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import enum
def coalesce(*args):
'''
Return the first non-None argument
>>> coalesce()
>>> coalesce(0, 1)
0
>>> coalesce(None, 0)
0
'''
for arg in args:
if arg is not None:
return arg
class Strip(enum.IntEnum):
NONE = 0
LEFT = 1
RIGHT = 2
BOTH = 3
def join_lines(string, strip=Strip.BOTH):
'''
Join strings together and strip whitespace in between if needed
'''
lines = []
for line in string.splitlines():
if strip & Strip.RIGHT:
line = line.rstrip()
if strip & Strip.LEFT:
line = line.lstrip()
lines.append(line)
return ''.join(lines)
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