[Matplotlib-users] How does the x coordinates work for plt.bar()?

[Sreyan Chakravarty]

I am unable to understand how the  plt.bar() function actually works.

Take the following code for example:

from collections import Countergrades = [83, 95, 91, 87, 70, 0, 85,
82, 100, 67, 73, 77, 0]
# Bucket grades by decile, but put 100 in with the 90shistogram =
Counter(min(grade // 10 * 10, 90) for grade in grades)
plt.bar([x + 5 for x in histogram.keys()],  # Shift bars right by 5
        histogram.values(),                 # Give each bar its correct height
        10,                                 # Give each bar a width of 10
        edgecolor=(0, 0, 0))                # Black edges for each bar


What does it mean by shift bars by 5 in the plt.bar() call? Does it mean by
5 pixels? 5%? 5% of what?

These measurements make no sense. Can someone explain to me how this works?
-- 
Regards,
Sreyan Chakravarty
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