subplot2grid()

subplot2grid() is a function in the matplotlib library that is used to create a grid of subplots with a specified shape and location of each subplot. It is useful when you want to create subplots of different sizes and positions within a grid. It takes 3 arguments - the shape of the grid, the location of the subplot in the grid, and optionally the rowspan and colspan of the subplot.

Here is an example code that demonstrates the use of subplot2grid() to create a 2x2 grid of subplots, where the first subplot spans both columns:

import matplotlib.pyplot as plt

# create a 2x2 grid of subplots
fig = plt.figure()
ax1 = plt.subplot2grid((2,2), (0,0), rowspan=2)
ax2 = plt.subplot2grid((2,2), (0,1))
ax3 = plt.subplot2grid((2,2), (1,1))

# plot some data in each subplot
ax1.plot([1,2,3])
ax1.set_title('subplot 1')
ax2.plot([4,5,6])
ax2.set_title('subplot 2')
ax3.plot([7,8,9])
ax3.set_title('subplot 3')

plt.show()

This code will create a figure with a 2x2 grid of subplots, where the first subplot spans both columns and the other two subplots occupy one cell each. The resulting plot will display some sample data in each subplot, with a title for each subplot.