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Python | Test for nested list

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  • Last Updated : 05 Sep, 2019

Sometimes, while working with Python list, we might have a problem in which we need to find that a list is a Matrix or a list contains list as it’s element. This problem can come in Data Science domain as it involves use of Matrices more than often. Let’s discuss certain way in which this task can be performed.

Method : Using any() + isinstance()
The combination of above functions can be used to perform this task. The any() is used to check for each of the occurrence and isinstance() is used to check for list.

# Python3 code to demonstrate working of
# Test for nested list
# using any() + isinstance()
# initialize list
test_list = [[5, 6], 6, [7], 8, 10]
# printing original list
print("The original list is : " + str(test_list))
# Test for nested list
# using any() + isinstance()
res = any(isinstance(sub, list) for sub in test_list)
# printing result
print("Does list contain nested list ? : " + str(res))

Output :

The original list is : [[5, 6], 6, [7], 8, 10]
Does list contain nested list ? : True
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