def trim(s):
if s == '':
return s
else:
bools = False
boole = False
for i in range(len(s)):
if s[i] != ' ':
start = i
bools = True
break
for i in range(1,len(s)):
if s[-i] != ' ':
ending = -i
boole = True
break
if not bools or not boole:
return ''
elif ending == -1:
return s[start:]
else:
return s[start:ending+1]
晴朗天空思雨
def trim(s): if s == '': return s else: bools = False boole = False for i in range(len(s)): if s[i] != ' ': start = i bools = True break for i in range(1,len(s)): if s[-i] != ' ': ending = -i boole = True break if not bools or not boole: return '' elif ending == -1: return s[start:] else: return s[start:ending+1]