[Tutor] Using 'join ' function to create a string

[bob gailer]

lechtlr wrote:
> Hi there,
>
> I would like to know what is the best way to create a string object 
> from two different lists using 'join' function. For example, I have X 
> = ['a', 'b', 'c', 'd', 'e'] and Y = [1, 2, 3, 4, 5]. From X and Y, I 
> want to create a string Z = 'a:1, b:2, c:3, d:4, e:5'.

Best way? Depends on what you mean by "best".

My solution:

Z = ', '.join(i+':'+str(j) for i, j in zip(X,Y))

It's interesting to note how close your output is to a dictionary display:

dict(zip(X,Y)) -> {'a': 1, 'c': 3, 'b': 2, 'e': 5, 'd': 4}

BTW is is customary in Python to start variable names with lower case 
letters (x,y,z) in this case.
Title case  is then used for Classes
CAPS is used for CONSTANTS