Which float precision are NumPy arrays by default?

Question

I wonder which format floats are in NumPy array by default. (or do they even get converted when declaring a np.array? if so how about python lists?) e.g. float16, float32, or float64?

Answer 1

float64. You can check it like

>>> np.array([1, 2]).dtype
dtype('int64')
>>> np.array([1., 2]).dtype
dtype('float64')