Client driver for YSQL / Python (#4)

* Client drivers for YSQL

* Client drivers for YSQL

* Client Drivers for YSQL / Java

* Client driver for YSQL / Go

* Addressed review comments

* Client drivers for YSQL / Python

* Put back redis section that was mistakenly removed

docs/content/latest/develop/client-drivers/python.md

@@ -24,6 +24,12 @@ menu:
       YEDIS
     </a>
   </li>
+  <li>
+    <a href="#ysql" class="nav-link" id="ysql-tab" data-toggle="tab" role="tab" aria-controls="ysql" aria-selected="false">
+      <i class="icon-ysql" aria-hidden="true"></i>
+      YSQL
+    </a>
+  </li>
 </ul>
 
 <div class="tab-content">
@@ -33,4 +39,7 @@ menu:
   <div id="redis" class="tab-pane fade" role="tabpanel" aria-labelledby="redis-tab">
     {{% includeMarkdown "redis/python.md" /%}}
   </div>
+  <div id="ysql" class="tab-pane fade" role="tabpanel" aria-labelledby="ysql-tab">
+    {{% includeMarkdown "ysql/python.md" /%}}
+  </div>
 </div>

docs/content/latest/develop/client-drivers/ysql/python.md

@@ -0,0 +1,71 @@
+
+## Installation
+
+Install the python PostgreSQL driver using the following command. You can get further details for the driver [here](https://pypi.org/project/psycopg2/).
+
+```sh
+$ pip install psycopg2-binary
+```
+
+## Working Example
+
+### Pre-requisites
+
+This tutorial assumes that you have:
+
+- installed YugaByte DB and created a universe with YSQL enabled. If not, please follow these steps in the [quick start guide](../../../quick-start/test-ysql/).
+
+
+### Writing the python code
+
+Create a file `yb-sql-helloworld.py` and add the following content to it.
+
+```python
+import psycopg2
+
+# Create the database connection.                                                                 
+conn = psycopg2.connect("host=127.0.0.1 port=5433 dbname=postgres user=postgres password=postgres")
+
+# Open a cursor to perform database operations                                                    
+cur = conn.cursor()
+
+# Create the table.                                                                               
+cur.execute(
+  """                                                                                             
+  CREATE TABLE employee (id int PRIMARY KEY,                                                      
+                         name varchar,                                                            
+                         age int,                                                                 
+                         language varchar);                                                       
+  """)
+print "Created table employee"
+
+# Insert a row.                                                                                   
+cur.execute("INSERT INTO employee (id, name, age, language) VALUES (%s, %s, %s, %s)",
+            (1, 'John', 35, 'Python'))
+print "Inserted (id, name, age, language) = (1, 'John', 35, 'Python')"
+
+# Query the row.                                                                                  
+cur.execute("SELECT name, age, language FROM employee WHERE id = 1;")
+row = cur.fetchone()
+print "Query returned: %s, %s, %s" % (row[0], row[1], row[2])
+
+# Close the connection.                                                                           
+cur.close()
+conn.close()
+```
+
+### Running the application
+
+To run the application, type the following:
+
+```sh
+$ python yb-sql-helloworld.py
+```
+
+You should see the following output.
+
+```
+Created table employee
+Inserted (id, name, age, language) = (1, 'John', 35, 'Python')
+Query returned: John, 35, Python
+```