Passing numpy array to function giving type error

Question

Not sure why I keep getting an error when I try to plot a bar chart.

 def plotBar(x,y):
    plt.bar(x, y, width=1, align='center', color='plum', edgecolor='firebrick',linewidth=1)
    plt.show()

In main I am calling the function like this:

x1=np.arange(1,101)
y1=np.arange(50,151)

classname.plotBar(x1,y1)

However, I keep getting this error:

TypeError: plotBar() takes 2 positional arguments but 3 were given

You need to declare plotBar as: def plotBar(self,x,y): since it seems to be a class method of classname — Jean-Marc Volle
– Jean-Marc Volle, Commented May 25, 2020 at 13:13
classname.plotBar(x1,y1) It seems like you've tried to create a class that has a method called plotBar. When creating a method, the first variable (often called self) is the class instance. You can try to change plotBar(x,y) into plotBar(self,x,y). — Hampus Larsson
– Hampus Larsson, Commented May 25, 2020 at 13:13

Valdi_Bo · Accepted Answer · 2020-05-25 13:37:04Z

1

I declared your function as a static method in a class:

class Xxx:
    @staticmethod
    def plotBar(x,y):
        plt.bar(x, y, width=1, align='center', color='plum',
            edgecolor='firebrick', linewidth=1)
        plt.show()

The next correction is that both arrays have to be of equal length, so I changed definition of y, so that it also has 100 elements:

x1 = np.arange(1,101)
y1 = np.arange(51,151)

(previously it had 101 elements).

Then I called it:

Xxx.plotBar(x1,y1)

and got a picture.

answered May 25, 2020 at 13:37

Valdi_Bo

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