'Create multiple plots based on the entry of another column

I want to create a loop to plot the data in column "B" based on the value in column "A", so one plot for the "B" data in 2020 and a separate one for the data in 2021.

A	B
2020	10
2020	15
2021	18
2021	20
2021	15

What i tried so far, but didnt really work out, since plots are just empty:

for A, data in df.groupby('A'):
    plt.plot(df.query('A=="{A}"')['B'], label=A)
    plt.savefig('plot_{}.png'.format(A))
    plt.show()

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'Create multiple plots based on the entry of another column

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