/usr/lib/python3/dist-packages/pyutilib/misc/cross.py is in python3-pyutilib 5.3.5-1.
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#
# PyUtilib: A Python utility library.
# Copyright (c) 2008 Sandia Corporation.
# This software is distributed under the BSD License.
# Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
# the U.S. Government retains certain rights in this software.
# _________________________________________________________________________
import sys
from pyutilib.misc import misc
if sys.version_info >= (3,0):
xrange = range
def _cross_exec(set_tuple):
"""
Function used by cross() to generate the cross-product of a tuple
"""
resulting_set = []
if len(set_tuple) == 1:
for val in set_tuple[0]:
resulting_set.append( [val] )
else:
tmp_set = _cross_exec(set_tuple[1:])
for val in set_tuple[0]:
for item in tmp_set:
#print val, item
resulting_set.append( [val] + item )
return resulting_set
def cross(set_tuple):
"""
Returns the cross-product of a tuple of values
"""
result_set = []
tmp_set = _cross_exec(set_tuple)
for val in tmp_set:
result_set.append( tuple(val) )
return result_set
#def tmp_cross(*args):
# ans = [[]]
# for arg in args:
# ans = [x+[y] for x in ans for y in arg]
# return ans
if sys.version_info < (3,0):
def cross_iter(*sets):
"""
An iterator function that generates a cross product of
a set.
Derived from code developed by Steven Taschuk
"""
wheels = map(iter, sets) # wheels like in an odometer
digits = [it.next() for it in wheels]
while True:
yield tuple(digits[:])
for i in xrange(len(digits)-1, -1, -1):
try:
digits[i] = wheels[i].next()
break
except StopIteration:
wheels[i] = iter(sets[i])
digits[i] = wheels[i].next()
else:
break
def flattened_cross_iter(*sets):
"""
An iterator function that generates a cross product of
a set, and flattens it.
"""
wheels = map(iter, sets) # wheels like in an odometer
digits = [it.next() for it in wheels]
ndigits = len(digits)
while True:
yield misc.flatten_tuple(tuple(digits[:]))
for i in xrange(ndigits-1, -1, -1):
try:
digits[i] = wheels[i].next()
break
except StopIteration:
wheels[i] = iter(sets[i])
digits[i] = wheels[i].next()
else:
break
else:
def cross_iter(*sets):
"""
An iterator function that generates a cross product of
a set.
Derived from code developed by Steven Taschuk
"""
wheels = list(map(iter, sets)) # wheels like in an odometer
digits = [next(it) for it in wheels]
while True:
yield tuple(digits[:])
for i in range(len(digits)-1, -1, -1):
try:
digits[i] = next(wheels[i])
break
except StopIteration:
wheels[i] = iter(sets[i])
digits[i] = next(wheels[i])
else:
break
def flattened_cross_iter(*sets):
"""
An iterator function that generates a cross product of
a set, and flattens it.
"""
wheels = list(map(iter, sets)) # wheels like in an odometer
digits = [next(it) for it in wheels]
ndigits = len(digits)
while True:
yield misc.flatten_tuple(tuple(digits[:]))
for i in range(ndigits-1, -1, -1):
try:
digits[i] = next(wheels[i])
break
except StopIteration:
wheels[i] = iter(sets[i])
digits[i] = next(wheels[i])
else:
break
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