update lib

scrapinglib/utils.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+
+from lxml.html import HtmlElement
+
+def getTreeElement(tree: HtmlElement, expr, index=0):
+    """ 根据表达式从`xmltree`中获取匹配值,默认 index 为 0
+    :param tree (html.HtmlElement)
+    :param expr 
+    :param index
+    """
+    if expr == '':
+        return ''
+    result = tree.xpath(expr)
+    try:
+        return result[index]
+    except:
+        return ''
+
+def getTreeAll(tree: HtmlElement, expr):
+    """ 根据表达式从`xmltree`中获取全部匹配值
+    :param tree (html.HtmlElement)
+    :param expr 
+    :param index
+    """
+    if expr == '':
+        return ''
+    result = tree.xpath(expr)
+    try:
+        return result
+    except:
+        return ''