Matplotlib major locators for bar plot

Question

Say I plot a bar plot:

from matplotlib.ticker  import IndexLocator
f , ax = plt.subplots(figsize=(10,5))
ax.bar(x, y, alpha=0.7, align='center')

How can I adjust the location of the major locators so that I have one per bar ?

I tried with:

ax.xaxis.set_major_locator(IndexLocator(x))

but I get:

TypeError: __init__() missing 1 required positional argument: 'offset'

Not sure if that is the right way to do it.

Also, why is the spacing between my bar plots off?

Answer 1

最简单的答案：

plt.xticks( x )