The exec statement is used to execute Python statements which are
stored in a string or file. For example, we can generate a string containing Python code
at runtime and then execute these statements using the exec statement.
A simple example is shown below.
>>> exec 'print "Hello World"' Hello World
The eval statement is used to evaluate valid Python expressions
which are stored in a string. A simple example is shown below.
>>> eval('2*3')
6