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Why this is happening? I don't really understand:
>>> P = [ [()]*3 ]*3 >>> P [[(), (), ()], [(), (), ()], [(), (), ()]] >>> P[0][0]=1 >>> P [[1, (), ()], [1, (), ()], [1, (), ()]] 
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Multiply Two Python Lists Element-wise Using Numpy This means that the first element of one list is multiplied by the first element of the second list, and so on. , that allows us to multiply two arrays.
We can use numpy. prod() from import numpy to get the multiplication of all the numbers in the list. It returns an integer or a float value depending on the multiplication result.
This is the most straight forward method to perform this task. In this, we iterate the both the list and perform multiplication of each element with other and store result in new list. This is another way in which this task can be performed. In this, we perform the task of multiplication using product().
To multiply lists in Python, use the zip() function. You need to pass the lists into the zip(*iterables) function to get a list of tuples that pair elements with the same position from both lists. The zip() is a built-in Python function that creates an iterator that will aggregate elements from two or more iterables.
You've made 3 references to the same list.
>>> a = b = [] >>> a.append(42) >>> b [42] You want to do this:
P = [[()] * 3 for x in range(3)] Lists are mutable, and multiplying a list by a number doesn't copy its elements. You can try changing it to a list comprehension, so it will evaluate [()]*3 three times, creating three different lists:
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