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Code Snippet

#create a dictionary to store teacher's details
d={"Name": "Mr Moose","Subject": "Philosophy","Hobby":"Chess","School House":"Red House"}

def main():
    key=input("Enter key you are looking for:")
    if check_for_key(key)==True: #if the function check_for_key returns True (You can also omit the 'True' check as it will do this by default
        print("The dictionary has that key")
        print("Sorry, that key does not exist in the dictionary")

def check_for_key(key):
    if key in d: #if the user required key IS in the dictionary, then this function will return True
        return True

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