Re: [Jython-users] Supporting + on Java objects

[Kevin B. <kb...@ca...>]

I wrote:

 > hairier than you want: %(Template( {"one":1, "two":4, "four":16, "4":16}
 > ).format( "Square of four is %(four)s, but the digit 4 is %(4)s" ))s
 > """

Woops!  Just realized I included code using my original Template class name & format method.
Gotta remember to run all examples in a new interpreter before posting.  :-)

This example will work better:

import operator

class Formatter:
     def __init__( self, locals=None ):
         self.locals = locals or globals()

     def __getitem__( self, name ):
         return eval( name, self.locals )

asdf=10

template = """asdf=%(asdf)s
simple expression=%(20+30)s
complex expression=%(reduce(operator.add, range( 10 )))s
hairier than you want: %("Square of four is %(four)s, but the digit 4 is %(4)s" % Formatter( {"one":1, "two":4, "four":16, "4":16} ))s
"""

print template % Formatter()

Output:

 >>> ## working on region in file d:/TEMP/python-318cSW...
asdf=10
simple expression=50
complex expression=45
hairier than you want: Square of four is 16, but the digit 4 is 4

 >>>

(I should also point out that eval may not be blindingly fast, and there
are security concerns in evaluating any user-provided expressions...)

kb