# Count number of items in a dictionary value that is a list in Python

PythonServer Side ProgrammingProgramming

We are given a Dictionary in which the values from the key value pair itself is a list. In this article we will see a how to count the number of items in this list which are present as values in the dictionary.

## With isinstance

Hindi suppose we use isinstance function to find out if the value of the dictionary is a list. Then we increment a count variable whenever isinstance returns true.

## Example

Live Demo

# defining the dictionary
Adict = {'Days': ["Mon","Tue","wed","Thu"],
'time': "2 pm",
'Subjects':["Phy","Chem","Maths","Bio"]
}
print("Given dictionary:\n",Adict)
count = 0
# using isinstance
for x in Adict:
if isinstance(Adict[x], list):
count += len(Adict[x])
print("The number of elements in lists: \n",count)

## Output

Running the above code gives us the following result −

Given dictionary:
{'Days': ['Mon', 'Tue', 'wed', 'Thu'], 'time': '2 pm', 'Subjects': ['Phy', 'Chem', 'Maths', 'Bio']}
The number of elements in lists:
8

## With items()

Which items() we loop through each of the element of the dictionary and apply isinstance function to find out if it is a list.

## Example

Live Demo

# defining the dictionary
Adict = {'Days': ["Mon","Tue","wed","Thu"],
'time': "2 pm",
'Subjects':["Phy","Chem","Maths","Bio"]
}
print("Given dictionary:\n",Adict)
count = 0
# using .items()
for key, value in Adict.items():
if isinstance(value, list):
count += len(value)
print("The number of elements in lists: \n",count)

## Output

Running the above code gives us the following result −

Given dictionary:
{'Days': ['Mon', 'Tue', 'wed', 'Thu'], 'time': '2 pm', 'Subjects': ['Phy', 'Chem', 'Maths', 'Bio']}
The number of elements in lists:
8

## With enumerate

The enumerate function also expands and lists the items of a dictionary. We apply is instance to find out the values which are lists.

## Example

Live Demo

# defining the dictionary
Adict = {'Days': ["Mon","Tue","wed","Thu"],
'time': "2 pm",
'Subjects':["Phy","Chem","Maths","Bio"]
}
print("Given dictionary:\n",Adict)
count = 0
for x in enumerate(Adict.items()):
if isinstance(x[1][1], list):
count += len(x[1][1])
print(count)
print("The number of elements in lists: \n",count)

## Output

Running the above code gives us the following result −

Given dictionary:
{'Days': ['Mon', 'Tue', 'wed', 'Thu'], 'time': '2 pm', 'Subjects': ['Phy', 'Chem', 'Maths', 'Bio']}
8
The number of elements in lists:
8
Published on 04-Jun-2020 11:21:38
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