python dictionary search by key code example

Example 1: how to get the key for a value in a dictionary in python

# function to return key for any value 
def get_key(val): 
    for key, value in my_dict.items(): 
         if val == value: 
             return key 
  
    return "key doesn't exist"
  
# Driver Code 
  
my_dict ={"java":100, "python":112, "c":11} 
  
print(get_key(100)) 
print(get_key(11))

Example 2: search in dict python

dictionary = { "key1" : 1, "name" : "Jordan", "age" : 21 }
for key in dictionary.keys():
    print("the key is {} and the value is {}".format(key, dictionary[key]))
    # or print("the key is",key,"and the value is",dictionary[key])
# OUTPOUT
# the key is key1 and the value is 1
# the key is name and the value is Jordan
# the key is age and the value is 21

Example 3: python check if key exists

d = {"apples": 1, "banannas": 4}
# Preferably use .keys() when searching for a key
if "apples" in d.keys():
  print(d["apples"])

Example 4: python how to check if a dictionary key exists

if word in data:
  return data[word]
else:
  return "The word doesn't exist. Please double check it."

Example 5: find a key in a dictionary python

# How to find a key / check if a key is in a dict

# Easiest way
fruits = {'apple': 2, 'pear': 5, 'strawberry': 3}

if 'apple' in fruits:
	print("Key found!")
else:
  	print("Key not found!")

Example 6: find key by value python

print(list(d.keys())[list(d.values()).index(990)])