Created
February 26, 2015 03:43
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python 2 sorting
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def default_3way_compare(v, w): # Yes, this is how Python 2 sorted things :) | |
if type(v) is type(w): | |
return -1 if id(v) < id(w) else (1 if id(v) > id(w) else 0) | |
if v is None: | |
return -1 | |
if w is None: | |
return 1 | |
if isinstance(v, (int, float)): | |
vname = '' | |
else: | |
vname = type(v).__name__ | |
if isinstance(w, (int, float)): | |
wname = '' | |
else: | |
wname = type(w).__name__ | |
if vname < wname: | |
return -1 | |
if vname > wname: | |
return 1 | |
return -1 if id(type(v)) < id(type(w)) else 1 | |
def py2key(func=None): # based on cmp_to_key | |
class K(object): | |
__slots__ = ['obj'] | |
__hash__ = None | |
def __init__(self, obj): | |
self.obj = func(obj) if func else obj | |
def __lt__(self, other): | |
try: | |
return self.obj < other.obj | |
except TypeError: | |
return default_3way_compare(self.obj, other.obj) < 0 | |
def __gt__(self, other): | |
try: | |
return self.obj > other.obj | |
except TypeError: | |
return default_3way_compare(self.obj, other.obj) > 0 | |
def __eq__(self, other): | |
try: | |
return self.obj == other.obj | |
except TypeError: | |
return default_3way_compare(self.obj, other.obj) == 0 | |
def __le__(self, other): | |
try: | |
return self.obj <= other.obj | |
except TypeError: | |
return default_3way_compare(self.obj, other.obj) <= 0 | |
def __ge__(self, other): | |
try: | |
return self.obj >= other.obj | |
except TypeError: | |
return default_3way_compare(self.obj, other.obj) >= 0 | |
return K |
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