The document discusses using Python in Mule applications. It describes how Python allows interceptors to alter message properties and be used for tasks like logging. Python scripts can trigger database transactions or modify web interfaces. It then provides examples of Python features like accessing substrings, integer arithmetic, input/output, and using range functions. It concludes by demonstrating a simple Hello World Python script configured in a Mule flow.

1. Python Component In Mule
The Python language has many similarities to Perl, C, and Java.
However, there are some definite differences between the
languages

2.  Python also allows the developer to configure
interceptors and alter the values or references of
particular properties in a script. Interceptors are
configured to provide additional services to a
message as it flows through a component. For
example, a developer can configure an
interceptor to execute scheduling or logging of a
particular event while a message is being
processed. The Python component also includes
a custom interceptor which allows you to
configure settings for Spring elements.
 The Python script is generally executed at
runtime (client-side request); the custom logic
embedded in the script can be used to trigger an
application to execute a database transaction, or
modify your web-page interface.

3.  Accessing Values in Strings
 Python does not support a character
type; these are treated as strings of
length one, thus also considered a
substring.
 To access substrings, use the square
brackets for slicing along with the index
or indices to obtain your substring. For
example −
 #!/usr/bin/python var1 = 'Hello World!'
var2 = "Python Programming" print
"var1[0]: ", var1[0] print "var2[1:5]: ",

4.  Here is a set of small scripts, which
demonstrate some features of Python
programming.
 # this is the first comment
 #! python
 # integer variables
 SPAM = 1
 #! python print "Hello, Python"
 #! Python
 # string variable
 STRING = "# This is not a comment." print
STRING

5.  #! Python
 # integer arith
 a=4
 print a
 b=12+5
 print b
 c=b%a
 print c

6.  #! python
 # input and operator if
 x = int(raw_input("Please enter an integer: "))
 if x < 0:
 x = 0
 print 'Negative changed to zero'
 elif x == 0:
 print 'Zero'
 elif x == 1:
 print 'Single'
 else:
 print 'More'

7.  ! python
 # range function
 print range(10)
 print range(5, 10)
 print range(0, 10, 3)
 a = ['Mary', 'had', 'a', 'little', 'lamb']
 for i in range(len(a)):
 print i, a[i]

8. Create a New Project

9. Enter project name as
demo_python click on finish

10. Drag components as shown in
the below and configure Http

11. Drag python component and
configure as below

12. Paste in script
 #! python
 print "Hello, Python"

13. Run as Mule Application
 Hit the URL on browser:
 http://localhost:8081/python
 Hello, Python is the output