# Matplotlib.pyplot.axvspan() in Python

Matplotlib is a plotting library for creating static, animated, and interactive visualizations in Python.\ Pyplot is a Matplotlib module which provides a MATLAB-like interface. Matplotlib is designed to be as usable as MATLAB, with the ability to use Python and the advantage of being free and open-source.

## matplotlib.pyplot.axvspan()

This function sets the vertical rectangle across the axes of the plot

Syntax: matplotlib.pyplot.axvspan(xmin, xmax, ymin=0, ymax=1, **kwargs)

Parameters:
xmin :Number indicating the starting position of the vertical rectangle on X-axis
xmin :Number indicating the ending position of the vertical rectangle on X-axis
ymin :vertical rectangle starting position on y axis, it will take values between 0 and 1, 0 being bottom of the axis, 1 being top of the axis
ymax :vertical rectangle ending position on y axis, it will take values between 0 and 1, 0 being bottom of the axis, 1 being top of the axis
**kwargs :Other optional parameters to change the properties of the rectangle, like changing color etc.

Example #1:

 `# Importing matplotlib.pyplot as plt ` `import` `matplotlib.pyplot as plt ` ` `  `# Initializing x and y ` `x ``=``[``1``, ``15``, ``27``, ``48``, ``50``] ` `y ``=``[``1``, ``12``, ``22``, ``45``, ``67``] ` ` `  `# Plotting the graph ` `plt.plot(x, y) ` ` `  `# Drawing rectangle starting  ` `# x = 5 and extending till x = 20 ` `# With vertical span starting at  ` `# half the length of y-axis(ymin = 0.5) ` `# And extending till the top of  ` `# axis(ymax = 1) ` `plt.axvspan(``5``, ``20``, ymin ``=` `0.5``, ymax ``=` `1``) ` `plt.show() `

Output:

Example #2:

 `import` `matplotlib.pyplot as plt ` ` `  ` `  `x ``=``[``1``, ``15``, ``27``, ``48``, ``50``] ` `y ``=``[``1``, ``12``, ``22``, ``45``, ``67``] ` ` `  `plt.plot(x, y) ` ` `  `# Drawing rectangle starting  ` `# x = 5 and extending till x = 15 ` `# With vertical span starting at ` `# 25 % the length of y-axis ` `# And extending till the 80 % of ` `# axis And also we are setting  ` `# the color of rectangle to yellow  ` `# and its edge color to blue ` `plt.axvspan(``5``, ``15``, ymin ``=` `0.25``, ` `            ``ymax ``=` `0.80``, ec ``=``'blue'``,  ` `            ``color ``=``'yellow'``) ` ` `  `plt.show() `

Output :

Example #3:

 `import` `matplotlib.pyplot as plt ` ` `  ` `  `x ``=``[``1``, ``15``, ``27``, ``48``, ``50``] ` `y ``=``[``1``, ``12``, ``22``, ``45``, ``67``] ` ` `  `plt.plot(x, y) ` ` `  `# Setting alpha will make  ` `# the rectangle transparent ` `plt.axvspan(``10``, ``30``, ymin ``=` `0.15``,  ` `            ``ymax ``=` `0.70``, ec ``=``'blue'``, ` `            ``color ``=``'yellow'``, ` `            ``alpha ``=` `0.5``) ` ` `  `plt.show() `

Output :

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