On 02/21/2014 02:26 PM, Eric V. Smith wrote:
On 2/21/2014 5:06 PM, Greg Ewing wrote:
On 21 February 2014 13:15, Chris Angelico wrote:
Generator expressions require parentheses, unless they would be
strictly redundant. Ambiguities with except expressions could be
resolved in the same way, forcing nested except-in-except trees to be
correctly parenthesized
There would be no ambiguity if only nested excepts are allowed. If one wants to catch multiple exceptions from one
expression, /and do something different for each one/, use the statement form as it's going to be clearer. For example:
try:
value = 1/x
except ZeroDivisionError:
try:
value = 1/default['denominator']
except KeyError:
value = NaN
is much cleaner as:
value = 1/x except ZeroDivisionError: 1/default['denominator'] except
KeyError: NaN
However, this:
try:
result = Parse(some_stuff)
except MissingOperator:
result = ...
except InvalidOperand:
result = ...
except SomethingElse:
result = ...
would not benefit from being condensed into a single expression
--
~Ethan~
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