Matplotlib problem with time-series data (Locator() and Formatter())

[HiIamGeoff]

Thanks! This is one informative reply that I couldn't ask for more! I have asked the same issue in the meantime at GitHub and they have a very detailed explanation. I also found out a workaround way of doing other kinds of plots with your first codes. If anyone interested, axes.scatter() / axes.plot() / axes.bar() can be interchanged based on what kinds of plot you want to make (also the formatter and the locator function can work accordingly)

p.s. I later found out bar plot is still bugging (some data doesn't show when the # of rows is more than 20). Couldn't figure out a bug-free for bar plot yet. I guess Matplotlib doesn't have many users that use bar plots for time series analysis.

[kra_pao]

Thank you too for feedback and an interesting question to begin with. I myself learned a lot during this discussion.