Python check if all elements in a list are Nan [duplicate]

Question

My code sometimes produces a list of nan's op_list = [nan, nan, nan, nan, nan, nan, nan, nan, nan, nan]. I want to know if all elements are nans.

My code and present output:

  op_list = [nan, nan, nan, nan, nan, nan, nan, nan, nan, nan]
  print(np.isnan(op_list))
array([ True,  True,  True,  True,  True,  True,  True,  True,  True,
        True])

My expected output:

   True

Answer 1

You need all:

np.isnan(op_list).all()
# True

For a solution using lists you can do:

all(i != i for i in op_list)
# True