Replacing last comma in 'C1, C2, C3' with 'and' so that it reads 'C1, C2 and C3'

[Wolfram Kraus]

Ric Da Force wrote:
> Hi,
> 
> I have a string such as 'C1, C2, C3'.   Without assuming that each bit of 
> text is of fixed size, what is the easiest way to change this list so that 
> it reads:
> 'C1, C2 and C3' regardless of the length of the string.
> 
> Regards and sorry for the newbie question,
> 
> Ric 
> 
> 
Use rfind and slicing:

 >>> x = "C1, C2, C3"
 >>> x[:x.rfind(',')]+' and'+x[x.rfind(',')+1:]
'C1, C2 and C3'

HTH,
Wolfram