In the previous chapter, we learned that we could issue the import math command to upload the math module in order to use its included functions. Similarly, we can use the import function here. In other words, we have to upload or import it. Since we have the test01. py file saved under our default directory (Python33 in C:), we will use it, as shown in the following code:

>>>import test01
>>>dir()
['__builtins__', '__doc__', '__file__', '__loader__', '__name__', '__package__', 'test01']
>>>test01.pv_f(100,0.1,1)
90.9090909090909

Since test01 could be treated the same way as the math module discussed in Chapter 2, Using Python as an Ordinary Calculator, we have to use test01.pv() instead of pv_f(). See the following comparison. The ceil() function offers the smallest integer that is bigger than the input value:

>>>import math
>>>math.ceil(3.5)
4
>>>import test01
>>>test01.pv_f...