Converting a list to a set changes element order

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Recently I noticed that when I am converting a list to set the order of elements is changed and is sorted by character.

Consider this example:

x=[1,2,20,6,210]
print(x)
# [1, 2, 20, 6, 210] # the order is same as initial order

set(x)
# set([1, 2, 20, 210, 6]) # in the set(x) output order is sorted

My questions are –

  1. Why is this happening?
  2. How can I do set operations (especially set difference) without losing the initial order?

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