Core Python Programming (2nd Edition)

3.0
arrrghhh
--------------------------------------------------
% loopmake.py
Loop type? (For/While) w
Data type? (Number/Sequence) s
Enter sequence: [932, 'grail', 3.0, 'arrrghhh']
Iterative variable name? eachIndex
Enter sequence name? myList
-------------------------------------------------
Your custom-generated code:
--------------------------------------------------
eachIndex = 0
myList = [932, 'grail', 3.0, 'arrrghhh']
while eachIndex < len(myList):
print myList[eachIndex]
eachIndex = eachIndex + 1
--------------------------------------------------
Test execution of the code:
--------------------------------------------------
932
grail
3.0
arrrghhh
--------------------------------------------------
Line-by-Line Explanation
Lines 125
In this first part of the script, we are setting up two global variables. The first is a static string consisting
of a line of dashes (hence the name) and the second is a dictionary of the skeleton code we will need to
use for the loops we are going to generate. The keys are "f" for a for loop, "s" for a while loop iterating
through a sequence, and "n" for a counting while loop.
Lines 2730
Here we prompt the user for the type of loop he or she wants and what data types to use.
Lines 3236
Numbers have been chosen; they provide the starting, stopping, and incremental values. In this section
of code, we are introduced to the input() BIF for the first time. As we shall see in Section 14.3.5, input
() is similar to raw_input() in that it prompts the user for string input, but unlike raw_input(), input()
also evaluates the input as a Python expression, rendering a Python object even if the user typed it in as
a string.
Lines 3839