How would I go about making a list like
My_list = [['Item1', 'item2'], ['shark', 'dog', 'cat']]
To two lists like the following:
My_list = ['Item1', 'item2']
My_list2 = ['shark', 'dog', 'cat']
Also, how would I go about doing this if I didn't know how many lists were in the list?
You can use sequence unpacking:
My_list, My_list2 = My_list
If My_list can have more elements and you wanted to do something like:
for elem in My_list:
create_variable('My_listn', elem)
This is not possible in the general case. Python doesn't allow creating locals at runtime(at least not reliably).
globals()['variable_name'] = value, but this doesn't work for variables inside functions.Assuming My_list is really meant to look like:
My_list = [['Item1', 'item2'], ['shark', 'dog', 'cat']]
And also that you truly want what you are asking for, you could do something like:
My_list2 = My_list[1]
My_list = My_List[0]
Or, alternatively, as others are suggesting, you could use list unpacking:
My_list, My_list2 = My_list
>>> My_list = [['Item1', 'item2'], ['shark', 'dog', 'cat']]
>>> l1, l2 = My_list
>>> l1
['Item1', 'item2']
>>> l2
['shark', 'dog', 'cat']
My_list, My_list2 = My_list[0], My_list[1]
>>> My_list = ['Item1', 'item2'],['shark', 'dog', 'cat']
>>> My_list
(['Item1', 'item2'], ['shark', 'dog', 'cat'])
>>> len(My_list)
2
>>> My_list[0]
['Item1', 'item2']
>>> My_list[1]
['shark', 'dog', 'cat']
>>> My_list[2]
Traceback (most recent call last):
File "<pyshell#34>", line 1, in <module>
My_list[2]
IndexError: tuple index out of range
>>> My_list, My_list2 = My_list
>>> My_list
['Item1', 'item2']
>>> My_list2
['shark', 'dog', 'cat']
My_list = ['Item1', 'item2']['shark', 'dog', 'cat']? It is not a valid expression.My_list = ['Item1', 'item2', 'shark', 'dog', 'cat']then the answer is:sum(My_list,[])orlist(itertools.chain.from_iterable(My_list)). See also this related question.