargs)
  File "/usr/lib/python3.8/site-packages/matplotlib/axes/_base.py", line 405, in _plot_args
    seg = func(x[:, j % ncx], y[:, j % ncy], kw, kwargs)
  File "/usr/lib/python3.8/site-packages/matplotlib/axes/_base.py", line 312, in _makeline
    seg = mlines.Line2D(x, y, **kw)
  File "/usr/lib/python3.8/site-packages/matplotlib/lines.py", line 382, in __init__
    self._marker = MarkerStyle(marker, fillstyle)
  File "/usr/lib/python3.8/site-packages/matplotlib/markers.py", line 243, in __init__
    self.set_marker(marker)
  File "/usr/lib/python3.8/site-packages/matplotlib/markers.py", line 309, in set_marker
    Path(marker)
  File "/usr/lib/python3.8/site-packages/matplotlib/path.py", line 127, in __init__
    vertices = _to_unmasked_float_array(vertices)
  File "/usr/lib/python3.8/site-packages/matplotlib/cbook/__init__.py", line 1390, in _to_unmasked_float_array
    return np.asarray(x, float)
  File "/usr/lib/python3.8/site-packages/numpy/core/_asarray.py", line 85, in asarray
    return array(a, dtype, copy=False, order=order)


Stacktrace:
 [1] pyerr_check at /home/carlo/.julia/packages/PyCall/zqDXB/src/exception.jl:60 [inlined]
 [2] pyerr_check at /home/carlo/.julia/packages/PyCall/zqDXB/src/exception.jl:64 [inlined]
 [3] _handle_error(::String) at /home/carlo/.julia/packages/PyCall/zqDXB/src/exception.jl:81
 [4] macro expansion at /home/carlo/.julia/packages/PyCall/zqDXB/src/exception.jl:95 [inlined]
 [5] #110 at /home/carlo/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:43 [inlined]
 [6] disable_sigint at ./c.jl:446 [inlined]
 [7] __pycall! at /home/carlo/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:42 [inlined]
 [8] _pycall!(::PyCall.PyObject, ::PyCall.PyObject, ::Tuple{Array{Int64,1}}, ::Int64, ::PyCall.PyObject) at /home/carlo/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:29
 [9] _pycall!(::PyCall.PyObject, ::PyCall.PyObject, ::Tuple{Array{Int64,1}}, ::Base.Iterators.Pairs{Symbol,Char,Tuple{Symbol},NamedTuple{(:marker,),Tuple{Char}}}) at /home/carlo/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:11
 [10] #pycall#116 at /home/carlo/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:83 [inlined]
 [11] #pycall at ./none:0 [inlined]
 [12] #plot#85(::Base.Iterators.Pairs{Symbol,Char,Tuple{Symbol},NamedTuple{(:marker,),Tuple{Char}}}, ::typeof(plot), ::Array{Int64,1}) at /home/carlo/.julia/packages/PyPlot/4wzW1/src/PyPlot.jl:177
 [13] (::PyPlot.var"#kw##plot")(::NamedTuple{(:marker,),Tuple{Char}}, ::typeof(plot), ::Array{Int64,1}) at ./none:0
 [14] top-level scope at In[28]:1

[CarloLucibello]

ops, I was actually passing a Char instead of a String, plt.plot(rand(10), marker="o") works fine