Nested arguments in str.format #1707
Description
micropython:
>>> str.format("{text:{align}{width}}", text="foo", align="^", width=20)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid format specifiercpython 3.4.3:
>>> str.format("{text:{align}{width}}", text="foo", align="^", width=20)
' foo 'I read #407 and #574 (as wiki said). I understand, that core contributors probably don't like str.format and str.format not fully supported, but I prefer this method of string formatting and want this to be implemented.