day3
Topic sourcedef trim(s):
if s == ' ' or s is None:
return ''
start = 0
end = len(s)
while s[start:start+1] == ' ':
start = start+1
while s[end-1:end] == ' ':
end = end-1
return s[start:end]
- 1
def trim(s):
if s == ' ' or s is None:
return ''
start = 0
end = len(s)
while s[start:start+1] == ' ':
start = start+1
while s[end-1:end] == ' ':
end = end-1
return s[start:end]
追逐我的昨天