def pairwise(iterable):
"s -> (s0,s1), (s1,s2), (s2,s3), ..."
split1, split2 = itertools.tee(iterable)
a, b = itertools.tee(split1)
test1, test2 = itertools.tee(split2)
next(b, None)
if next(test1, None) is None:
ret = py23_zip(a, b) # Returns empty list
elif next(test2, None) is not None and next(test2, None) is None:
ret = py23_zip(a, [None]) # Return at least one value
else:
ret = py23_zip(a, b)
del test1, test2, split2
return ret
def _py3_safe(parsed_list, use_locale, check):
"""Insert '' between two numbers."""
length = len(parsed_list)
if length < 2:
return parsed_list
else:
new_list = [parsed_list[0]]
nl_append = new_list.append
for before, after in py23_zip(islice(parsed_list, 0, length - 1),
islice(parsed_list, 1, None)):
if check(before, num_only=True) and check(after, num_only=True):
nl_append(null_string if use_locale else '')
nl_append(after)
return new_list
def _py3_safe(parsed_list, use_locale, check):
"""Insert '' between two numbers."""
length = len(parsed_list)
if length < 2:
return parsed_list
else:
new_list = [parsed_list[0]]
nl_append = new_list.append
for before, after in py23_zip(islice(parsed_list, 0, length-1),
islice(parsed_list, 1, None)):
if check(before, num_only=True) and check(after, num_only=True):
nl_append(null_string if use_locale else '')
nl_append(after)
return new_list
