a lot changes now I can not track :(

.tx/config

@@ -1,6 +1,7 @@
 [main]
-host = https://www.transifex.net
+host = https://www.transifex.com
 lang_map = aln:aln-AL, ar:ar-SA, as:as-IN, bal:bal-PK, bg:bg-BG, bn:bn-BD, bn_IN:bn-IN, bs:bs-BA, ca:ca-ES, cs:cs-CZ, da:da-DK, de_CH:de-CH, de:de-DE, el:el-GR, en_GB:en-GB, es:es-ES, et:et-EE, fa:fa-IR, fi:fi-FI, fr:fr-FR, gu:gu-IN, he:he-IL, hi:hi-IN, hr:hr-HR, hu:hu-HU, id:id-ID, is:is-IS, it:it-IT, ja:ja-JP, kn:kn-IN, ko:ko-KR, lt:lt-LT, lv:lv-LV, mai:mai-IN, ml:ml-IN, mr:mr-IN, ms:ms-MY, nb:nb-NO, nds:nds-DE, nl:nl-NL, nn:nn-NO, or:or-IN, pa:pa-IN, pl:pl-PL, pt_BR:pt-BR, pt:pt-PT, ro:ro-RO, ru:ru-RU, si:si-LK, sk:sk-SK, sl:sl-SI, sq:sq-AL, sr:sr-RS, sr@latin:sr-Latn-RS, sv:sv-SE, ta:ta-IN, te:te-IN, tr:tr-TR, uk:uk-UA, ur:ur-PK, vi:vi-VN, zh_CN:zh-CN, zh_HK:zh-HK, zh_TW:zh-TW
+type = PO
 
 [pym.acknowledgment]
 file_filter = <lang>/acknowledgment.po

en-US/classes.xml

@@ -5,10 +5,9 @@
 <chapter id="pythonforyouandme-classes">
 	<title>Class</title>
 	<para>
-		What is a <emphasis>class</emphasis>? In our daily life, we come across many objects which are similar kind or in words which are basically same. For example we can think about a car. There are different brands , color, look, style, parts, but basically they all are cars. All them of are made by different companies but with similar kind of components.
 	</para>
 	<para>
-		We can say all of them are different instances of the <emphasis>class</emphasis> car. They all belongs to the car class. Every instance is known as an <emphasis>object</emphasis> in computer world. A <emphasis>class</emphasis> can contain variables or methods to access those variables.In Python everything is an <emphasis>object</emphasis>. Even if you create an integer, that is an object of the <emphasis>Integer class</emphasis>. In C++ this is different.
+
 	</para>
 	<section id="pythonforyouandme-Classes-firstclass">
 		<title>Your first class</title>

en-US/functions.xml

@@ -133,6 +133,20 @@ True]]>
 >>> print f(3)
 [1, 2, 3]]]>
 </programlisting>
+	<para>
+	    To avoid this you can write more idiomatic Python, like the following
+	</para>
+	<programlisting language="Python"><![CDATA[>>> def f(a, data=None):
+    if data is None:
+        data = []
+    data.append(a)
+    return data
+
+>>> print f(1)
+[1]
+>>> print f(2)
+[2]]]>
+	</programlisting>
 	</section>
 
 	<section id="pythonforyouandme-Functions-keyword">
@@ -159,6 +173,7 @@ SyntaxError: non-default argument follows default argument]]>
 	</section>
 	<section id="pythonforyouandme-Functions-doctstrings">
 		<title>Docstrings</title>
+		<indexterm><primary>Docstrings</primary><secondary>Docstrings in Python</secondary></indexterm>
 		<para>
 			In Python we use docstrings to explain how to use the code, it will be useful in interactive mode and to create auto-documentation. Below we see an example of the docstring for a function called <emphasis>longest_side</emphasis>.
 		</para> 

en-US/looping.xml

@@ -243,6 +243,7 @@ Enter the number of rows: 5
 
 	<section id="pythonforyouandme-Looping-lists">
 		<title>Lists</title>
+        <indexterm><primary>List</primary><secondary>List datastructure</secondary></indexterm>
 		<para>
 			We are going to learn a data structure called list before we go ahead to learn more on looping. Lists an be written as a list of comma-separated values (items) between square brackets.
 		</para>

en-US/modules.xml

@@ -9,7 +9,8 @@
 	</para>
 	<section id="pythonforyouandme-Modules-introduction">
 		<title>Introduction</title>
-		<para>
+		<indexterm><primary>Module</primary><secondary>Python modules</secondary></indexterm>
+        <para>
 			Still now when ever we wrote code in the python interpreter, after we came out of it, the code was lost. But in when one writes a larger program, people breaks their codes into different files and reuse then as required. In python we do this by <emphasis>modules</emphasis>. Modules are nothing files with Python definitions and statements. The module name is same as the file name without the .py extension.
 		</para>
                 <para>
@@ -120,6 +121,11 @@ help> modules
     <para>
     The above example shows how to get the list of all installed modules in your system. I am not pasting them here as it is a big list in my system :)
     </para>
+    <para>
+        You can also use <emphasis>help()</emphasis> function in the interpeter to find documentation about any module/classes. Say you want to know all available methods in strings, you can use the following method
+    </para>
+    <programlisting language="Python"><![CDATA[>>> help(str)]]>
+    </programlisting>         
     </section>
     <section id="pythonforyouandme-Modules-submodules">
         <title>Submodules</title>
@@ -135,51 +141,41 @@ mymodule
 ]]>
 </screen>
     <para>
-        In this example <emphasis>mymodule</emphasis> is the module name and <emphasis>bars</emphasis> and <emphasis>utils</emphasis> are two submodules in it.
+        In this example <emphasis>mymodule</emphasis> is the module name and <emphasis>bars</emphasis> and <emphasis>utils</emphasis> are two submodules in it. You can create an empty <emphasis>__init__.py</emphasis> using touch command.
     </para>
+    <programlisting language="Python"><![CDATA[$ touch mymodule/__init__.py]]>
+    </programlisting>         
     </section>
     <section id="pythonforyouandme-Modules-os">
 	<title>Module os</title>
 	<para>
 	os module provides operating system dependent functionality. You can import it using the following import statement.
 	</para>
 <programlisting language="Python">
-<![CDATA[>>> import os
-
-]]>
+<![CDATA[>>> import os]]>
 </programlisting>
    <para>
    <emphasis>getuid()</emphasis> function returns the current process's effective user's id.
    </para> 
 <programlisting language="Python">
-<![CDATA[
->>> os.getuid()
-500
-
-]]>
+<![CDATA[>>> os.getuid()
+500]]>
 </programlisting>
     <para>
     <emphasis>getpid()</emphasis> returns the current process's id. <emphasis>getppid()</emphasis> returns the parent process's id.
     </para>
 <programlisting language="Python">
-<![CDATA[
->>> os.getpid()
+<![CDATA[>>> os.getpid()
 16150
 >>> os.getppid()
-14847
-
-
-]]>
+14847]]>
 </programlisting>
     <para>
-    <emphasis>uname()</emphasis> returns different information identifying the operating system, in Linux it returns details you can get from the uname command. The returned object is a tuple, <emphasis>(sysname, nodename, release, version, machine)</emphasis>
+    <emphasis>uname()</emphasis> returns different information identifying the operating system, in Linux it returns details you can get from the <emphasis>uname</emphasis> command. The returned object is a tuple, <emphasis>(sysname, nodename, release, version, machine)</emphasis>
     </para>
 <programlisting language="Python">
-<![CDATA[
->>> os.uname()
-('Linux', 'd80', '2.6.34.7-56.fc13.i686.PAE', '#1 SMP Wed Sep 15 03:27:15 UTC 2010', 'i686')
-
-]]>
+<![CDATA[>>> os.uname()
+('Linux', 'd80', '2.6.34.7-56.fc13.i686.PAE', '#1 SMP Wed Sep 15 03:27:15 UTC 2010', 'i686')]]>
 </programlisting>
     <para>
     <emphasis>getcwd()</emphasis>returns the current working directory. <emphasis>chdir(path)</emphasis> changes the current working directory to path. In the example we first see the current directory which is my home directory and change the current directory to <emphasis>/tmp</emphasis> and then again checking the current directory.
@@ -189,10 +185,31 @@ mymodule
 '/home/kushal'
 >>> os.chdir('/tmp')
 >>> os.getcwd()
-'/tmp'
-]]>
+'/tmp']]>
 </programlisting>
+
+    <para>
+        So let us use another function provided by the os module and create our own function to list all files and directories in any given directory. 
+    </para>
+<programlisting language="Python">
+<![CDATA[def view_dir(path='.'):
+    """
+    This function prints all files and directories in the given directory.
+
+    :args path: Path to the directory, default is current directory
+    """
+    names = os.listdir(path)
+    names.sort()
+    for name in names:
+        print name,]]>
+</programlisting>
+<programlisting language="Python">
+<![CDATA[>>> view_dir('/')
+.readahead bin boot dev etc home junk lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var]]>
+</programlisting>
+
+
 	</section>
-    
+
 </chapter>