Initialize a list of objects in Python

Question

I\'m a looking to initialize an array/list of objects that are not empty -- the class constructor generates data. In C++ and Java I would do something like this:

Answer 1

You should note that Python's equvalent for Java code (creating array of 100 null references to Object):

Object arr = new Object[100];

or C++ code:

Object **arr = new Object*[100];

is:

arr = [None]*100

not:

arr = [Object() for _ in range(100)]

The second would be the same as Java's:

Object arr = new Object[100];
for (int i = 0; i < arr.lenght; i++) {
    arr[i] = new Object();
}

In fact Python's capabilities to initialize complex data structures are far better then Java's.

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Note: C++ code:

Object *arr = new Object[100];

would have to do as much work as Python's list comprehension:

• allocate continuous memory for 100 Objects

• call Object::Object() for each of this Objects

And the result would be a completely different data structure.