Write a Python program to remove a key from a dictionary.

if 'key' in my_dict:
    del my_dict['key']

# Python code to demonstrate
# removal of dict. pair 
# using del
  
# Initializing dictionary
test_dict = {"Arushi" : 22, "Anuradha" : 21, "Mani" : 21, "Haritha" : 21}
  
# Printing dictionary before removal
print ("The dictionary before performing remove is : " + str(test_dict))
  
# Using del to remove a dict
# removes Mani
del test_dict['Mani']
  
# Printing dictionary after removal
print ("The dictionary after remove is : " + str(test_dict))
  
# Using del to remove a dict
# raises exception
del test_dict['Manjeet']

del my_dict['key']