print is not a function

[Bengt Richter]

On Wed, 08 Oct 2003 12:27:06 GMT, Alex Martelli <aleax at aleax.it> wrote:
[...]
>
>Right: as I said, sys.stdout.write('%s\n'%x) is in fact
>the equivalent, so the newline and stringification are
>trivial issues, easily covered.  If you want to avoid
>a separate import statement at all costs, well, when
>there's a will there's a way -- you CAN shoehorn it all
>into a single longish expression...:
>
>    __import__('sys').stdout.write('%s\n' % x)
>
>whether one would WANT that, of course, is another
>issue;-).

Plus, the side effect to sys.modules will still happen, e.g.,:
 >>> import sys
 >>> 'math' in sys.modules
 False
 >>> twopi = __import__('math').pi*2.0
 >>> twopi
 6.2831853071795862
 >>> 'math' in sys.modules
 True

Anyway, with a little rearrangement, he could have his prt with most of the work built in once:

 >>> prt = (lambda w,x: w('%s\n'%x)).__get__(__import__('sys').stdout.write)
 >>> prt('Hello');prt('Next line')
 Hello
 Next line

or a version for selected expression item side effect output:
 >>> prt = (lambda w,x: w('%s\n'%x) or x).__get__(__import__('sys').stdout.write)
 >>> prt('Hello'),prt('Next line')
 Hello
 Next line
 ('Hello', 'Next line')
 >>> print 'expr value = %r' % (2*prt(3)*4,)
 3
 expr value = 24

Hm, if that were conditional, it could have debug print use...

 >>> prt = (lambda w,x,p=lambda x:False: p(x) and w('<%s>'%x) and 0 or x).__get__(__import__('sys
 ').stdout.write)
 >>>
 >>> pcond = lambda x: x in (2,5,11,17)
 >>>
 >>> for i in range(21): print prt(i,pcond),
 ...
 0 1<2>2 3 4<5>5 6 7 8 9 10<11>11 12 13 14 15 16<17>17 18 19 20

This is getting silly with the lambdas though,

 >>> class Prt(object):
 ...     wrso = __import__('sys').stdout.write
 ...     def __init__(self, pcond=lambda x:False, fmt='%s\n'):
 ...         self.pcond=pcond; self.fmt=fmt
 ...     def __call__(self, x):
 ...         if self.pcond(x): self.wrso(self.fmt%x)
 ...         return x
 ...
 >>> prt = Prt()
 >>> for i in range(21): print prt(i),
 ...
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 >>> prt = Prt(pcond, '<!--\n%r discovered\n-->')
 >>> for i in range(21): print prt(i),
 ...
 0 1<!--
 2 discovered
 -->2 3 4<!--
 5 discovered
 -->5 6 7 8 9 10<!--
 11 discovered
 -->11 12 13 14 15 16<!--
 17 discovered
 -->17 18 19 20

(BTW, in my other post I forgot to take into account that the OP's list of things
to print might not all be string items).

(Not really replying to your post, Alex, just ramblings triggered by it ;-)

Regards,
Bengt Richter