Collections with strings inside of it

There's difference between numerical and string behavior inside collections:

my_list = ['hello' 'this' 'is' 'my' 'message']
my_tuple = ('hello' 'this' 'is' 'my' 'message')
my_set = {'hello' 'this' 'is' 'my' 'message'}

The result in all cases going to be the same

['hellothisismymessage']
('hellothisismymessage')
{'hellothisismymessage'}

when we try to do the same with numerical types we get syntax error

>>> l = {1 2 3 4 5}
  File "<stdin>", line 1
    l = {1 2 3 4 5}
            ^
SyntaxError: invalid syntax