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You can get key by using dict.keys(), dict.values() and list.index() methods, see code samples below: names_dict = {'george':16,'amber':19} search_age = int(raw_input("Provide age")) key = names_dict.keys()[names_dict.values().index(search_age)]
Code sample
dictionary = {'george': 16, 'amber': 19}search_age = input("Provide age")for name, age in dictionary.items(): # for name, age in dictionary.iteritems(): (for Python 2.x)if age == search_age:print(name)May 4, 2023 · This code finds the key of a given value in a dictionary by using a list comprehension to iterate over the items in the dictionary and check if the value matches the given value. If a key is found, it is added to a list, and the first element of the list is printed as the key for the given value.
Get Keys. The keys() method will return a list of all the keys in the dictionary. Example. Get a list of the keys: x = thisdict.keys () Try it Yourself » The list of the keys is a view of the dictionary, meaning that any changes done to the dictionary will be reflected in the keys list. Example.
Jan 18, 2014 · In python, how can you retrieve a key from a dictionary? Asked 13 years, 6 months ago. Modified 10 years, 4 months ago. Viewed 2k times. 5. I have a hashable identifier for putting things in a dictionary: class identifier(): def __init__(self, d): self.my_dict = d. self.my_frozenset = frozenset(d.items()) def __getitem__(self, item):
- Instead of d[n1] = 'Node 1' use: d[n1] = ('Node 1', n1) Then you have access to n1 no matter how you found the value. I don't believe there is a...
- Have two dictionaries. - Whenever you add a key/value to the primary dictionary, also add them to the reverse dictionary, but with the key/value s...
- Here is a way to use a custom node object with NetworkX. If you store the object in the "node attribute" dictionary you can use it as a reverse dic...
- The thing is, there is no guaranty that the key is effectively a Node. What if you do d[my_id]=d[my_id] Everything would still work perfectly ex...
- using my_id to lookup 'Node 2' actually needs to lookup n2 as an intermediate step This is not true . A dictionary is a hashtable: it maps the has...
- Creating A Dictionary
- Using Dict.Items
- Using List Comprehension
- Get All Keys with A Specific Value
- Get Key of Value with A Specific Condition
- Additional Resources
First, you’ll create a dictionary that will be used to learn how to get keys by value. The sample dictionary contains five key-value pairs. And it has a value 4for two keys. Code To add keys after creating a dictionary, you can read How to Add Keys to Dictionary Output When you print the dictionary, you’ll see the below output.
This section teaches you how to get key by value in a dictionary using the dict.items()method. When you iterate through a dictionary using the dict.items() method, you’ll get both the key and valueof the current iteration. Check if the current iteration’s value equals the value you desire to get the keyof. 1. If it is equal, then you can use the ke...
List comprehension provides a simpler syntax to iterate over an iterableand create a new list based on the values in the iterable. 1. It provides you with a list of values that pass the specified condition. Here also, you need to use the dict.items()method to iterate over the dictionary and comprehend a new list based on a value. Use this method wh...
This section teaches you how to get all keys with a specific value in a python dictionary. 1. iterate over the dictionary using the dict.items()and list comprehension. 2. Check if the value is equal to the value you desire. 3. If yes, you’ll return the key to the list comprehension, creating a new list of keys. The resultant list will contain the k...
To get key of value with a specific condition. 1. Use the dict.items()to iterate over the dictionary 2. Check if the value passes the specific condition using the ifstatement. Code The code below demonstrates how to get the key of value with a specific condition using dict.items() and an ifstatement. Output
Jan 5, 2024 · There are various ways to access items in the Dictionary or call dictionary value, we are explaining some generally used and easy methods we use for accessing Items (key-value) in the dictionary: Using key() Method; Using values() Method; Using an operator; Using List Comprehension; Using dict.items() Using enumerate() Method; Using for loop ...
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Mar 11, 2024 · The first method to find a key from a value in a dictionary is by iterating over the dictionary’s key-value pairs using a for loop. If the current value matches the searched value, return the corresponding key.
