textread fgsub equivalent in python

fgsub.py

text = ['df dft sdf', 'sd fdggg sd dfhhh d', 'ddd']

def dbllttrwordrev(match):
    match = match.group()
    return '<<{}>>'.format(match[::-1])   

{
    'function': [re.sub("\\b\\w*([a-z])(\\1{2,})\\w*\\b", dbllttrwordrev, x, flags = re.IGNORECASE) for x in text],

    'lambda': [re.sub("\\b\\w*([a-z])(\\1{2,})\\w*\\b", lambda x: '<<{}>>'.format(x.group()[::-1]) , x, flags = re.IGNORECASE) for x in text]
}


def fgsub(text, pattern, fun, ignore_case = False):

    if ignore_case:
        case_flag = re.IGNORECASE
    else:
        case_flag = 0
       
    sub = re.sub
    
    return [sub(pattern, fun, x, flags = case_flag) if x is not None else None for x in text]




txt = [None, 'I want 32 grapes', 'he wants 4 ice creams', 'they want 1,234,567 dollars']
import re
import math

def number_half(match):
    return '{:,}'.format(math.ceil(int(re.sub('[^0-9]', '', match.group()))/2))
    #return [re.sub('[^0-9]', '', x) for x in text]
    
fgsub(txt, '[\\d,]+', number_half)

fgsub(txt, '[\\d,]+', lambda match: '{:,}'.format(math.ceil(int(re.sub('[^0-9]', '', match.group()))/2)))