識(shí)別字符串是否以特定字母開(kāi)頭

print(s.startswidt('d'))

8.根據(jù)頻率對(duì)列表的值進(jìn)行排序

from collections import Countercount = Counter([7,6,7,8,9,7,9])print("根據(jù)頻率對(duì)值進(jìn)行排序：",count.most_common(2))

9.將兩個(gè)列表合并成一個(gè)字典

number = [1,2,3]cities = ["北京","上海","深圳"]resutlt = dict(zip(number,cities))

Python 字符串

count函數(shù)：返回尋找的對(duì)象，在字符串里面出現(xiàn)的次數(shù)

>>> a = "關(guān)注《數(shù)據(jù)》，學(xué)會(huì)數(shù)據(jù)分析">>> a.count("數(shù)據(jù)")2>>> a.count("數(shù)據(jù)",0,10)#在區(qū)間【0-10】1

find函數(shù)：如果對(duì)象包含在字符串內(nèi)，則返回開(kāi)始的索引值，否則返回-1，rfind（）返回的是最后一次出現(xiàn)的位置

>>> a = "關(guān)注《數(shù)據(jù)》，學(xué)會(huì)數(shù)據(jù)分析">>> a.find("數(shù)")3>>> a.rfind("數(shù)")9