fishnsotong

import numpy as np
import matplotlib.pyplot as plt

# importing data from csv file
xs, ys, zs = np.loadtxt("data.txt", unpack=True, delimiter=",", dtype=float)

# plotting
plt.plot(xs, ys, "b-", label="line one") # blue line, label displayed in legend
plt.plot(xs, zs, "r-", label="line two") # red line, for scatter plot replace with "ro"