Human: saving figure as pdf. Assistant: 
Here is a Python function for saving figures as pdf

import matplotlib.pyplot as plt

def save_figure():
    """
    Save the figure as a pdf
    """
    plt.savefig('test.pdf')

# Enter the data
x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
y = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

# Calling the function
print((save_figure()))

#Example Output
# None

#Remember to inspect code for bugs.