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课后作业

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萌萌小喵姐

#1 Created at ... [Delete] [Delete and Lock User] 
def trim(s):
	while len(s) > 0 and s[0] == " ":
		s = s[1:]
	while len(s) > 0 and s[-1] == " ":
		s = s[:-1]
	return s
	
# 测试:
if trim('hello  ') != 'hello':
    print('测试失败!')
elif trim('  hello') != 'hello':
    print('测试失败!')
elif trim('  hello  ') != 'hello':
    print('测试失败!')
elif trim('  hello  world  ') != 'hello  world':
    print('测试失败!')
elif trim('') != '':
    print('测试失败!')
elif trim('    ') != '':
    print('测试失败!')
else:
    print('测试成功!')
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