In Python, Dictionary is a collection of unordered data values. Dictionaries are also changeable and indexed. Dictionary holds key:value pair and they are written inside curly brackets. Each key:value pair maps the key to its associated value.
Here we use isinstance() method to check the type of the value whether it is a list, int, str, tuple, etc. isinstance() method which is an inbuilt method in Python. It returns a boolean if the object passed is an instance of the given class or not.
Let’s discuss different methods to find the length of dictionary values.
Note: In the below methods the length of the string value is takes as one.
Method #1 Using in operator
Example: 1
# Python program to find the # length of dictionary values def main(): # Defining the dictionary dict1 = {'a':[1, 2, 3], 'b'🙁1, 2, 3), 'c':5, 'd':"nopqrs", 'e':["A", "B", "C"]} # Initialize count count = 0 # using in operator for k in dict1: # Check the type of value # is int or not if isinstance(dict1[k], int): count += 1 # Check the type of value # is str or not elif isinstance(dict1[k], str): count += 1 else: count += len(dict1[k]) print("The total length of value is:", count) # Driver Code if __name__ == '__main__': main() |
Output:
The total length of value is: 11
Example :2
# Python program to find the # length of dictionary values def main(): # Defining the dictionary dict1 = {'A':"abcd", 'B':set([1, 2, 3]), 'C'🙁12, "number"), 'D':[1, 2, 4, 5, 5, 5]} # Create a empty dictionary dict2 = {} # using in operator for k in dict1: # Check the type of value # is int or not if isinstance(dict1[k], int): dict2[k] = 1 # Check the type of value # is str or not elif isinstance(dict1[k], str): dict2[k] = 1 else: dict2[k] = len(dict1[k]) print("The length of values associated\ with their keys are:", dict2) print("The length of value associated\ with key 'B' is:", dict2['B']) # Driver Code if __name__ == '__main__': main() |
Output:
The length of values associated with their keys are: {‘A’: 1, ‘B’: 3, ‘C’: 2, ‘D’: 6}
The length of value associated with key ‘B’ is: 3
Method #2 Using list comprehension
# Python program to find the # length of dictionary values def main(): # Defining the dictionary dict1 = {'a':[1, 2, 3], 'b'🙁1, 2, 3), 'c':5, 'd':"nopqrs", 'e':["A", "B", "C"]} # using list comprehension count = sum([1 if isinstance(dict1[k], (str, int)) else len(dict1[k]) for k in dict1]) print("The total length of values is:", count) # Driver Code if __name__ == '__main__': main() |
Output:
The total length of values is: 11
Method #3 Using dictionary Comprehension
# Python program to find the # length of dictionary values def main(): # Defining the dictionary dict1 = {'A': "abcd", 'B': set([1, 2, 3]), 'C': (12, "number"), 'D': [1, 2, 4, 5, 5, 5]} # using dictionary comprehension dict2 = {k:1 if isinstance(dict1[k], (str, int)) else len(dict1[k]) for k in dict1} print("The length of values associated \ with their keys are:", dict2) print("The length of value associated \ with key 'B' is:", dict2['B']) # Driver Code if __name__ == '__main__': main() |
Output:
The length of values associated with their keys are: {‘A’: 1, ‘B’: 3, ‘C’: 2, ‘D’: 6}
The length of value associated with key ‘B’ is: 3
Method #4 Using dict.items()
Example :1
# Python program to find the # length of dictionary values def main(): # Defining the dictionary dict1 = {'a':[1, 2, 3], 'b'🙁1, 2, 3), 'c':5, 'd':"nopqrs", 'e':["A", "B", "C"]} # Initialize count count = 0 # using dict.items() for key, val in dict1.items(): # Check the type of value # is int or not if isinstance(val, int): count += 1 # Check the type of value # is str or not elif isinstance(val, str): count += 1 else: count += len(val) print("The total length of value is:", count) # Driver code if __name__ == '__main__': main() |
Output:
The total length of values is: 11
Example :2
# Python program to find the # length of dictionary values def main(): # Defining the dictionary dict1 = {'A': "abcd", 'B': set([1, 2, 3]), 'C': (12, "number"), 'D': [1, 2, 4, 5, 5, 5]} # Create a empty dictionary dict2 = {} # using dict.items() for key, val in dict1.items(): # Check the type of value # is int or not if isinstance(val, int): dict2[key] = 1 # Check the type of value # is str or not elif isinstance(val, str): dict2[key] = 1 else: dict2[key] = len(val) print("The length of values associated \ with their keys are:", dict2) print("The length of value associated \ with key 'B' is:", dict2['B']) # Driver Code if __name__ == '__main__': main() |
Output:
The length of values associated with their keys are: {‘A’: 1, ‘B’: 3, ‘C’: 2, ‘D’: 6}
The length of value associated with key ‘B’ is: 3
Method #5 Using enumerate()
Example :1
# Python program to find the # length of dictionary values def main(): # Defining the dictionary dict1 = {'a':[1, 2, 3], 'b'🙁1, 2, 3), 'c':5, 'd':"nopqrs", 'e':["A", "B", "C"]} # Initialize count count = 0 # using enumerate() for k in enumerate(dict1.items()): # Check the type of value # is int or not if isinstance(k[1][1], int): count += 1 # Check the type of value # is str or not elif isinstance(k[1][1], str): count += 1 else: count += len(k[1][1]) print("The total length of value is:", count) # Driver Code if __name__ == '__main__': main() |
Output:
The total length of value is: 11
Example :2
# Python program to find the # length of dictionary values def main(): # Defining the dictionary dict1 = {'A': "abcd", 'B': set([1, 2, 3]), 'C': (12, "number"), 'D': [1, 2, 4, 5, 5, 5]} # Create a empty dictionary dict2 = {} # using enumerate() for k in enumerate(dict1.items()): # Check the type of value # is int or not if isinstance(k[1][1], int): dict2[k[1][0]] = 1 # Check the type of value # is str or not elif isinstance(k[1][1], str): dict2[k[1][0]] = 1 else: dict2[k[1][0]] = len(k[1][1]) print("The length of values associated\ with their keys are:", dict2) print("The length of value associated \ with key 'B' is:", dict2['B']) # Driver Code if __name__ == '__main__': main() |
Output:
The length of values associated with their keys are: {‘A’: 1, ‘B’: 3, ‘C’: 2, ‘D’: 6}
The length of value associated with key ‘B’ is: 3
