On 14/03/2016 23:24, Steven D'Aprano wrote:
On Mon, 14 Mar 2016 06:39 am, BartC wrote:
class switch(object):
value = None
def __new__(class_, value):
class_.value = value
return True
def case(*args):
return any((arg == switch.value for arg in args))
That's quite a clever use of a class. By clever, I mean imaginative, not
necessarily smart.
I think so too. But it also looks inefficient.
Try this instead:
c = chr(c)
if 'A' <= c <= 'Z':
upper += 1
elif 'a' <= c <= 'z':
lower += 1
elif '0' <= c <= '9':
digits += 1
else:
other += 1
But even better:
if c.isupper():
upper += 1
elif c islower():
lower += 1
elif c.isdigit():
digits += 1
else:
other += 1
which will work correctly for non-ASCII characters as well.
Yes, but now you've destroyed my example!
A more realistic use of switch is shown below [not Python]. I've taken
out the code for each section, including various nested switches, to
show the test patterns better.
Now an if-elif chain won't perform as well.
doswitch p++^ # (looping switch)
when 'a'..'z','$','_' then
when '0'..'9' then
when 'A'..'Z' then
when '!' then
when '#' then
when '\\' then
when '{' then
when '}' then
when '.' then
when ',' then
when ';' then
when ':' then
when '(' then
when ')' then
when '[' then
when ']' then
when '|' then
when '^' then
when '@' then
when '?' then
when '£' then
when '~' then
when '¬' then
when '+' then
when '-' then
when '*' then
when '/' then
when '%' then
when '=' then
when '<' then
when '>' then
when '&' then
when '\'','`' then
when '"' then
when ' ','\t' then
when cr then
when lf then
when etx,0 then
else # unicode goes here...
end switch
--
Bartc
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