def trim(s): i=0 j=-1 if len(s) == 0: return '' while i<len(s) and s[i]==' ': i += 1 if i==len(s): return '' while s[j]==' ': j += -1 if j==-1: return s[i:] return s[i:(j+1)]
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dly君
def trim(s): i=0 j=-1 if len(s) == 0: return '' while i<len(s) and s[i]==' ': i += 1 if i==len(s): return '' while s[j]==' ': j += -1 if j==-1: return s[i:] return s[i:(j+1)]