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import sys
def flatten(values):
return flat_map(lambda x: x, values)
def unique(values):
output = []
seen = set()
for value in values:
if value not in seen:
seen.add(value)
output.append(value)
return output
def flat_map(func, values):
return [
element
for value in values
for element in func(value)
]
if sys.version_info[0] == 2:
map = map
filter = filter
else:
import builtins
def map(*args, **kwargs):
return list(builtins.map(*args, **kwargs))
def filter(*args, **kwargs):
return list(builtins.filter(*args, **kwargs))
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