同一图中的多行曲线

"""
================================================================================
                     DRAW MULTIPLE LINES IN THE SAME PLOT
================================================================================
"""
import matplotlib.pyplot as plt

# The data
x =  [1, 2, 3, 4, 5]
y1 = [2,  15, 27, 35, 40]
y2 = [10, 40, 45, 47, 50]
y3 = [5,  25, 40, 45, 47]

# Initialise the figure and axes.
fig, ax = plt.subplots(1, figsize=(8, 6))

# Set the title for the figure
fig.suptitle('Multiple Lines in Same Plot', fontsize=15)

# Draw all the lines in the same plot, assigning a label for each one to be
# shown in the legend.
ax.plot(x, y1, color="red", label="My Line 1")
ax.plot(x, y2, color="green", label="My Line 2")
ax.plot(x, y3, color="blue", label="My Line 3")

# Add a legend, and position it on the lower right (with no box)
plt.legend(loc="lower right", title="Legend Title", frameon=False)

plt.show()