# You can use ‘in’ on a dictionary to check if a key exists<br /> d = {“key1”: 10, “key2”: 23}<br /> “key1” in d<br /> # Output:<br /> # True

d = {“key1”: 10, “key2”: 23}</p> <p>if “key1” in d:<br /> print(“this will execute”)</p> <p>if “nonexistent key” in d:<br /> print(“this will not”)

d = {“apples”: 1, “banannas”: 4}<br /> # Preferably use .keys() when searching for a key<br /> if “apples” in d.keys():<br /> print(d[“apples”])<br />

dict = {“key1”: 1, “key2”: 2}</p> <p>if “key1” in dict:

val = dict.get(key , defVal) # defVal is a default value if key does not exist

dict = {“key1”: 1, “key2”: 2}<br /> if “key1” in dict:<br /> print dict[“key1]<br /> >> 1

if word in data:<br /> return data[word]<br /> else:<br /> return “The word doesn’t exist. Please double check it.”

dict = { “How”:1,”you”:2,”like”:3,”this”:4}<br /> key = “this”<br /> if key in dict.keys():<br /> print(“present”)<br /> print(“value =”,dict[key])<br /> else:<br /> print(“Not present”)

d = {}<br /> r = d.get(‘missing_key’, None)<br />

# define a dictionary<br /> my_dict = {‘a’: 1, ‘b’: 2, ‘c’: 3}</p> <p># check if a key exists in the dictionary using the `in` operator<br /> if ‘a’ in my_dict:<br /> print(‘Key exists’) #print Key exists<br /> else:<br /> print(‘Key does not exist’)</p> <p># check if a key does not exist in the dictionary using the `in` operator<br /> if ‘d’ not in my_dict:<br /> print(‘Key does not exist’) #print Key does not exist<br /> else:<br /> print(‘Key exists’)</p> <p># check if a key exists in the dictionary using the `get()` method<br /> value = my_dict.get(‘a’)<br /> if value is not None:<br /> print(‘Key exists’) #print Key exists<br /> else:<br /> print(‘Key does not exist’)</p> <p># check if a key does not exist in the dictionary using the `get()` method<br /> value = my_dict.get(‘d’)<br /> if value is None:<br /> print(‘Key does not exist’) #print Key does not exist<br /> else:<br /> print(‘Key exists’)<br />