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-rw-r--r--bs4/__init__.py10
1 files changed, 7 insertions, 3 deletions
diff --git a/bs4/__init__.py b/bs4/__init__.py
index 64f8df9..23afa91 100644
--- a/bs4/__init__.py
+++ b/bs4/__init__.py
@@ -149,7 +149,7 @@ class BeautifulSoup(Tag):
features = self.DEFAULT_BUILDER_FEATURES
builder_class = builder_registry.lookup(*features)
if builder_class is None:
- raise ValueError(
+ raise FeatureNotFound(
"Couldn't find a tree builder with the features you "
"requested: %s. Do you need to install a parser library?"
% ",".join(features))
@@ -208,10 +208,10 @@ class BeautifulSoup(Tag):
return navigable
def insert_before(self, successor):
- raise ValueError("BeautifulSoup objects don't support insert_before().")
+ raise NotImplementedError("BeautifulSoup objects don't support insert_before().")
def insert_after(self, successor):
- raise ValueError("BeautifulSoup objects don't support insert_after().")
+ raise NotImplementedError("BeautifulSoup objects don't support insert_after().")
def popTag(self):
tag = self.tagStack.pop()
@@ -348,6 +348,10 @@ class StopParsing(Exception):
pass
+class FeatureNotFound(ValueError):
+ pass
+
+
#By default, act as an HTML pretty-printer.
if __name__ == '__main__':
import sys