Contents
- 1 How do you check if multiple elements are present in a list?
- 2 How do you check if two elements are in the same list Python?
- 3 How do you check if a list has only one element?
- 4 How do I check if a list contains another list?
- 5 How to check for identical items in two different lists?
- 6 Which is the fastest way to compare lists?
How do you check if multiple elements are present in a list?
Check if list1 contains any elements of list2 using any() Python any() function checks if any Element of given Iterable is True. So, convert the list2 to Iterable and for each element in Iterable i.e. list2 check if any element exists in list1.
How do you check if two elements are in the same list Python?
Using Count() The python list method count() returns count of how many times an element occurs in list. So if we have the same element repeated in the list then the length of the list using len() will be same as the number of times the element is present in the list using the count(). The below program uses this logic.
How do I search a list within a list?
Use the syntax [element in list for list in list_of_lists] to get a list of booleans indicating whether element is in each list in list_of_lists . Call any(iterable) to return True if any element in the previous result iterable is True and False otherwise.
How do you check if a list has only one element?
In this sense, the most Pythonic way to check if a list has at least one element would be trying and access the element at index 0 . try: some_list[0] except IndexError: print(“some_list is empty”). Note that pop mutates the list, which is not what you want in a test.
How do I check if a list contains another list?
issubset() to check if a list is a subset of another list. Use set(list) to convert the lists to sets . Call set1. issubset(set2) to return a Boolean indicating whether set1 is a subset of set2 .
How to determine if two lists have the same elements?
Inferring from your example: that the elements of the lists won’t be repeated (they are unique) as well as hashable (which strings and other certain immutable python objects are), the most direct and computationally efficient answer uses Python’s builtin sets, (which are semantically like mathematical sets you may have learned about in school).
How to check for identical items in two different lists?
) else: print ( “These lists do NOT contain identical elements.” ) If you wish to join strings, or for the result to be a string, simply drop the int coercion: NOTE: It’s generally good practice on StackOverflow to ask one question per post, and to show us what you have tried.
Which is the fastest way to compare lists?
So we see that comparing sets is the fastest solution, and comparing sorted lists is second fastest. This seems to work, though possibly cumbersome for large lists.