cleanup: replace more naked excepts with more specific ones

mercurial/ui.py

@@ -488,9 +488,9 b' class ui(object):'
 
     def flush(self):
         try: self.fout.flush()
-        except: pass
+        except (IOError, ValueError): pass
         try: self.ferr.flush()
-        except: pass
+        except (IOError, ValueError): pass
 
     def interactive(self):
         '''is interactive input allowed?

mercurial/util.py

@@ -762,7 +762,7 b' def mktempcopy(name, emptyok=False, crea'
         ofp.close()
     except:
         try: os.unlink(temp)
-        except: pass
+        except OSError: pass
         raise
     return temp
 

tests/tinyproxy.py

@@ -47,7 +47,7 b' class ProxyHandler (BaseHTTPServer.BaseH'
         try: soc.connect(host_port)
         except socket.error, arg:
             try: msg = arg[1]
-            except: msg = arg
+            except (IndexError, TypeError): msg = arg
             self.send_error(404, msg)
             return 0
         return 1