This Matplotlib Line lesson is for a beginner. Read the short notes, run each example, then change one name or number and run it again.
A line style changes the stroke, not the data. Solid, dashed, and dotted are the usual choices.
Pick a style that still reads in black and white. Do not rely on colour alone.
Example 1: Start here
linestyle="--" is the dashed form of plt.plot.
x = [1, 2, 3] # a list; the values stay in this order
y = [2, 4, 6] # a list; the values stay in this order
print("dashed", list(zip(x, y))) # zip keeps each pair together
Example 2: List the points
Matplotlib Line draws points. Printing each pair lets you check the data before a chart library plots it.
points = [(1, 23), (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 = [23, 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 = [23, 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
linestyle="--" is the dashed form of plt.plot.
