[Tutor] beginsWith multiple prefixes

[Alan Gauld]

"Kent Johnson" <kent37 at tds.net> wrote 

>> for d in os.listdir():
>>   if MyString(d).upper().beginswith(....):
> 
> But that won't work, the result of calling upper() will be a normal
> str, not a MyString.

Ah yes. Immutability of strings strikes again. upper() returns 
a new string, I forgot about that. pity.

You can do

if MyString(d.upper()).beginswith(...)

But that loses a lot in elegance and is hardly better than 
using a fiunction.

Alan G