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先剪除左边的空格 再剪除右边空格，方法很傻但是测试通过

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用户5318353752

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

def trim(s):

trim left first

n = len(s)
print('length of',s,'is :',n)
bb = 0
i = 0
while (i<n and s[i] == ' '):    
        print('s',i,'is',s[i])
        i = i + 1
        bb = i                    
print('bb is:',bb)
left_trim = s[bb:]
print('s is:',s)
print('left_trim is:',left_trim)

then trim right

n2 = len(left_trim)
print('length of',left_trim,'is :',n2)
ii = n2 - 1
bbb = n2 - 1
while (ii>=0 and left_trim[ii] == ' '):
    print('current ii is:',ii)
    print('left_trim',ii,'is',left_trim[ii])        
    ii = ii - 1
    bbb = ii
print('bbb is:',bbb)
right_trim = left_trim[:(bbb+1)]   
print('right_trim is:',right_trim)
return right_trim

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('') != '': print('测试失败! 5') elif trim(' ') != '': print('测试失败! 6') else: print('测试成功!')

用户5318353752

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

C:\Users\hp\AppData\Local\Programs\Python\Python37\work>python 5.py length of hello is : 7 bb is: 0 s is: hello left_trim is: hello length of hello is : 7 current ii is: 6 left_trim 6 is current ii is: 5 left_trim 5 is bbb is: 4 right_trim is: hello length of hello is : 7 s 0 is s 1 is bb is: 2 s is: hello left_trim is: hello length of hello is : 5 bbb is: 4 right_trim is: hello length of hello is : 9 s 0 is s 1 is bb is: 2 s is: hello left_trim is: hello length of hello is : 7 current ii is: 6 left_trim 6 is current ii is: 5 left_trim 5 is bbb is: 4 right_trim is: hello length of hello world is : 16 s 0 is s 1 is bb is: 2 s is: hello world left_trim is: hello world length of hello world is : 14 current ii is: 13 left_trim 13 is current ii is: 12 left_trim 12 is bbb is: 11 right_trim is: hello world length of is : 0 bb is: 0 s is: left_trim is: length of is : 0 bbb is: -1 right_trim is: length of is : 4 s 0 is s 1 is s 2 is s 3 is bb is: 4 s is: left_trim is: length of is : 0 bbb is: -1 right_trim is: 测试成功!

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