On 31.10.2017 8:37, python-ideas-requ...@python.org wrote:
On Tue, Oct 31, 2017 at 3:50 PM, Ivan Pozdeev via Python-ideas
<python-ideas@python.org> wrote:
On 30.10.2017 17:32, Guido van Rossum wrote:
This is a key example of a case where code speaks. Can you write an
implementation of how you would want single() to work in Python code?
On Mon, Oct 30, 2017 at 2:49 AM, Ivan Pozdeev via Python-ideas
<python-ideas@python.org <mailto:python-ideas@python.org>> wrote:
The initial post on the above link summarizes the suggested
implementation pretty well.
|defsingle(i): try: ||v =i.next()
|||exceptStopIteration:||||raiseException('No values')|||try: ||i.next()
||exceptStopIteration: ||returnv||else: ||raiseException('Too many values')|
||printsingle(name forname in('bob','fred')ifname=='bob')||| |
||
raise WhitespaceDamagedException from None
ChrisA
Thunderbird jerked on me big time. It never did anything like this
before! Switched off Digest mode, individual messages aren't so complicated.
def single(i):
try:
v =i.next()
except StopIteration:
raise ValueError('No items')
try:
i.next()
except StopIteration:
return v
else:
raise ValueError('More than one item')
print single(name for name in('bob','fred') if name=='bob')
--
Regards,
Ivan
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