Calvin Spealman wrote:
On Sat, Jun 20, 2009 at 9:22 AM, MRAB<python@mrabarnett.plus.com> wrote:
Ben Finney wrote:
Jim Jewett <jimjjewett@gmail.com> writes:
On Fri, Jun 19, 2009 at 3:39 AM, Lie Ryan<lie.1296@gmail.com> wrote:
res = [x**x as F for x in nums if F < 100] This, I have wanted. You have it:
res = [f for f in (x**x for x in nums) if f < 100]
In addition to the fact that this works now in existing Python, I find it clearer than the above syntax you say you want.
How about:
res = [F for x in nums with x**x as F if F < 100]
:-)
That toggles the first part of the comprehensions to be or not be an expression, depending on if there is a with clause later. You could miss this when you read it, and it opens the door to doing more strange things, like:
res = [F/2 for x in nums with x**x as F if F < 100]
This is basically a strangely syntaxed nested loop
I don't know what you mean.
def F(m, x): print m, x return x
[foo("value", x) for x in range(5) if foo("test", x) % 2] test 0 test 1 value 1 test 2 test 3 value 3 test 4 [1, 3]
The test is done first, so it's equivalent to:
results = [] for x in range(5): if foo("test", x) % 2: results.append(foo("value", x))
test 0 test 1 value 1 test 2 test 3 value 3 test 4 That means that: res = [x**x for x in nums if x**x < 100] is equivalent to: res = [] for x in nums : if x**x < 100: res.append(x**x) My suggestions turns: res = [] for x in nums : F = x**x # <== temporary variable if F < 100: res.append(F) into: res = [F for x in nums with x**x as F if F < 100] ^^^^^^^^^^^^^^ temporary variable