Updated the code of format_strings.py and updated readme - (Solves #34)

3 - Comments/README.md

@@ -4,3 +4,12 @@ Comments start with a hash character (#) and allow you to document your code.
 Comments are ignored when code is executed.
 
 - [Comments](https://docs.python.org/3/reference/lexical_analysis.html?highlight=comment)
+
+“”” Docstrings ”””
+
+The docstrings are declared using “””triple double quotes”””.
+It gives programmers an easy way of adding quick notes with every Python module, function, class, and method.
+Note: The strings defined using triple-quotation mark are docstring in Python. However, it might appear to you as a regular comment.
+As long as the string is not assigned to a variable, Python will read the code, but then ignore it, and you have made a multiline comment.
+
+- [Docstrings](https://www.python.org/dev/peps/pep-0257/)

3 - Comments/comments_are_not_executed.py

@@ -2,3 +2,10 @@
 # print('Hello world')
 # print("Hello world")
 # No output will be displayed!
+"""
+	This is a docstring
+	written in
+	more than just one line.
+	It can be used as a multiline comment.
+"""
+

3 - Comments/docstrings.py

@@ -0,0 +1,10 @@
+def my_function():
+    """Do nothing, but document it.
+
+       This is a function docstring.
+    """
+
+    pass
+#In order to print or access the docstrings use __doc__. 
+print(my_function.__doc__)
+

4 - String variables/README.md

@@ -3,6 +3,7 @@
 Python can store and manipulate strings. Strings can be enclosed in single or double quotes. There are a number of string methods you can use to manipulate and work with strings
 
 - [strings](https://docs.python.org/3/tutorial/introduction.html#strings)
+- [format strings](https://docs.python.org/3.4/library/string.html#string-formatting)
 - [string methods](https://docs.python.org/3/library/stdtypes.html#string-methods)
 
 Converting to string values

4 - String variables/format_strings.py

@@ -2,7 +2,18 @@
 first_name = input('What is your first name? ')
 last_name = input('What is your last name? ')
 
-# the capitalize function will return the string with 
-# the first letter uppercase and the rest of the word lowercase
-print ('Hello ' + first_name.capitalize() + ' ' \
-       + last_name.capitalize())
+# Custom string formatting
+# Using the + operator to concatenate strings
+print ('Hello ' + first_name + ' '  + last_name)
+
+# Using place holders to print strings 
+print ('Hello, {} {} '.format(first_name, last_name)
+
+# Using index numbers {0} and {1} to be sure the arguments are placed in the correct placeholders 
+print ('Hello {0} {1}'.format(first_name, last_name)
+
+# Reversing the index numbers to change the positions of placeholders
+print ('Hello {1} {0}'.format(first_name, last_name)
+
+# Only available in Python 3
+print (f'Hello, {first_name} {last_name}')