example plot program for python

[martin3000]

#!/usr/bin/env python3
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.dates as dates
from matplotlib.dates import DayLocator
from decimal import Decimal

import elitech
import datetime
from datetime import datetime
import sys
import serial
import csv

if len(sys.argv)>1: #we have command line arguments
with open(sys.argv[1], mode='r', encoding="UTF-8", newline='') as f:
reader = csv.reader(f, delimiter='\t')
data = [row for row in reader]
date = [datetime.strptime(l[1], '%Y-%m-%d %H:%M:%S') for l in data]
vals = [float(l[2]) for l in data]
else:
port = "/dev/ttyUSB0"
try:
device = elitech.Device(port)
except serial.serialutil.SerialException:
print("Device not found")
exit(8)
device.init()

get data

data = device.get_data() #get a list of tuples with number,date and temp
date=[l[1] for l in data]
vals=[l[2] for l in data]

ax=plt.axes()
ax.xaxis.set_major_formatter(dates.DateFormatter('%H:%M %d.%m.%Y'))
ax.xaxis.set_minor_locator(DayLocator())
p1 = plt.plot_date(date,vals,linestyle='solid',fmt='o')

plt.ylabel('Temp')
plt.title('Temperature')
plt.xticks(rotation=45,ha='right')
plt.grid(axis='x',which='minor')
plt.show()