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from numerictypes import character, string, unicode_, obj2dtype, integer
from numeric import ndarray, multiter, empty
# special sub-class for character arrays (string and unicode_)
# This adds equality testing and methods of str and unicode types
# which operate on an element-by-element basis
class ndchararray(ndarray):
def __new__(subtype, shape, itemlen=1, unicode=False, buffer=None,
offset=0, strides=None, swap=0, fortran=0):
if unicode:
dtype = 'U%d' % itemlen
else:
dtype = 'U%d' % itemlen
swap = 0
if buffer is None:
self = ndarray.__new__(subtype, shape, dtype, fortran=fortran)
else:
self = ndarray.__new__(subtype, shape, dtype, buffer=buffer,
offset=offset, strides=strides,
swap=swap, fortran=fortran)
return self
def __reduce__(self):
pass
# these should be moved to C
def __eq__(self, other):
b = multiter(self, other)
result = empty(b.shape, dtype=bool)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] == val[1])
return result
def __ne__(self, other):
b = multiter(self, other)
result = empty(b.shape, dtype=bool)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] != val[1])
return result
def __ge__(self, other):
b = multiter(self, other)
result = empty(b.shape, dtype=bool)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] >= val[1])
return result
def __le__(self, other):
b = multiter(self, other)
result = empty(b.shape, dtype=bool)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] <= val[1])
return result
def __gt__(self, other):
b = multiter(self, other)
result = empty(b.shape, dtype=bool)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] > val[1])
return result
def __lt__(self, other):
b = multiter(self, other)
result = empty(b.shape, dtype=bool)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] < val[1])
return result
def __add__(self, other):
b = multiter(self, other)
arr = b.iters[1].base
outitem = self.itemsize + arr.itemsize
dtype = self.dtypestr[1:2] + str(outitem)
result = empty(b.shape, dtype=dtype)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] + val[1])
return result
def __radd__(self, other):
b = multiter(other, self)
outitem = b.iters[0].base.itemsize + \
b.iters[1].base.itemsize
dtype = self.dtypestr[1:2] + str(outitem)
result = empty(b.shape, dtype=dtype)
res = result.flat
for k, val in enumerate(b):
res[k] = (val[0] + val[1])
return result
def __mul__(self, other):
b = multiter(self, other)
arr = b.iters[1].base
if not issubclass(arr.dtype, integer):
raise ValueError, "Can only multiply by integers"
outitem = b.iters[0].base.itemsize * arr.max()
dtype = self.dtypestr[1:2] + str(outitem)
result = empty(b.shape, dtype=dtype)
res = result.flat
for k, val in enumerate(b):
res[k] = val[0]*val[1]
return result
def __rmul__(self, other):
b = multiter(self, other)
arr = b.iters[1].base
if not issubclass(arr.dtype, integer):
raise ValueError, "Can only multiply by integers"
outitem = b.iters[0].base.itemsize * arr.max()
dtype = self.dtypestr[1:2] + str(outitem)
result = empty(b.shape, dtype=dtype)
res = result.flat
for k, val in enumerate(b):
res[k] = val[0]*val[1]
return result
def __mod__(self, other):
return NotImplemented
def __rmod__(self, other):
return NotImplemented
def capitalize(self):
pass
def center(self):
pass
def count(self):
pass
def decode(self):
pass
def encode(self):
pass
def endswith(self):
pass
def expandtabs(self):
pass
def find(self):
pass
def index(self):
pass
def isalnum(self):
pass
def isalpha(self):
pass
def isdigit(self):
pass
def islower(self):
pass
def isspace(self):
pass
def istitle(self):
pass
def isupper(self):
pass
def join(self):
pass
def ljust(self):
pass
def lower(self):
pass
def lstrip(self):
pass
def replace(self):
pass
def rfind(self):
pass
def rindex(self):
pass
def rjust(self):
pass
def rsplit(self):
pass
def rstrip(self):
pass
def split(self):
pass
def splitlines(self):
pass
def startswith(self):
pass
def strip(self):
pass
def swapcase(self):
pass
def title(self):
pass
def translate(self):
pass
def upper(self):
pass
def zfill(self):
pass
def chararray(obj, itemlen=7, copy=True, unicode=False, fortran=False):
if isinstance(obj, charndarray):
if copy or (itemlen != obj.itemlen) \
or (not unicode and obj.dtype == unicode_) \
or (unicode and obj.dtype == string):
return obj.astype(obj.dtypestr[1:])
else:
return obj
if isinstance(obj, ndarray) and (obj.dtype in [unicode_, string]):
copied = 0
if unicode:
dtype = 'U%d' % obj.itemlen
if obj.dtype == string:
obj = obj.astype(dtype)
copied = 1
else:
dtype = 'S%d' % obj.itemlen
if obj.dtype == unicode_:
obj = obj.astype(dtype)
copied = 1
if copy and not copied:
obj = obj.copy()
return ndarray.__new__(chararray, obj.shape)
if unicode:
dtype = "U%d" % itemlen
else:
dtype = "S%d" % itemlen
val = asarray(obj).astype(dtype)
return ndchararray(val.shape, itemlen, unicode, buffer=val,
strides=val.strides, fortran=fortran)
def aschararray(obj):
return chararray(obj, copy=False)
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