统计QQ聊天群中各个账号的发言次数（该版本未使用正则表达式）

第一步导出聊天记录（此聊天记录只能导出本机的，不是服务器上的哦~~）

INPUT_FILE = "qq_chat_history.txt"

HEADER_START = b"2013"
(START_QQ, LINE_END_QQ) = (b"(", b")\r\n")
(START_EMAIL, LINE_END_EMAIL) = (b"<", b">\r\n")

with open(INPUT_FILE, "rb") as f:
  records = {}
  for line in f:
    if not line.startswith(HEADER_START):
      continue
    if line.endswith(LINE_END_QQ):
      qq_start = line.rfind(START_QQ)
      if qq_start == -1:
        continue
      qq = line[qq_start+1 : -len(LINE_END_QQ)]
      if not qq.isdigit():
        continue
      records[qq] = records.get(qq, 0) + 1
    elif line.endswith(LINE_END_EMAIL):
      email_start = line.rfind(START_EMAIL)
      if email_start == -1:
        continue
      email = line[email_start+1 : -len(LINE_END_EMAIL)]
      if email.count(b"@") != 1:
        continue
      records[email] = records.get(email, 0) + 1
  for (k, v) in sorted(records.items(), key=lambda item: item[1]):
    print("{0} => {1}".format(k.decode(), v))