Micro-optimization: replace s.find(x)!=-1 with x in s

timeit shows a speedup of ~3x on Python 2.7.5 x86_64.
It also makes the code a bit shorter.

lib/ansible/module_utils/known_hosts.py

@@ -98,7 +98,7 @@ def not_in_host_file(self, host):
             host_fh.close()
 
         for line in data.split("\n"):
-            if line is None or line.find(" ") == -1:
+            if line is None or " " not in line:
                 continue
             tokens = line.split()
             if tokens[0].find(HASHED_KEY_MAGIC) == 0:

lib/ansible/utils/__init__.py

@@ -314,7 +314,7 @@ def parse_json(raw_data):
             raise
 
         for t in tokens:
-            if t.find("=") == -1:
+            if "=" not in t:
                 raise errors.AnsibleError("failed to parse: %s" % orig_data)
             (key,value) = t.split("=", 1)
             if key == 'changed' or 'failed':
@@ -1035,7 +1035,7 @@ def listify_lookup_plugin_terms(terms, basedir, inject):
             # not sure why the "/" is in above code :)
             try:
                 new_terms = template.template(basedir, "{{ %s }}" % terms, inject)
-                if isinstance(new_terms, basestring) and new_terms.find("{{") != -1:
+                if isinstance(new_terms, basestring) and "{{" in new_terms:
                     pass
                 else:
                     terms = new_terms

library/cloud/gc_storage

@@ -154,7 +154,7 @@ def keysum(module, gs, bucket, obj):
     key_check = bucket.get_key(obj)
     if key_check:
         md5_remote = key_check.etag[1:-1]
-        etag_multipart = md5_remote.find('-')!=-1 #Check for multipart, etag is not md5
+        etag_multipart = '-' in md5_remote # Check for multipart, etag is not md5
         if etag_multipart is True:
             module.fail_json(msg="Files uploaded with multipart of gs are not supported with checksum, unable to compute checksum.")
     return md5_remote

library/cloud/s3

@@ -147,7 +147,7 @@ def keysum(module, s3, bucket, obj):
     key_check = bucket.get_key(obj)
     if key_check:
         md5_remote = key_check.etag[1:-1]
-        etag_multipart = md5_remote.find('-')!=-1 #Check for multipart, etag is not md5
+        etag_multipart = '-' in md5_remote # Check for multipart, etag is not md5
         if etag_multipart is True:
             module.fail_json(msg="Files uploaded with multipart of s3 are not supported with checksum, unable to compute checksum.")
     return md5_remote