On 12/23/2014 4:25 PM, Ben Finney wrote:
Ian Kelly <ian.g.ke...@gmail.com> writes:
On Tue, Dec 23, 2014 at 11:55 AM, Seb <splu...@gmail.com> wrote:
Particulary, what do the parentheses do there?
The parentheses enclose a generator expression, which is similar to a
list comprehension [1] but produce a generator, which is a type of
iterator, rather than a list.
To be clear: there's nothing about parentheses that produce a generator
expression.
Incorrect; parentheses *are* as a part of 'generator expression'. From
the doc:
generator_expression ::= "(" expression comp_for ")"
The generator expression is produced by the syntax used, such as
‘frob(spam) for spam in collection_of_spam if spam > 0’.
This is (intentionally) not a generator expression.
a = i for i in range(39)
is a syntax error, whereas
t = a, 3, '3'
binds 't' to the tuple a, 3, '3'.
The parentheses that are part of a generator expression may only be
omitted in a call with one argument. See my other response.
--
Terry Jan Reedy
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