There is some random class:

class MyClass: pass

You need 1 line to create n objects of this class.

    2 answers 2

     n = 5 obj_list = [MyClass() for _ in range(n)] print(obj_list)

      To create n objects:

       for _ in range(n): MyClass()

      To create and add n different objects to the list:

       L = [MyClass() for _ in range(n)]

      To create a list where the same object repeats n times:

       L = [MyClass()] * n

      This is more efficient and can be used if MyClass() is an immutable object in your task, for example, as numbers, strings, tuples in Python. Lazily, you can generate values ​​using itertools.repeat(MyClass(), n) .

      For simple types (like machine integers), there may be even more efficient options:

       In [1]: n = 1000_000 In [2]: %timeit [1] * n 3.27 ms ± 28.1 µs per loop (mean ± std. dev. of 7 runs, 100 loops each) In [3]: import array In [4]: %timeit array.array('Q', [1]) * n 829 µs ± 5.64 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each) In [5]: import numpy In [6]: %timeit numpy.ones(n, dtype='Q') 730 µs ± 5.32 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

      [1]*n is four times slower here than array('Q', [1])*n . numpy.ones(n, 'Q') is the fastest option presented.