添加pre_judge function

utils/functions.py

+#!/usr/bin/env python
+# -*- coding:utf-8 -*-
+
+def is_float(s):
+    xiaoshu_new=str(s)
+
+    if xiaoshu_new.count(".") ==1:
+       left,right = xiaoshu_new.split(".")
+       if left.isdigit() and right.isdigit():
+           return True
+
+       elif left.startswith('-') and left.count('-') == 1 and right.isdigit():
+            lleft = left.split('-')[-1]
+            if lleft.isdigit():
+                return True
+
+    return False
+def pre_judge(kw):
+    if is_float(kw) or len(kw) == 1 or kw.isdigit() or len(kw) >= 30:
+        return False
+
+    return True
\ No newline at end of file