How to find length of dictionary values?
Last Updated :
10 May, 2020
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
Python3 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()
The total length of value is: 11
Example :2
Python3 1==
# 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()
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
Python3 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"]}
# 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()
The total length of values is: 11
Method #3 Using dictionary Comprehension
Python3 1==
# 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()
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
Python3 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()
The total length of values is: 11
Example :2
Python3 1==
# 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()
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
Python3 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()
The total length of value is: 11
Example :2
Python3 1==
# 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()
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
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