x = 'ab123abc123123123123abcabcabc123123123123123123123abcabc'
index = 0
count = 0
longest = 0
while index < len (x) :
if x [index] == '1' :
index += 1
if x [index] == '2' :
index += 1
if x [index] == '3' :
count += 1
if count > longest :
longest = count
else : count = 0
index += 1
print (longest)
这里有一种方法:
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