python dynamic code execution, exec exaqmple

Dynamic code execution is very important in some cases. Sometimes we need to generate code dynamically and then run it. Lets see a very simple example using exec:

 
v=5

code = """def myFun():
            global v
            v=10
            print 'This is my function'
       """
exec code

print v
myFun() #must execute the code before calling function
print v

Output:

5
This is my function
10