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from hamcrest.core.base_matcher import BaseMatcher 
from hamcrest.core.helpers.wrap_matcher import wrap_matcher 
 
__author__ = "Jon Reid" 
__copyright__ = "Copyright 2011 hamcrest.org" 
__license__ = "BSD, see License.txt" 
 
 
class HasString(BaseMatcher): 
 
    def __init__(self, str_matcher): 
        self.str_matcher = str_matcher 
 
    def _matches(self, item): 
        return self.str_matcher.matches(str(item)) 
 
    def describe_to(self, description): 
        description.append_text('an object with str ')          \ 
                    .append_description_of(self.str_matcher) 
 
 
def has_string(match): 
    """Matches if ``str(item)`` satisfies a given matcher. 
 
    :param match: The matcher to satisfy, or an expected value for 
        :py:func:`~hamcrest.core.core.isequal.equal_to` matching. 
 
    This matcher invokes the :py:func:`str` function on the evaluated object to 
    get its length, passing the result to a given matcher for evaluation. If 
    the ``match`` argument is not a matcher, it is implicitly wrapped in an 
    :py:func:`~hamcrest.core.core.isequal.equal_to` matcher to check for 
    equality. 
 
    Examples:: 
 
        has_string(starts_with('foo')) 
        has_string('bar') 
 
    """ 
    return HasString(wrap_matcher(match))