deffind_substrings(string,substrings):positions=[]forsubstringinsubstrings:index=string.find(substring)positions.append(index)returnpositions# 示例用法string="This is a test string."substrings=["is","test","string"]positions=find_substrings(string,substrings)print(positions)# 输出:[2, 10, 17] ...
index() Return Value If substring exists inside the string, it returns the lowest index in the string where substring is found. If substring doesn't exist inside the string, it raises aValueErrorexception. Theindex()method is similar to thefind()method for strings. The only difference is that...
out.println(index); } /** * indexOf 算法原理 * @param orgin 原始字符串 B = “边叫边练,我喜欢叫练”; * @param serachString 匹配字符串 A=“叫练” * @return int 下标 */ public static int indexOf(String orgin,String serachString) { char[] chars = orgin.toCharArray(); char[] s...
*@paramserachString 匹配字符串 A=“叫练” *@returnint 下标*/publicstaticintindexOf(String orgin,String serachString) {char[] chars =orgin.toCharArray();char[] sChars =serachString.toCharArray();//返回字符串下标intindex = -1;//匹配字符串计数器,用于查询是否匹配到完整字符串ints_index = 0;...
--- IndexError Traceback (most recent call last) <ipython-input-70-e894f93573ea> in <module> ---> 1 word[42] # The word only has 6 characters. IndexError: string index out of range 但在范围内,太大的索引值会默认为字符串的大小,不会导致错误。 如果你总是希望在特定索引处开始切片...
The index method can’t return a number because the substring isn’t there, so we get a value error instead: In order to avoid thisTraceback Error, we can use the keywordinto check if a substring is contained in a string. In the case of Loops, it was used for iteration, whereas in...
string.partition(",") #字符串str中不存在sep",",返回了两个空字符串。 ('https://www.google.com.hk/', '', '') string.partition(".") #字符串str中存在两个"." 但索引到www后的"." 停止索引。 ('https://www', '.', 'google.com.hk/') ...
报错信息:IndexError: string index out of range 06 键错误(KeyError) 在读取字典中的key和value时,如果key不存在,就会触发KeyError错误。 错误示例 d = {'a':1,'b':2} print(d['f']) 错误原因:键‘f’不存在 报错信息:KeyError: 'f' 07 ...
(1)s:string,字符串;(2)d:decimal integer,十进制数;(3)i:integer,用法同%d;(4)u:unsigned integer,无符号十进制数;(5)f:float,浮点数(默认保留小数点后6位);(6)F:Float,浮点数(默认保留小数点后6位);(7)e:exponent,将数字表示为科学计数法(小写e,默认保留小数点后6位);(8)E:Exponent,将数字表...
string.ascii_letters ascii_lowercase+ascii_uppercase的结果 。该值不依赖于本地设置。 string.ascii_lowercase 小写字母 a-z.该值不依赖于本地设置以及不会被修改。 string.ascii_uppercase 大写字母 A-Z.该值不依赖于本地设置以及不会被修改。 string.digits ...