pythonchallenge闯关 第10题

Posted 2020-10-09

10、Hint:（1）a=[1,11,21,1211,111221,

　　　　 （2）len(a[30]) = ?

找规律：1 1个1 2个1 1个2,1个1 1个1,1个2,2个1

每一个都是对前一个的总结，把个和,去掉就是结果

a1 = 1

a2 = 11

a3 = 21

a4 = 1211

a5 = 111221

a6 = 312211

a…… = ……

import re
def describe(s):
    return ‘‘.join([str(len(m.group(0))) + m.group(1) for m in re.finditer(r‘(\d)(\1*)‘,s)])
s = ‘1‘
for dummy in range(30):
    s = describe(s)
print(s)
print(len(s))

（10）

len(a[30]) = 5808

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