What does this statement really do?

Question

I am new to python. Found a code online I am trying to understand. Can someone please help me understand what the following statement actually does?

    self.record = [random.choice([0.0, 1.0]) for _ in range(10)]

Answer 1

random.choice([0.0, 1.0])

The random.choice method will randomly pick an element of a given sequence. Here, it will randomly pick 0.0, or 1.0.

range(10)

This function will create a 10 element list (or iterable on python3)

[function() for _ in range(10)]

This is a list comprehension that will call a function 10 times, and place the results in a list. The _ is a python convention meaning "I need a variable here, but I won't use it's value"

[random.choice([0.0, 1.0]) for _ in range(10)]

This creates a list 10 elements long, where each element is either 0.0 or 1.0, randomly chosen.

self.record = [random.choice([0.0, 1.0]) for _ in range(10)]

This places the 10 element list into the instance variable record inside your current class.

It is equivalent to the following code

self.record = []
for _ in range(10):
    num = random.choice([0.0, 1.0])
    self.record.append(num)