Lib/test/test_string.py

import unittest, string
from test import test_support


class ModuleTest(unittest.TestCase):

    def test_attrs(self):
        string.whitespace
        string.ascii_lowercase
        string.ascii_uppercase
        string.ascii_letters
        string.digits
        string.hexdigits
        string.octdigits
        string.punctuation
        string.printable

    def test_formatter(self):
        fmt = string.Formatter()
        self.assertEqual(fmt.format("foo"), "foo")

        self.assertEqual(fmt.format("foo{0}", "bar"), "foobar")
        self.assertEqual(fmt.format("foo{1}{0}-{1}", "bar", 6), "foo6bar-6")
        self.assertEqual(fmt.format("-{arg!r}-", arg='test'), "-'test'-")

        # override get_value ############################################
        class NamespaceFormatter(string.Formatter):
            def __init__(self, namespace={}):
                string.Formatter.__init__(self)
                self.namespace = namespace

            def get_value(self, key, args, kwds):
                if isinstance(key, str):
                    try:
                        # Check explicitly passed arguments first
                        return kwds[key]
                    except KeyError:
                        return self.namespace[key]
                else:
                    string.Formatter.get_value(key, args, kwds)

        fmt = NamespaceFormatter({'greeting':'hello'})
        self.assertEqual(fmt.format("{greeting}, world!"), 'hello, world!')


        # override format_field #########################################
        class CallFormatter(string.Formatter):
            def format_field(self, value, format_spec):
                return format(value(), format_spec)

        fmt = CallFormatter()
        self.assertEqual(fmt.format('*{0}*', lambda : 'result'), '*result*')


        # override convert_field ########################################
        class XFormatter(string.Formatter):
            def convert_field(self, value, conversion):
                if conversion == 'x':
                    return None
                return super(XFormatter, self).convert_field(value, conversion)

        fmt = XFormatter()
        self.assertEqual(fmt.format("{0!r}:{0!x}", 'foo', 'foo'), "'foo':None")


        # override parse ################################################
        class BarFormatter(string.Formatter):
            # returns an iterable that contains tuples of the form:
            # (literal_text, field_name, format_spec, conversion)
            def parse(self, format_string):
                for field in format_string.split('|'):
                    if field[0] == '+':
                        # it's markup
                        field_name, _, format_spec = field[1:].partition(':')
                        yield '', field_name, format_spec, None
                    else:
                        yield field, None, None, None

        fmt = BarFormatter()
        self.assertEqual(fmt.format('*|+0:^10s|*', 'foo'), '*   foo    *')

        # test all parameters used
        class CheckAllUsedFormatter(string.Formatter):
            def check_unused_args(self, used_args, args, kwargs):
                # Track which arguments actuallly got used
                unused_args = set(kwargs.keys())
                unused_args.update(range(0, len(args)))

                for arg in used_args:
                    unused_args.remove(arg)

                if unused_args:
                    raise ValueError("unused arguments")

        fmt = CheckAllUsedFormatter()
        self.assertEqual(fmt.format("{0}", 10), "10")
        self.assertEqual(fmt.format("{0}{i}", 10, i=100), "10100")
        self.assertEqual(fmt.format("{0}{i}{1}", 10, 20, i=100), "1010020")
        self.assertRaises(ValueError, fmt.format, "{0}{i}{1}", 10, 20, i=100, j=0)
        self.assertRaises(ValueError, fmt.format, "{0}", 10, 20)
        self.assertRaises(ValueError, fmt.format, "{0}", 10, 20, i=100)
        self.assertRaises(ValueError, fmt.format, "{i}", 10, 20, i=100)


    def test_maketrans(self):
        transtable = '\000\001\002\003\004\005\006\007\010\011\012\013\014\015\016\017\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037 !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`xyzdefghijklmnopqrstuvwxyz{|}~\177\200\201\202\203\204\205\206\207\210\211\212\213\214\215\216\217\220\221\222\223\224\225\226\227\230\231\232\233\234\235\236\237\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256\257\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277\300\301\302\303\304\305\306\307\310\311\312\313\314\315\316\317\320\321\322\323\324\325\326\327\330\331\332\333\334\335\336\337\340\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376\377'

        self.assertEqual(string.maketrans('abc', 'xyz'), transtable)
        self.assertRaises(ValueError, string.maketrans, 'abc', 'xyzq')

def test_main():
    test_support.run_unittest(ModuleTest)

if __name__ == "__main__":
    test_main()