refactoring some code and added docstring

added stopwatch.py(modify from utils.timer.py) for test

utils/strfunctions.py

@@ -5,30 +5,26 @@ import re
 
 
 def sequential_rep(text_, *args):
+    # type: (basestring, *list) -> basestring
     """
-    params
-        text_: string content
-        args : <pattern>, <replacement>, <pattern>, <replacement>, ...
-
-    return
-        empty string when text_ length was zero or invalid.
+    :param text_: string content
+    :param args: like <pattern>, <replacement>, <pattern>, <replacement>, ...
+    :return: if text_ length was zero or invalid parameters then no manipulation to text_
     """
-
-    if not text_ or not len(text_):
-        return ""
-
     arg_len = len(args)
-    i = 0
-    while i < arg_len:
-        text_ = re.sub(args[i], args[i + 1], text_)
-        i += 2
+    if arg_len % 2 == 0 and isinstance(text_, basestring) and len(text_) > 0:
+        i = 0
+        while i < arg_len:
+            text_ = re.sub(args[i], args[i + 1], text_)
+            i += 2
 
     return text_
 
 
-def replaceLTGT(text_):
+def replace_ltgt(text_):
+    # type: (basestring) -> basestring
     """if fit name contained "<" or ">" then reprace to named html entity by EVE client.
-
-       for fit name.
+    :param text_: string content of fit name from exported by EVE client.
+    :return: if text_ is not instance of basestring then no manipulation to text_.
     """
-    return text_.replace("&lt;", "<").replace("&gt;", ">") if isinstance(text_, unicode) else text_
+    return text_.replace("&lt;", "<").replace("&gt;", ">") if isinstance(text_, basestring) else text_