Hi David
I see where you are coming from. I find it helps to think of sep.join as a
special case. Here's a more general join, with sep.join equivalent to
genjoin(sep, '', '').
def genjoin(sep, left, right):
def fn(items):
return left + sep.join(items) + right
return fn
Here's how it works
genjoin('', '', '')('0123') == '0123'
genjoin(',', '', '')('0123') == '0,1,2,3'
genjoin(',', '[', ']')('0123') == '[0,1,2,3]'
All of these examples of genjoin can be thought of as string
comprehensions. But they don't fit into your pattern for a string
comprehension literal.
By the way, one might want something even more general. Sometimes one wants
a fn such that
fn('') == '[]'
fn('0') == '[0,]'
fn('01') == '[0,1,]'
which is again a string comprehension.
I hope this helps.
--
Jonathan
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