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test_string.py
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558 lines (483 loc) · 22.9 KB
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import unittest
import string
from string import Template
import types
from test.support import cpython_only
from test.support.import_helper import ensure_lazy_imports
class LazyImportTest(unittest.TestCase):
@cpython_only
def test_lazy_import(self):
ensure_lazy_imports("base64", {"re", "collections"})
class ModuleTest(unittest.TestCase):
def test_attrs(self):
# While the exact order of the items in these attributes is not
# technically part of the "language spec", in practice there is almost
# certainly user code that depends on the order, so de-facto it *is*
# part of the spec.
self.assertEqual(string.whitespace, ' \t\n\r\x0b\x0c')
self.assertEqual(string.ascii_lowercase, 'abcdefghijklmnopqrstuvwxyz')
self.assertEqual(string.ascii_uppercase, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ')
self.assertEqual(string.ascii_letters, string.ascii_lowercase + string.ascii_uppercase)
self.assertEqual(string.digits, '0123456789')
self.assertEqual(string.hexdigits, string.digits + 'abcdefABCDEF')
self.assertEqual(string.octdigits, '01234567')
self.assertEqual(string.punctuation, '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~')
self.assertEqual(string.printable, string.digits + string.ascii_lowercase + string.ascii_uppercase + string.punctuation + string.whitespace)
def test_capwords(self):
self.assertEqual(string.capwords('abc def ghi'), 'Abc Def Ghi')
self.assertEqual(string.capwords('abc\tdef\nghi'), 'Abc Def Ghi')
self.assertEqual(string.capwords('abc\t def \nghi'), 'Abc Def Ghi')
self.assertEqual(string.capwords('ABC DEF GHI'), 'Abc Def Ghi')
self.assertEqual(string.capwords('ABC-DEF-GHI', '-'), 'Abc-Def-Ghi')
self.assertEqual(string.capwords('ABC-def DEF-ghi GHI'), 'Abc-def Def-ghi Ghi')
self.assertEqual(string.capwords(' aBc DeF '), 'Abc Def')
self.assertEqual(string.capwords('\taBc\tDeF\t'), 'Abc Def')
self.assertEqual(string.capwords('\taBc\tDeF\t', '\t'), '\tAbc\tDef\t')
def test_basic_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.assertRaises(TypeError, fmt.format)
self.assertRaises(TypeError, string.Formatter.format)
def test_format_keyword_arguments(self):
fmt = string.Formatter()
self.assertEqual(fmt.format("-{arg}-", arg='test'), '-test-')
self.assertRaises(KeyError, fmt.format, "-{arg}-")
self.assertEqual(fmt.format("-{self}-", self='test'), '-test-')
self.assertRaises(KeyError, fmt.format, "-{self}-")
self.assertEqual(fmt.format("-{format_string}-", format_string='test'),
'-test-')
self.assertRaises(KeyError, fmt.format, "-{format_string}-")
with self.assertRaisesRegex(TypeError, "format_string"):
fmt.format(format_string="-{arg}-", arg='test')
def test_auto_numbering(self):
fmt = string.Formatter()
self.assertEqual(fmt.format('foo{}{}', 'bar', 6),
'foo{}{}'.format('bar', 6))
self.assertEqual(fmt.format('foo{1}{num}{1}', None, 'bar', num=6),
'foo{1}{num}{1}'.format(None, 'bar', num=6))
self.assertEqual(fmt.format('{:^{}}', 'bar', 6),
'{:^{}}'.format('bar', 6))
self.assertEqual(fmt.format('{:^{}} {}', 'bar', 6, 'X'),
'{:^{}} {}'.format('bar', 6, 'X'))
self.assertEqual(fmt.format('{:^{pad}}{}', 'foo', 'bar', pad=6),
'{:^{pad}}{}'.format('foo', 'bar', pad=6))
with self.assertRaises(ValueError):
fmt.format('foo{1}{}', 'bar', 6)
with self.assertRaises(ValueError):
fmt.format('foo{}{1}', 'bar', 6)
def test_conversion_specifiers(self):
fmt = string.Formatter()
self.assertEqual(fmt.format("-{arg!r}-", arg='test'), "-'test'-")
self.assertEqual(fmt.format("{0!s}", 'test'), 'test')
self.assertRaises(ValueError, fmt.format, "{0!h}", 'test')
# issue13579
self.assertEqual(fmt.format("{0!a}", 42), '42')
self.assertEqual(fmt.format("{0!a}", string.ascii_letters),
"'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'")
self.assertEqual(fmt.format("{0!a}", chr(255)), "'\\xff'")
self.assertEqual(fmt.format("{0!a}", chr(256)), "'\\u0100'")
def test_name_lookup(self):
fmt = string.Formatter()
class AnyAttr:
def __getattr__(self, attr):
return attr
x = AnyAttr()
self.assertEqual(fmt.format("{0.lumber}{0.jack}", x), 'lumberjack')
with self.assertRaises(AttributeError):
fmt.format("{0.lumber}{0.jack}", '')
def test_index_lookup(self):
fmt = string.Formatter()
lookup = ["eggs", "and", "spam"]
self.assertEqual(fmt.format("{0[2]}{0[0]}", lookup), 'spameggs')
with self.assertRaises(IndexError):
fmt.format("{0[2]}{0[0]}", [])
with self.assertRaises(KeyError):
fmt.format("{0[2]}{0[0]}", {})
def test_auto_numbering_lookup(self):
fmt = string.Formatter()
namespace = types.SimpleNamespace(foo=types.SimpleNamespace(bar='baz'))
widths = [None, types.SimpleNamespace(qux=4)]
self.assertEqual(
fmt.format("{.foo.bar:{[1].qux}}", namespace, widths), 'baz ')
def test_auto_numbering_reenterability(self):
class ReenteringFormatter(string.Formatter):
def format_field(self, value, format_spec):
if format_spec.isdigit() and int(format_spec) > 0:
return self.format('{:{}}!', value, int(format_spec) - 1)
else:
return super().format_field(value, format_spec)
fmt = ReenteringFormatter()
x = types.SimpleNamespace(a='X')
self.assertEqual(fmt.format('{.a:{}}', x, 3), 'X!!!')
def test_override_get_value(self):
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!')
def test_override_format_field(self):
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*')
def test_override_convert_field(self):
class XFormatter(string.Formatter):
def convert_field(self, value, conversion):
if conversion == 'x':
return None
return super().convert_field(value, conversion)
fmt = XFormatter()
self.assertEqual(fmt.format("{0!r}:{0!x}", 'foo', 'foo'), "'foo':None")
def test_override_parse(self):
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 *')
def test_check_unused_args(self):
class CheckAllUsedFormatter(string.Formatter):
def check_unused_args(self, used_args, args, kwargs):
# Track which arguments actually 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_vformat_recursion_limit(self):
fmt = string.Formatter()
args = ()
kwargs = dict(i=100)
with self.assertRaises(ValueError) as err:
fmt._vformat("{i}", args, kwargs, set(), -1)
self.assertIn("recursion", str(err.exception))
# Template tests (formerly housed in test_pep292.py)
class Bag:
pass
class Mapping:
def __getitem__(self, name):
obj = self
for part in name.split('.'):
try:
obj = getattr(obj, part)
except AttributeError:
raise KeyError(name)
return obj
class TestTemplate(unittest.TestCase):
def test_regular_templates(self):
s = Template('$who likes to eat a bag of $what worth $$100')
self.assertEqual(s.substitute(dict(who='tim', what='ham')),
'tim likes to eat a bag of ham worth $100')
self.assertRaises(KeyError, s.substitute, dict(who='tim'))
self.assertRaises(TypeError, Template.substitute)
def test_regular_templates_with_braces(self):
s = Template('$who likes ${what} for ${meal}')
d = dict(who='tim', what='ham', meal='dinner')
self.assertEqual(s.substitute(d), 'tim likes ham for dinner')
self.assertRaises(KeyError, s.substitute,
dict(who='tim', what='ham'))
def test_regular_templates_with_upper_case(self):
s = Template('$WHO likes ${WHAT} for ${MEAL}')
d = dict(WHO='tim', WHAT='ham', MEAL='dinner')
self.assertEqual(s.substitute(d), 'tim likes ham for dinner')
def test_regular_templates_with_non_letters(self):
s = Template('$_wh0_ likes ${_w_h_a_t_} for ${mea1}')
d = dict(_wh0_='tim', _w_h_a_t_='ham', mea1='dinner')
self.assertEqual(s.substitute(d), 'tim likes ham for dinner')
def test_escapes(self):
eq = self.assertEqual
s = Template('$who likes to eat a bag of $$what worth $$100')
eq(s.substitute(dict(who='tim', what='ham')),
'tim likes to eat a bag of $what worth $100')
s = Template('$who likes $$')
eq(s.substitute(dict(who='tim', what='ham')), 'tim likes $')
def test_percents(self):
eq = self.assertEqual
s = Template('%(foo)s $foo ${foo}')
d = dict(foo='baz')
eq(s.substitute(d), '%(foo)s baz baz')
eq(s.safe_substitute(d), '%(foo)s baz baz')
def test_stringification(self):
eq = self.assertEqual
s = Template('tim has eaten $count bags of ham today')
d = dict(count=7)
eq(s.substitute(d), 'tim has eaten 7 bags of ham today')
eq(s.safe_substitute(d), 'tim has eaten 7 bags of ham today')
s = Template('tim has eaten ${count} bags of ham today')
eq(s.substitute(d), 'tim has eaten 7 bags of ham today')
def test_tupleargs(self):
eq = self.assertEqual
s = Template('$who ate ${meal}')
d = dict(who=('tim', 'fred'), meal=('ham', 'kung pao'))
eq(s.substitute(d), "('tim', 'fred') ate ('ham', 'kung pao')")
eq(s.safe_substitute(d), "('tim', 'fred') ate ('ham', 'kung pao')")
def test_SafeTemplate(self):
eq = self.assertEqual
s = Template('$who likes ${what} for ${meal}')
eq(s.safe_substitute(dict(who='tim')), 'tim likes ${what} for ${meal}')
eq(s.safe_substitute(dict(what='ham')), '$who likes ham for ${meal}')
eq(s.safe_substitute(dict(what='ham', meal='dinner')),
'$who likes ham for dinner')
eq(s.safe_substitute(dict(who='tim', what='ham')),
'tim likes ham for ${meal}')
eq(s.safe_substitute(dict(who='tim', what='ham', meal='dinner')),
'tim likes ham for dinner')
def test_invalid_placeholders(self):
raises = self.assertRaises
s = Template('$who likes $')
raises(ValueError, s.substitute, dict(who='tim'))
s = Template('$who likes ${what)')
raises(ValueError, s.substitute, dict(who='tim'))
s = Template('$who likes $100')
raises(ValueError, s.substitute, dict(who='tim'))
# Template.idpattern should match to only ASCII characters.
# https://bugs.python.org/issue31672
s = Template("$who likes $\u0131") # (DOTLESS I)
raises(ValueError, s.substitute, dict(who='tim'))
s = Template("$who likes $\u0130") # (LATIN CAPITAL LETTER I WITH DOT ABOVE)
raises(ValueError, s.substitute, dict(who='tim'))
def test_idpattern_override(self):
class PathPattern(Template):
idpattern = r'[_a-z][._a-z0-9]*'
m = Mapping()
m.bag = Bag()
m.bag.foo = Bag()
m.bag.foo.who = 'tim'
m.bag.what = 'ham'
s = PathPattern('$bag.foo.who likes to eat a bag of $bag.what')
self.assertEqual(s.substitute(m), 'tim likes to eat a bag of ham')
def test_flags_override(self):
class MyPattern(Template):
flags = 0
s = MyPattern('$wHO likes ${WHAT} for ${meal}')
d = dict(wHO='tim', WHAT='ham', meal='dinner', w='fred')
self.assertRaises(ValueError, s.substitute, d)
self.assertEqual(s.safe_substitute(d), 'fredHO likes ${WHAT} for dinner')
def test_idpattern_override_inside_outside(self):
# bpo-1198569: Allow the regexp inside and outside braces to be
# different when deriving from Template.
class MyPattern(Template):
idpattern = r'[a-z]+'
braceidpattern = r'[A-Z]+'
flags = 0
m = dict(foo='foo', BAR='BAR')
s = MyPattern('$foo ${BAR}')
self.assertEqual(s.substitute(m), 'foo BAR')
def test_idpattern_override_inside_outside_invalid_unbraced(self):
# bpo-1198569: Allow the regexp inside and outside braces to be
# different when deriving from Template.
class MyPattern(Template):
idpattern = r'[a-z]+'
braceidpattern = r'[A-Z]+'
flags = 0
m = dict(foo='foo', BAR='BAR')
s = MyPattern('$FOO')
self.assertRaises(ValueError, s.substitute, m)
s = MyPattern('${bar}')
self.assertRaises(ValueError, s.substitute, m)
def test_pattern_override(self):
class MyPattern(Template):
pattern = r"""
(?P<escaped>@{2}) |
@(?P<named>[_a-z][._a-z0-9]*) |
@{(?P<braced>[_a-z][._a-z0-9]*)} |
(?P<invalid>@)
"""
m = Mapping()
m.bag = Bag()
m.bag.foo = Bag()
m.bag.foo.who = 'tim'
m.bag.what = 'ham'
s = MyPattern('@bag.foo.who likes to eat a bag of @bag.what')
self.assertEqual(s.substitute(m), 'tim likes to eat a bag of ham')
class BadPattern(Template):
pattern = r"""
(?P<badname>.*) |
(?P<escaped>@{2}) |
@(?P<named>[_a-z][._a-z0-9]*) |
@{(?P<braced>[_a-z][._a-z0-9]*)} |
(?P<invalid>@) |
"""
s = BadPattern('@bag.foo.who likes to eat a bag of @bag.what')
self.assertRaises(ValueError, s.substitute, {})
self.assertRaises(ValueError, s.safe_substitute, {})
def test_braced_override(self):
class MyTemplate(Template):
pattern = r"""
\$(?:
(?P<escaped>$) |
(?P<named>[_a-z][_a-z0-9]*) |
@@(?P<braced>[_a-z][_a-z0-9]*)@@ |
(?P<invalid>) |
)
"""
tmpl = 'PyCon in $@@location@@'
t = MyTemplate(tmpl)
self.assertRaises(KeyError, t.substitute, {})
val = t.substitute({'location': 'Cleveland'})
self.assertEqual(val, 'PyCon in Cleveland')
def test_braced_override_safe(self):
class MyTemplate(Template):
pattern = r"""
\$(?:
(?P<escaped>$) |
(?P<named>[_a-z][_a-z0-9]*) |
@@(?P<braced>[_a-z][_a-z0-9]*)@@ |
(?P<invalid>) |
)
"""
tmpl = 'PyCon in $@@location@@'
t = MyTemplate(tmpl)
self.assertEqual(t.safe_substitute(), tmpl)
val = t.safe_substitute({'location': 'Cleveland'})
self.assertEqual(val, 'PyCon in Cleveland')
def test_invalid_with_no_lines(self):
# The error formatting for invalid templates
# has a special case for no data that the default
# pattern can't trigger (always has at least '$')
# So we craft a pattern that is always invalid
# with no leading data.
class MyTemplate(Template):
pattern = r"""
(?P<invalid>) |
unreachable(
(?P<named>) |
(?P<braced>) |
(?P<escaped>)
)
"""
s = MyTemplate('')
with self.assertRaises(ValueError) as err:
s.substitute({})
self.assertIn('line 1, col 1', str(err.exception))
def test_unicode_values(self):
s = Template('$who likes $what')
d = dict(who='t\xffm', what='f\xfe\fed')
self.assertEqual(s.substitute(d), 't\xffm likes f\xfe\x0ced')
def test_keyword_arguments(self):
eq = self.assertEqual
s = Template('$who likes $what')
eq(s.substitute(who='tim', what='ham'), 'tim likes ham')
eq(s.substitute(dict(who='tim'), what='ham'), 'tim likes ham')
eq(s.substitute(dict(who='fred', what='kung pao'),
who='tim', what='ham'),
'tim likes ham')
s = Template('the mapping is $mapping')
eq(s.substitute(dict(foo='none'), mapping='bozo'),
'the mapping is bozo')
eq(s.substitute(dict(mapping='one'), mapping='two'),
'the mapping is two')
s = Template('the self is $self')
eq(s.substitute(self='bozo'), 'the self is bozo')
def test_keyword_arguments_safe(self):
eq = self.assertEqual
raises = self.assertRaises
s = Template('$who likes $what')
eq(s.safe_substitute(who='tim', what='ham'), 'tim likes ham')
eq(s.safe_substitute(dict(who='tim'), what='ham'), 'tim likes ham')
eq(s.safe_substitute(dict(who='fred', what='kung pao'),
who='tim', what='ham'),
'tim likes ham')
s = Template('the mapping is $mapping')
eq(s.safe_substitute(dict(foo='none'), mapping='bozo'),
'the mapping is bozo')
eq(s.safe_substitute(dict(mapping='one'), mapping='two'),
'the mapping is two')
d = dict(mapping='one')
raises(TypeError, s.substitute, d, {})
raises(TypeError, s.safe_substitute, d, {})
s = Template('the self is $self')
eq(s.safe_substitute(self='bozo'), 'the self is bozo')
def test_delimiter_override(self):
eq = self.assertEqual
raises = self.assertRaises
class AmpersandTemplate(Template):
delimiter = '&'
s = AmpersandTemplate('this &gift is for &{who} &&')
eq(s.substitute(gift='bud', who='you'), 'this bud is for you &')
raises(KeyError, s.substitute)
eq(s.safe_substitute(gift='bud', who='you'), 'this bud is for you &')
eq(s.safe_substitute(), 'this &gift is for &{who} &')
s = AmpersandTemplate('this &gift is for &{who} &')
raises(ValueError, s.substitute, dict(gift='bud', who='you'))
eq(s.safe_substitute(), 'this &gift is for &{who} &')
class PieDelims(Template):
delimiter = '@'
s = PieDelims('@who likes to eat a bag of @{what} worth $100')
self.assertEqual(s.substitute(dict(who='tim', what='ham')),
'tim likes to eat a bag of ham worth $100')
def test_is_valid(self):
eq = self.assertEqual
s = Template('$who likes to eat a bag of ${what} worth $$100')
self.assertTrue(s.is_valid())
s = Template('$who likes to eat a bag of ${what} worth $100')
self.assertFalse(s.is_valid())
# if the pattern has an unrecognized capture group,
# it should raise ValueError like substitute and safe_substitute do
class BadPattern(Template):
pattern = r"""
(?P<badname>.*) |
(?P<escaped>@{2}) |
@(?P<named>[_a-z][._a-z0-9]*) |
@{(?P<braced>[_a-z][._a-z0-9]*)} |
(?P<invalid>@) |
"""
s = BadPattern('@bag.foo.who likes to eat a bag of @bag.what')
self.assertRaises(ValueError, s.is_valid)
def test_get_identifiers(self):
eq = self.assertEqual
raises = self.assertRaises
s = Template('$who likes to eat a bag of ${what} worth $$100')
ids = s.get_identifiers()
eq(ids, ['who', 'what'])
# repeated identifiers only included once
s = Template('$who likes to eat a bag of ${what} worth $$100; ${who} likes to eat a bag of $what worth $$100')
ids = s.get_identifiers()
eq(ids, ['who', 'what'])
# invalid identifiers are ignored
s = Template('$who likes to eat a bag of ${what} worth $100')
ids = s.get_identifiers()
eq(ids, ['who', 'what'])
# if the pattern has an unrecognized capture group,
# it should raise ValueError like substitute and safe_substitute do
class BadPattern(Template):
pattern = r"""
(?P<badname>.*) |
(?P<escaped>@{2}) |
@(?P<named>[_a-z][._a-z0-9]*) |
@{(?P<braced>[_a-z][._a-z0-9]*)} |
(?P<invalid>@) |
"""
s = BadPattern('@bag.foo.who likes to eat a bag of @bag.what')
self.assertRaises(ValueError, s.get_identifiers)
if __name__ == '__main__':
unittest.main()