If you want to find the key by the value, you can use a dictionary comprehension to create a lookup dictionary and then use that to find the key from the value. lookup = {value: key for key, value in self.data} lookup[value]

Jan 7, 2025 · The goal is to find the keys that correspond to a particular value. Since dictionaries quickly retrieve values based on keys, there isn’t a direct way to look up a key from a value. Using next() with a Generator Expression. This is the most …

Apr 9, 2024 · This Python tutorial explains how Python dictionary find key by value happens using for loop with item(), dictionary comprehension, with illustrative examples.

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.

May 28, 2024 · In this Python tutorial, I have explained how to do that using the different methods available in Python. The for loop allows you to access the dictionary’s key-value pair, where you can search by value. For example, look at the code below. "James": "HR", "Philp": "Engineering", "Vincent": "Marketing", "Adam": "Engineering", "Jhon": "HR"

May 15, 2023 · Use a for loop to iterate through the key-value pairs in the test_dict dictionary using the items() method. Check if the value of the current key-value pair is equal to the value of val. If the value of the current key-value pair matches val, append the key to the res list using the append() method.

Mar 11, 2025 · One of the most straightforward ways to find a key by its value in a Python dictionary is to use a simple loop. This method involves iterating through the dictionary items, checking each value against the target value, and returning the corresponding key when a …

Feb 18, 2025 · When we want to find a key from a value, we need to iterate through the dictionary's key-value pairs to check which key is associated with the target value. The most basic way to find a key from a value is by using a loop. Here's an example: if …

Aug 11, 2017 · keys = [] for key, value in a.iteritems(): if value == 10: print key keys.append(key) You can also do that in a list comprehension as pointed out in an other answer. b = 10 keys = [key for key, value in a.iteritems() if value == b]

Jul 15, 2014 · def key_with_value(self, value, default=None): for k, v in self.iteritems(): if v == value: return v. return default. def keys_with_value(self, value, default=None): return [v for k, v in self.iteritems() if v == value] Then d.key_with_value would behave rather like d.get, except the other way round.