我得到一个字符串,需要根据子字符串的长度找到其中的第一个子字符串,例如:给定字符串 'abaadddefggg' for length = 3 我应该得到 'ddd' 的输出 for length = 2 我应该得到 ' aa' 等等有什么想法吗?
One approach in Python 3.8+ using itertools.groupby
combined with the walrus operator :
from itertools import groupby
string = 'abaadddefggg'
k = 3
res = next(s for _, group in groupby(string) if len(s := "".join(group)) == k)
print(res)
Output
ddd
An alternative general approach:
from itertools import groupby
def find_substring(string, k):
for _, group in groupby(string):
s = "".join(group)
if len(s) == k:
return s
res = find_substring('abaadddefggg', 3)
print(res)
You could iterate over the strings indexes, and produce all the substrings. If any of these substrings is made up of a single character, that's the substring you're looking for:
def sequence(s, length):
for i in range(len(s) - length):
candidate = s[i:i+length]
if len(set(candidate)) == 1:
return candidate
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