Human: Can you show me a Python code to calculate the angle between two points in 2d. Assistant: 
Here is a Python code to calculate the angle between two points in 2d

import math

def angle(p1, p2):
    """
    Calculate the angle between two points in 2D.
    """
    return math.atan2((p2[1] - p1[1]), (p2[0] - p1[0]))

# Enter the points
p1 = (1, 2)
p2 = (3, 4)

# Calling the function
print((angle(p1, p2)))

#Example Output
# 0.7853981633974483

#Remember to inspect code for bugs.