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Comment by mbrubeck | Hacker News Reader

It works if you use a comma, like the comment you replied to.

Python 2.6 introduces string interpolation like Ruby/Perl. (Older versions used printf-style format strings.)

  print "x: {x}".format(x=1234)  # New in 2.6

  print "x: %d" % x              # Old

http://docs.python.org/tutorial/inputoutput.html#fancier-out...

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To be fair, that's not quite the same as perl/shell-style interpolation.

In perl, "$x" pulls the value of $x from the variable namespace. In your Py2.6 example, the "{x}" format in the string has nothing to do with a variable named x; rather it references the keyword args supplied to format.

To simulate perl's

  print "x: $x";

you would

  print "x: {x}".format(x=x)

This also works:

  >>> "X: %(x)s" % {"x":10}
  'X: 10'

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