python AttributeError: 'tuple' object has no attribute 'show' using matplotlib

Question

Weird error maybe caused by matplotlib?

asd=bp.plot_measurements(ps[:, 0], ps[:, 1])
asd.show()

The error:

AttributeError: 'tuple' object has no attribute 'show'

and this is the definition:

def plot_measurements(xs, ys=None, color='k', lw=2,  label='Measurements', lines=False, **kwargs):
    """ Helper function to give a consistant way to display
    measurements in the book.
    """

    plt.autoscale(tight=True)
    if lines:
        if ys is not None:
            return plt.plot(xs, ys, color=color, lw=lw, ls='--', 
    label=label, **kwargs)
        else:
            return plt.plot(xs, color=color, lw=lw, ls='--', label=label, 
    **kwargs)
    else:
        if ys is not None:
            return plt.scatter(xs, ys, edgecolor=color, facecolor='none',
                        lw=2, label=label, **kwargs),
        else:
            return plt.scatter(range(len(xs)), xs, edgecolor=color, 
    facecolor='none', lw=2, label=label, **kwargs)

Any idea what could cause this?

It looks your bp.plot_measurements returns a tuple of objects. Why don't you call plt.show() instead? — taras
– taras, Commented Jun 24, 2017 at 9:30
@user128285 im using a kalman filter library that implements that definition. cant really change how it was implemented. only thing i can do is find a way to plot what it reutrns — Drak
– Drak, Commented Jun 24, 2017 at 10:30
@snakecharmerb if i remove the trailing commas i get this error AttributeError: 'PathCollection' object has no attribute 'show' — Drak
– Drak, Commented Jun 24, 2017 at 10:34

ImportanceOfBeingErnest · Accepted Answer · 2017-06-24 10:11:04Z

2

The function plot_measurements has several possible return types. It can be a tuple of lines (if lines == True) or a Collection or a tuple of Collections (if lines ==False).

In all of the three possible cases, the return type is an object which does not have a show() method.

Instead you probably want to call plt.show(), where plt is matplotlib.pyplot.

answered Jun 24, 2017 at 10:11

ImportanceOfBeingErnest

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1 Comment

Drak Over a year ago

thanks to your comment and @user128285 's comment, it worked.

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