trafaret.utils — utils for unfolding netsted dict syntax

There will be small helpers to render forms with exist trafarets for DRY.

trafaret.utils.fold(data, prefix='', delimeter='__')

>>> _dd(fold({'a__a': 4}))
"{'a': {'a': 4}}"
>>> _dd(fold({'a__a': 4, 'a__b': 5}))
"{'a': {'a': 4, 'b': 5}}"
>>> _dd(fold({'a__1': 2, 'a__0': 1, 'a__2': 3}))
"{'a': [1, 2, 3]}"
>>> _dd(fold({'form__a__b': 5, 'form__a__a': 4}, 'form'))
"{'a': {'a': 4, 'b': 5}}"
>>> _dd(fold({'form__a__b': 5, 'form__a__a__0': 4, 'form__a__a__1': 7}, 'form'))
"{'a': {'a': [4, 7], 'b': 5}}"
>>> repr(fold({'form__1__b': 5, 'form__0__a__0': 4, 'form__0__a__1': 7}, 'form'))
"[{'a': [4, 7]}, {'b': 5}]"

trafaret.utils.unfold(data, prefix='', delimeter='__')

>>> _dd(unfold({'a': 4, 'b': 5}))
"{'a': 4, 'b': 5}"
>>> _dd(unfold({'a': [1, 2, 3]}))
"{'a__0': 1, 'a__1': 2, 'a__2': 3}"
>>> _dd(unfold({'a': {'a': 4, 'b': 5}}))
"{'a__a': 4, 'a__b': 5}"
>>> _dd(unfold({'a': {'a': 4, 'b': 5}}, 'form'))
"{'form__a__a': 4, 'form__a__b': 5}"