Cursor and event handling in Matplotlib - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the module needed for plotting.

Matplotlib

import [1] as plt

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Amatplotlib.pyplot

Bnumpy

Cseaborn

Dpandas

Attempts:

3 left

💡 Hint

Common Mistakes

Importing numpy or pandas instead of matplotlib.pyplot.

Using seaborn which is a different plotting library.

We use matplotlib.pyplot for plotting graphs and handling cursor events.

2fill in blank

medium

Complete the code to create a figure and axis for plotting.

Matplotlib

fig, ax = plt.[1]()

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Aplot

Bsubplots

Cfigure

Dshow

Attempts:

3 left

💡 Hint

Common Mistakes

Using plt.figure() which returns only the figure.

Using plt.plot() which creates a plot but not figure and axes separately.

The subplots() function creates a figure and axes for plotting.

3fill in blank

hard

Fix the error in the event connection code to correctly connect the cursor move event.

Matplotlib

cid = fig.canvas.[1]('motion_notify_event', on_move)

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Aadd_event

Bconnect_event

Cconnect

Dbind

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names like connect_event or add_event.

Trying to use bind which is not a matplotlib method.

The correct method to connect events in matplotlib is connect.

4fill in blank

hard

Fill both blanks to create a cursor object and enable it on the axis.

Matplotlib

cursor = Cursor([1], useblit=True, color='red', linewidth=1)
cursor.[2]()

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Aax

Bfig

Cdraw

Denable

Attempts:

3 left

💡 Hint

Common Mistakes

Passing figure instead of axis to Cursor.

Using a non-existent method like enable() instead of draw().

The cursor is created on the axis ax and draw() is called to enable it.

5fill in blank

hard

Fill all three blanks to create a function that prints cursor coordinates on mouse move.

Matplotlib

def on_move(event):
    if event.inaxes == [1]:
        x, y = event.[2], event.[3]
        print(f"Cursor at: ({x:.2f}, {y:.2f})")

Drag options to blanks, or click blank then click option'

Aax

Bxdata

Cydata

Dfig

Attempts:

3 left

💡 Hint

Common Mistakes

Checking event.inaxes against figure instead of axis.

Using event.x and event.y which are pixel positions, not data coordinates.

The event's inaxes is compared to ax. Coordinates are accessed via xdata and ydata.