Best option for time series with Python matplotlib

There are 3 coding samples below which demo auto scaling for dates in Python’s MatPlotLib. Best one appears to be the last one.

Sourced links are listed as well

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#http://stackoverflow.com/questions/29461608/matplotlib-fixing-x-axis-scale-and-autoscale-y-axis

# import numpy as np
# import matplotlib.pyplot as plt
#
# x, y = np.arange(0,101,1) ,300 - 0.1*np.arange(0,101,1)
# mask = (x >= 50) & (x <= 100)
#
# fig, ax = plt.subplots()
# ax.scatter(x[mask], y[mask])
#
# plt.show()

#http://stackoverflow.com/questions/32972371/how-to-show-date-and-time-on-x-axis-in-matplotlib
# import matplotlib.pyplot as plt
# import pandas as pd
# import matplotlib.dates as mdates
#
# times = pd.date_range('2015-10-06', periods=500, freq='10min')
#
# fig, ax = plt.subplots(1)
# fig.autofmt_xdate()
# plt.plot(times, range(times.size))
#
# xfmt = mdates.DateFormatter('%d-%m-%y %H:%M')
# ax.xaxis.set_major_formatter(xfmt)
#
# plt.show()

#this one works best and easiest it seems
#http://blog.mafr.de/2012/03/11/time-series-data-with-matplotlib/
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.dates as mdates

days, impressions = np.loadtxt("page-impressions.csv", unpack=True,
        converters={ 0: mdates.strpdate2num('%Y-%m-%d')})

plt.plot_date(x=days, y=impressions, fmt="r-")
plt.title("Pageessions on example.com")
plt.ylabel("Page impressions")
plt.grid(True)
plt.show()