More spec examples

Here’s another example of use:

from dulcinea.spec import any, sequence, require, match
L = [1,2,3,4]
test_is = any(str, sequence(int))


require(L, test_is)
    # used like an assert, returns None


match('some string', test_is)
    # returns True


require(1234, test_is)
    # raises TypeError: iteration over non-sequence


require([1,2,3,'4'], test_is)
    # raises 
    # TypeError:
    #   Expected: any(str, sequence(int, anything))
    #   Got: [1, 2, 3, '4']

Read the dulcinea.spec code for more insight – its just over 500 lines and the core is very straightforward