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垃圾写的垃圾代码

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MRZ轲信御马上

#1 Created at ... [Delete] [Delete and Lock User] 
def trim(a):
    if not isinstance(a,str):
        raise TypeError('参数必须为str类型')
    if a=='':
        return a
    b=list(a)
    while b[-1]==' ':
        b.pop()
        if b == []:
            return ''
    while b[0]==' ':
        b.pop(0)
    return ''.join(b)

Matters_

#2 Created at ... [Delete] [Delete and Lock User]

学习了，谢谢。 做了一点改动，去除space：

def trim(a):
if not isinstance(a,str):
    raise TypeError('参数必须为str类型')
if a==''or a.isspace():
    return ''
b=list(a)
while b[-1].isspace():
    b.pop()
    if b == []:
        return ''
while b[0].isspace():
    b.pop(0)
return ''.join(b)

测试：

if trim('hello  ') != 'hello':
    print('测试失败! 1')
elif trim('  hello') != 'hello':
    print('测试失败! 2')
elif trim('  hello  ') != 'hello':
    print('测试失败! 3')
elif trim('  hello  world  ') != 'hello  world':
    print('测试失败! 4')
elif trim('\t\n'+'hello\tword') != 'hello\tword':
    print('测试失败! 5')
elif trim('') != '':
    print('测试失败! 6')
elif trim('    ') != '':
    print('测试失败! 7')
else:
    print('测试成功!')
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