def trim(str):
while str != '':
if str[:1] == ' ':
str = str[1:]
elif str[-1:] == ' ':
str = str[0:-1]
else:
break
return str
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孤o赦免你
def trim(str):
while str != '':
if str[:1] == ' ':
str = str[1:]
elif str[-1:] == ' ':
str = str[0:-1]
else:
break
return str