From d376b6f78acdaa2824efe81c82b80212c802e019 Mon Sep 17 00:00:00 2001
From: Berker Peksag <berker.peksag@gmail.com>
Date: Mon, 23 Feb 2015 00:35:47 +0200
Subject: [PATCH] Raise TypeError instead of AssertionError.

assert statements will be removed if you run Python
in optimized mode (e.g. with -O flag).
---
 gunicorn/config.py    | 3 ++-
 gunicorn/http/wsgi.py | 9 ++++-----
 gunicorn/util.py      | 3 ++-
 3 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/gunicorn/config.py b/gunicorn/config.py
index bed4f759..ae387d31 100644
--- a/gunicorn/config.py
+++ b/gunicorn/config.py
@@ -268,7 +268,8 @@ class Setting(object):
         return self.value
 
     def set(self, val):
-        assert six.callable(self.validator), "Invalid validator: %s" % self.name
+        if not six.callable(self.validator):
+            raise TypeError('Invalid validator: %s' % self.name)
         self.value = self.validator(val)
 
     def __lt__(self, other):
diff --git a/gunicorn/http/wsgi.py b/gunicorn/http/wsgi.py
index fd545737..d9cef761 100644
--- a/gunicorn/http/wsgi.py
+++ b/gunicorn/http/wsgi.py
@@ -257,8 +257,8 @@ class Response(object):
 
     def process_headers(self, headers):
         for name, value in headers:
-            assert isinstance(name, string_types), "%r is not a string" % name
-
+            if not isinstance(name, string_types):
+                raise TypeError('%r is not a string' % name)
             value = str(value).strip()
             lname = name.lower().strip()
             if lname == "content-length":
@@ -322,9 +322,8 @@ class Response(object):
 
     def write(self, arg):
         self.send_headers()
-
-        assert isinstance(arg, binary_type), "%r is not a byte." % arg
-
+        if not isinstance(arg, binary_type):
+            raise TypeError('%r is not a byte' % arg)
         arglen = len(arg)
         tosend = arglen
         if self.response_length is not None:
diff --git a/gunicorn/util.py b/gunicorn/util.py
index 3f79fcbb..13e6d65d 100644
--- a/gunicorn/util.py
+++ b/gunicorn/util.py
@@ -503,7 +503,8 @@ def to_bytestring(value):
     """Converts a string argument to a byte string"""
     if isinstance(value, bytes):
         return value
-    assert isinstance(value, text_type)
+    if not isinstance(value, text_type):
+        raise TypeError('%r is not a string' % value)
     return value.encode("utf-8")