<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def f(s):
 """ Basic support for 3.6's f-strings, in 3.5! Formats "s" using appropriate globals and locals dictionaries. This f-string: f"hello a is {a}" simply becomes f("hello a is {a}") In other words, just throw parentheses around the string, and you're done! Implemented internally using str.format_map(). This means it doesn't support expressions: f("two minus three is {2-3}") And it doesn't support function calls: f("how many elements? {len(my_list)}") But most other f-string features work. """

    frame = sys._getframe(1)
    d = dict(builtins.__dict__)
    d.update(frame.f_globals)
    d.update(frame.f_locals)
    return s.format_map(d)