文件操作 - is_empty.py

文件: /usr/lib/python3/dist-packages/hamcrest/library/collection/is_empty.py

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from typing import Optional, Sized

from hamcrest.core.base_matcher import BaseMatcher
from hamcrest.core.description import Description
from hamcrest.core.matcher import Matcher

__author__ = "Chris Rose"
__copyright__ = "Copyright 2012 hamcrest.org"
__license__ = "BSD, see License.txt"

class IsEmpty(BaseMatcher[Sized]):
    def matches(self, item: Sized, mismatch_description: Optional[Description] = None) -> bool:
        try:
            if len(item) == 0:
                return True

if mismatch_description:
                mismatch_description.append_text("has %d item(s)" % len(item))

except TypeError:
            if mismatch_description:
                mismatch_description.append_text("does not support length")

return False

def describe_to(self, description: Description) -> None:
        description.append_text("an empty collection")

def empty() -> Matcher[Sized]:
    """
    This matcher matches any collection-like object that responds to the
    __len__ method, and has a length of 0.
    """
    return IsEmpty()

文件操作 - is_empty.py

文件: /usr/lib/python3/dist-packages/hamcrest/library/collection/is_empty.py

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