matplotlib example plotdatetimes (snippet)

Python matplotlib example 'plotdatetimes'

Functions in program:

def plotDateTime(dtLists, labels, title):
def getRandDate(i):

Modules used in program:

import matplotlib.ticker as mticker
import random
import datetime
import matplotlib.dates as mdates
import matplotlib.pyplot as plt
import pandas as pd

python plotdatetimes

Python matplotlib example: plotdatetimes

import pandas as pd
import matplotlib.pyplot as plt
import matplotlib.dates as mdates
import datetime
import random

import matplotlib.ticker as mticker

from pandas.plotting import register_matplotlib_converters
register_matplotlib_converters()


# Generate random datetime's
def getRandDate(i):
    randDate = '{}-{}-{}'.format(2019, random.randint(1, 12), i) #random.randint(1,28))
    randTime = '{}:{}:{}'.format(random.randint(1,23), random.randint(1,59), random.randint(1,59))
    timeStrng = randDate + ' ' + randTime
    return datetime.datetime.strptime(timeStrng, '%Y-%m-%d %H:%M:%S')


def plotDateTime(dtLists, labels, title): 
    # Plotting
    fig, ax = plt.subplots()

    # Iterate over lists of datetimes and plot them. 
    count = 0 
    colors = ['ro', 'go', 'bo', 'yo']
    for dtms in dtLists:
        x_axis, y_axis = zip(*[(item.date(),item.time()) for item in dtms])
        ax.plot(x_axis, y_axis, colors[count], markersize=1, label=labels[count])
        count += 1

    # Format the axis
    ax.set_ylim(["00:00:00", "23:59:59"])
    ax.xaxis.set_major_locator(mdates.MonthLocator())
    ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d')) 
    ax.xaxis.set_minor_locator(mdates.DayLocator())
    ax.tick_params(axis='both', which='major', labelsize=4)
    #ax.yaxis.set_major_locator(mdates.HourLocator()) 
    #ax.yaxis.set_major_formatter(mdates.DateFormatter('%H:%M'))

    # Plot everything dammit
    mticker.Locator.MAXTICKS = 2000

    # Put a legend to the right of the current axis
    fig.legend(loc=4, frameon=True, framealpha=0.1, fontsize='xx-small', bbox_to_anchor=(1, 0.5)) # loc=0

    fig.autofmt_xdate()
    plt.title(title)
    plt.ylabel('Time', fontsize=10)
    plt.xlabel('Date', fontsize=10)
    plt.show()

if __name__ == '__main__':
    dteTms1 = [getRandDate(i) for i in range(1,28)]
    dteTms2 = [getRandDate(i) for i in range(1,28)]

    dtLists = [dteTms1, dteTms2]
    labels = ['red', 'green']

Python links

Learn Python: https://pythonbasics.org/
Python Tutorial: https://pythonprogramminglanguage.com