This Matplotlib Subplot lesson is for a beginner. Read the short notes, run each example, then change one name or number and run it again.
A subplot is one chart inside a figure that holds several charts. Give each subplot its own title.
The example keeps two series apart instead of drawing them on one axis.
Example 1: Start here
plt.subplot(1, 2, 1) selects the first cell of a one-by-two figure.
morning = [70, 75, 80] # a list; the values stay in this order
afternoon = [82, 78, 90] # a list; the values stay in this order
print("morning", morning) # a comma prints each value, with a space between
print("afternoon", afternoon) # a comma prints each value, with a space between
Example 2: List the points
Matplotlib Subplot draws points. Printing each pair lets you check the data before a chart library plots it.
points = [(1, 9), (2, 12), (3, 18)] # a list; the values stay in this order
for x, y in points: # repeat the indented lines once per value
print(x, y) # a comma prints each value, with a space between
Example 3: Find the highest bar
The tallest bar is the largest number. max does that lookup.
heights = [9, 12, 18] # a list; the values stay in this order
print(max(heights)) # the largest value
Example 4: Label each point
A chart label belongs with its number. zip keeps each day next to its height.
labels = ["Mon", "Tue", "Wed"] # a list; the values stay in this order
heights = [9, 12, 18] # a list; the values stay in this order
for label, height in zip(labels, heights): # repeat the indented lines once per value
print(label, height) # a comma prints each value, with a space between
plt.subplot(1, 2, 1) selects the first cell of a one-by-two figure.
