Can I import Python's 3.6's formatted string literals (f-strings) into older 3.x, 2.x Python?

Question

The new Python 3.6 f-strings seem like a huge jump in string usability to me, and I would love to jump in and adopt them whole heartedly on new projects which might be runni

Answer 1

A dirty solution using simpleeval

import re
import simpleeval
test='_someString'
lst = ['_456']

s = '123123{lst[0]}{test}'

def template__format(template, context=None):
    if context is None:
        frame = inspect.currentframe()
        context = frame.f_back.f_locals        
        del frame
    ptn =  '([^{]?){([^}]+)}'
    class counter():
        i = -1

    def count(m):
        counter.i += 1
        return m.expand('\\1{%d}'%counter.i)

    template = re.sub(ptn,string=s, repl= count)
    exprs = [x[1] for x in re.findall(ptn,s)]
    vals = map(simpleeval.SimpleEval(names=context).eval,exprs)
    res = template.format(*vals)
    return res

print (template__format(s))