One tick per hour matplotlib plot (using pandas)

per_hour_plot.py

import pandas as pd
import matplotlib.pylab as plt
import matplotlib.dates as mdates
hours = mdates.HourLocator(interval = 1)
h_d_fmt = mdates.DateFormatter('%d-%m %H:%M:%S')

DATA_PATH = "/path/to/your/data"
TMS_COL = "timestamp_column"
COL_TO_PLOT = "column_to_plot"

fig, ax = plt.subplots(1, 1)
df = pd.read_csv(DATA_PATH, parse_dates=[TMS_COL])
df.set_index(TMS_COL).plot(y=COL_TO_PLOT, ax=ax, x_compat=True)
ax.xaxis.set_major_locator(hours)
ax.xaxis.set_major_formatter(h_d_fmt)
fig.autofmt_xdate()
plt.show()