[Python] Calculation of x-axis values in a bar plot

I use the following code to create a bar plot:

import matplotlib.pyplot as plt

products = ['mouse','keyboard','antivirus','scanner','pendrive','battery','mobile']
price = [500, 1200, 550, 4500, 3500, 1500, 2500]
plt.title('Scene-1')
q = plt.bar(products, price)

for b in q:
val = b.get_height()
plt.text(b.get_x() + b.get_width()/2, val, round(val, 2), ha= 'center', va= 'bottom')
print(b)
print('b.get_x()', '\n', b.get_x())

plt.show()


My question is: how are the x-values returned by b.get_x(), such as -0.4, 0.6, 1.6, 2.6, 3.6, 4.6, 5.6, calculated? And how do these values relate to the positions of the bars on the x-axis in the plot?

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