Python for Finance - Second Edition

Python loops

In this section, we discuss a very important concept: loop or loops. A loop is used to repeat the same task with slightly different input or other factors.

Python loops, if...else conditions

Let's look at a simple loop through all the data items in an array:

>>>import numpy as np
>>>cashFlows=np.array([-100,50,40,30])
>>>for cash in cashFlows:
...    print(cash)
... 
-100
50
40
30

One type of data is called a tuple, where we use a pair of parentheses, (), to include all input values. One feature of a tuple variable is that we cannot modify its value. This special property could be valuable if some our variables should never be changed.A tuple is different from a dictionary, which stores data with key-value pairs. It is not ordered and it ...