Matplotlib.pyplot.waitforbuttonpress() in Python

Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. Pyplot is a state-based interface to a Matplotlib module which provides a MATLAB-like interface. There are various plots which can be used in Pyplot are Line Plot, Contour, Histogram, Scatter, 3D Plot, etc.

matplotlib.pyplot.waitforbuttonpress() method

The waitforbuttonpress() method in pyplot module of matplotlib library is used for blocking call to interact with the figure.

Syntax: matplotlib.pyplot.waitforbuttonpress(timeout=- 1)

Parameters: This method accept the following parameters that are discussed below:

• timeout: This parameter is the timeout value.

Returns: This method does not returns any value.

Below examples illustrate the matplotlib.pyplot.waitforbuttonpress() function in matplotlib.pyplot:

Example 1:

# Implementation of matplotlib function
import numpy as np
import matplotlib.pyplot as plt


for ite in range(2):
    x = np.linspace(-2, 6, 100)
    y = (ite + 1)*x

    fig = plt.figure()

    ax = fig.subplots()
    ax.plot(x, y, '-b')

    fig.suptitle("""matplotlib.pyplot.waitforbuttonpress()
function Example\n\n""", fontweight ="bold")

    w = plt.waitforbuttonpress()
    print("Result after", ite, "click", w)

    plt.show()

Output:

Example 2:

# Implementation of matplotlib function
import numpy as np
import matplotlib.cm as cm
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt


fig = plt.figure()
ax = fig.subplots()

def tellme(s):

    fig.suptitle(s, fontweight ="bold")
    fig.canvas.draw()
    renderer = fig.canvas.renderer
    fig.draw(renderer)

plt.clf()
ax.axis([-1., 1., -1., 1.])

plt.setp(plt.gca(), autoscale_on = False)

tellme("""matplotlib.pyplot.waitforbuttonpress()
function Example\n\n""")

w = plt.waitforbuttonpress()
print("Result after click :", w)

plt.show()

Output: