codeql/python/ql/src/Classes/EqualsOrHash.py at codeql-cli/v2.15.5 · github/codeql · GitHub

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# Incorrect: equality method defined but class contains no hash method

class Point(object):

def __init__(self, x, y):

self._x = x

self._y = y

def __repr__(self):

return 'Point(%r, %r)' % (self._x, self._y)

def __eq__(self, other):

if not isinstance(other, Point):

return False

return self._x == other._x and self._y == other._y

# Improved: equality and hash method defined (inequality method still missing)

class PointUpdated(object):

def __init__(self, x, y):

self._x = x

self._y = y

def __repr__(self):

return 'Point(%r, %r)' % (self._x, self._y)

def __eq__(self, other):

if not isinstance(other, Point):

return False

return self._x == other._x and self._y == other._y

def __hash__(self):

return hash(self._x) ^ hash(self._y)

# Improved: equality method defined and class instances made unhashable

class UnhashablePoint(object):

def __init__(self, x, y):

self._x = x

self._y = y

def __repr__(self):

return 'Point(%r, %r)' % (self._x, self._y)

def __eq__(self, other):

if not isinstance(other, Point):

return False

return self._x == other._x and self._y == other._y

#Tell the interpreter that instances of this class cannot be hashed

__hash__ = None

codeql/python/ql/src/Classes/EqualsOrHash.py at codeql-cli/v2.15.5 · github/codeql · GitHub

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