On 6 April 2014 20:07, Chris Angelico rosuav-at-gmail.com
|python-list@python.org| <d7v3zta...@sneakemail.com> wrote:
> Here's a simpler form of the proposal, which might cover what you
> need. It's basically a short-hand if/elif tree.
>
> case expression comp_op expression:
> suite
> case [comp_op] expression:
> suite
> ....
> else:
> suite
I like this solution, but I tought about a simpler one. Basically it's my first
proposal with two modifications:
1. case / elcase instead of continue, as before
2. if the case expression is a *tuple* (and not any one iterable), case suite
is executed if the switched expression is an element of the tuple.
If you want to match exactly a tuple, you have simply to put it into another
tuple of length 1. Tricky but too much rare to care about.
To recap:
switch_stmt ::= "switch" expression "case" expression_list ":" suite
("case" | "elcase" expression_list ":" suite)*
["else" ":" suite]
1. if expression_list is a tuple, the case suite will be executed if the switch
expression is a member of the tuple.
2. if expression_list is not a tuple, the case suite will be executed if the
switch expression is equal
Example:
briefing_days = ("Tue", "Thu")
normal_days = ("Mon", "Wed", "Fri")
switch day normal_days + briefing_days:
go_to_work = True
day_type = "weekday"
case normal_days:
lunch_time = datetime.time(12)
meeting_time = datetime.time(14)
elcase briefing_days:
lunch_time = datetime.time(11, 30)
meeting_time = datetime.time(12, 30)
else:
go_to_work = False
day_type = "festive"
lunch_time = None
meeting_time =None
Another example:
switch tarot case 0:
card = "Fool"
case 1:
card = "Alan Moore"
case 2:
card = "High Priestess"
etc.
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