<human>:  dictionary get case insensistive key.
<bot>: Here is a Python program to create a dictionary with a case-insensistive key

import numpy as np

def get_case_insensitive_key(dictionary, key):
  """get_case_insensitive_key"""
  return dictionary.get(key.lower())

# Enter the dictionary
d = {'a': 1, 'b': 2, 'c': 3}

# Calling the function
print((get_case_insensitive_key(d, 'a')))

#Example Output
# 1

#Remember to inspect code for bugs.