Python Forum

(May-01-2017, 03:38 PM)Ofnuts Wrote: [ -> ]don't use switch/case statements

That's funny, I just recently watched a video about HolyC's switch statement.  https://www.youtube.com/watch?v=tBQ69ZnuMbc (nsfw... just like everything related to TempleOS)

The short version is that he added start/end clauses to switch statements, to add additional pattern matching for groups of cases.  Additionally, it's worth noting that in HolyC, if you don't set a variable, it's sent to stdout, so each branch of the switch is echoing output (that might just be for strings, or single quoted strings, I'm not sure).

I64 i;
for (i=0;i<10;i++) {
    switch (i) {
        case 0: 'Zero\n'; break;
        case 1: 'One\n'; break;
        case 2: 'Two\n'; break;
        start:
            '[';
        case 3: 'Three'; break;
        case 4: 'Four'; break;
        case 5: 'Five'; break;
        case 6: 'Six'; break;
        end:
            ']\n';
            break;
        case 7: 'Seven\n'; break;
        case 8: 'Eight\n'; break;
        case 9: 'Nine\n'; break;
    }
}

Which is roughly the same as:

def wrapped(num):
   return '[{0}]'.format(num)

switch = {
   0: 'Zero', 1: 'One', 2: 'Two',
   3: lambda: wrapped('Three'),
   4: lambda: wrapped('Four'),
   5: lambda: wrapped('Five'),
   6: lambda: wrapped('Six'),
   7: 'Seven', 8: 'Eight', 9: 'Nine'
}

for i in range(10):
   val = switch[i]
   # the same as a `if` in this example
   while callable(val):
       val = val()
   print(val)

Output:
Zero
One
Two
[Three]
[Four]
[Five]
[Six]
Seven
Eight
Nine

>>> from __future__ import braces
  File "<stdin>", line 1
SyntaxError: not a chance

Really. Try it yourself.

(May-02-2017, 05:49 AM)Mekire Wrote: [ -> ]

>>> from __future__ import braces
  File "<stdin>", line 1
SyntaxError: not a chance

Really. Try it yourself.

Someone has a good taste - and a nice sense of humor . I tried - just out of curiosity