<human>:  function calculate hamming distance function.
<bot>: Here is a Python function to calculate the hamming distance

import datetime

def hamming_distance(x, y):
  """Calculate the hamming distance between two strings.

  :param str x:
  :param str y:
  :rtype: int
  :return:
  """
  return len(set(x).symmetric_difference(set(y)))

# Enter the string
x = "hello"
y = "world"

# Calling the function
print((hamming_distance(x, y)))

#Example Output
# 5

#Remember to inspect code for bugs.