Python | Dictionary has_key()
Dictionary in Python is an unordered collection of data values, used to store data values like a map, which unlike other Data Types that hold only a single value as an element, Dictionary holds key : value pair.
In Python Dictionary, has_key() method returns true if specified key is present in the dictionary, else returns false.
Syntax: dict.has_key(key)
Parameters:
- key – This is the Key to be searched in the dictionary.
Returns: Method returns true if a given key is available in the dictionary, otherwise it returns a false.
Example #1:
- Python
# Python program to show working# of has_key() method in Dictionary# Dictionary with three itemsDictionary1 = {'A': 'Geeks', 'B': 'For', 'C': 'Geeks'}# Dictionary to be checkedprint("Dictionary to be checked: ")print(Dictionary1)# Use of has_key() to check# for presence of a key in Dictionaryprint(Dictionary1.has_key('A'))print(Dictionary1.has_key('For')) |
Output:
Dictionary to be checked:
{'A': 'Geeks', 'C': 'Geeks', 'B': 'For'}
True
False
Example #2:
- Python
# Python program to show working# of has_key() method in Dictionary# Dictionary with three itemsDictionary2 = {1: 'Welcome', 2: 'To', 3: 'Geeks'}# Dictionary to be checkedprint("Dictionary to be checked: ")print(Dictionary2)# Use of has_key() to check# for presence of a key in Dictionaryprint(Dictionary2.has_key(1))print(Dictionary2.has_key('To')) |
Output:
Dictionary to be checked:
{1: 'Welcome', 2: 'To', 3: 'Geeks'}
True
False
Note : dict.has_key() has removed from Python 3.x
has_key() has been removed in Python 3. in operator is used to check whether a specified key is present or not in a Dictionary.
Example:
- Python3
# Python Program to search a key in Dictionary# Using in operatordictionary = {1: "Geeks", 2: "For", 3: "Geeks"}print("Dictionary: {}".format(dictionary))# Return True if Present.if 1 in dictionary: # or "dictionary.keys()" print(dictionary[1])else: print("{} is Absent".format(1))# Return False if not Present.if 5 in dictionary.keys(): print(dictionary[5])else: print("{} is Absent".format(5)) |
Output:
Dictionary: {1:"Geeks",2:"For",3:"Geeks"}
Geeks
5 is Absent
Last Updated on November 13, 2021 by admin