plot.py

from datetime import datetime
import matplotlib.pyplot as plt

fn = "Nivel_Cares_1.csv"

X, Y = [], []
with open(fn) as f:
    f.readline() # leer y descartar cabecero
    for line in f:
        y, x = line.strip().replace(",",".").split(";")
        x = datetime.strptime(x, "%Y-%m-%d %H:%M:%S.000")
        y = float(y)
        X.append(x)
        Y.append(y)

plt.figure(figsize=(16,9))
plt.plot(X, Y)
plt.savefig("plot.png")