This post originated from an RSS feed registered with Python Buzz by Dmitry Dvoinikov. Original Post: Approaching Python 3000: string formatting Feed Title: Things That Require Further Thinking Feed URL: http://feeds.feedburner.com/ThingsThatRequireFurtherThinking Feed Description: Once your species has evolved language, and you have learned language, [...] and you have something to say, [...] it doesn't take much time, energy and effort to say it. The hard part of course is having something interesting to say. -- Geoffrey Miller Latest Python Buzz Posts Latest Python Buzz Posts by Dmitry Dvoinikov Latest Posts From Things That Require Further Thinking

"{0}, {1}".format("A", 10) == "A, 10"
"{n} = {v}".format(n = "N", v = "V") == "N = V"

"{0:03d}".format(10) == "010"
"<{S:>5s}>".format(S = "foo") == "<  foo>"
"<{S:<5s}>".format(S = "foo") == "<foo  >"

d = dict(foo = 1, bar = "a")
"{0[foo]}, {0[bar]}".format(d) == "1, a"
"{0.__class__.__name__}".format(d) == "dict"

d = dict(value = 10, format = "03d")
"{0[value]:{0[format]}}".format(d) == "010"

d = dict(data = {"a": "A", "b": "B"}, key = "a")
"{0[data][{0[key]}]}".format(d)

class Foo():
def __format__(self, format):
    from re import match
    assert match("[0-9]+s", format)
    return "x" * int(format[:-1])
foo = Foo()

"{0:3s}".format(foo) == "xxx"
"{0:10s}".format(foo) == "xxxxxxxxxx"