import re 
from collections import Counter

with open("work_py/mbox-s.txt", "r", encoding="utf-8") as f : 
    lines = f.read()
    
    # 이메일 텍스트 파싱
    p = re.compile('^From\s.*$', re.MULTILINE)
    Froms = p.findall(lines)
    days = list(map(lambda x: x.split()[-5], Froms))
    days_str = ' '.join(days)
    
    # Friday 카운트
    cnt_Fri = Counter(days)['Fri']
    print(cnt_Fit)
    
with open("work_py/day-s.txt", "w", encoding="utf-8") as fd : 
    fd.write(days_str)