substring

问题 This seems like it should be pretty trivial, but I am new at Python and want to do it the most Pythonic way. I want to find the index corresponding to the n'th occurrence of a substring within a string. There's got to be something equivalent to what I WANT to do which is mystring.find("substring", 2nd) How can you achieve this in Python? 回答1: Mark's iterative approach would be the usual way, I think. Here's an alternative with string-splitting, which can often be useful for finding-related

问题 I would like to trim a character vector to the first five characters in each element. In this example I would like to trim each number in string to the first five characters. I am sure there must be an easy way to do this. string<- c("3243423", "23423", "34243234", "2342", "32544532", "85678657") I would like to have a a vector c("32434", "23423", "34243", "2342", "32544", "85678") 回答1: The following works as well (didn't know about strtrim ) substring(string, 1, 5) 回答2: Figured it out. Hope

问题 I'm trying to make a substring which lets me have up to 6 letters of a surname, however what I have here seems to throw an error when it finds a surname of less than 6 letters, I have been looking for hours for a solution with no sucess :/ id = firstName.substring (0,1).toLowerCase() + secondName.substring (0,6).toLowerCase(); System.out.print ("Here is your ID number: " + id); It's the .substring(0,6) . I need it to be up to 6 letters not exactly 6. The error: Exception in thread "main" java

问题 I would like to filter on whether multiple text columns ([Name], [GenericName], or [SimpleGenericName]) contains a substring from a list. The text is also mixed case so I need to do a Text.Lower([Column]) in there as well. I've tried the formula: = Table.SelectRows(#"Sorted Rows", each List.Contains(MED_NAME_LIST, Text.Lower([Name]))) However, this does not work as the Column [Name] does not exactly match those items in the list (e.g. it won't pick up "Methylprednisolone Tab" if the list

问题 I have the following problem using the substring() Java function. I have to do the following operation: I have a String representing a date having the following form: 2014-12-27 ( YEARS-MONTH-DAY ). And I want convert it into a String like this: 20141227 (without the space betwen date component). So I have implemented the following method that use the substring() method to achieve this task: private String convertDate(String dataPar) { String convertedDate = dataPar.substring(0,3) + dataPar

问题 I have the following problem using the substring() Java function. I have to do the following operation: I have a String representing a date having the following form: 2014-12-27 ( YEARS-MONTH-DAY ). And I want convert it into a String like this: 20141227 (without the space betwen date component). So I have implemented the following method that use the substring() method to achieve this task: private String convertDate(String dataPar) { String convertedDate = dataPar.substring(0,3) + dataPar

问题 Recently I started to analyse a data frame and I want to remove all the substrings that don't contain ('Aparelho Celular','Internet (Serviços e Produtos)','Serviços Telefônicos Diversos','Telefonia Celular','Telefonia Comunitária ( PABX, DDR, Etc. )','Telefonia Fixa','TV por Assinatura','Televisão / Aparelho DVD / Filmadora','Telemarketing') But when I use this syntax- df = df[~df["GrupoAssunto"].str.contains('Aparelho Celular','Internet (Serviços e Produtos)','Serviços Telefônicos Diversos',

问题 Recently I started to analyse a data frame and I want to remove all the substrings that don't contain ('Aparelho Celular','Internet (Serviços e Produtos)','Serviços Telefônicos Diversos','Telefonia Celular','Telefonia Comunitária ( PABX, DDR, Etc. )','Telefonia Fixa','TV por Assinatura','Televisão / Aparelho DVD / Filmadora','Telemarketing') But when I use this syntax- df = df[~df["GrupoAssunto"].str.contains('Aparelho Celular','Internet (Serviços e Produtos)','Serviços Telefônicos Diversos',

问题 I'm trying to make a simple substring search using the brute force technique but I'm getting an error which I can't see. I'm quite new to programming so please keep that in mind. The problem might be very simple. using System; using System.Collections; using System.Collections.Generic; namespace SubstringSearch { class Program { static void Main(string[] args) { Console.Write("Please enter some letters: "); string sequence = Console.ReadLine(); Console.Write("Enter the sequence you want to

问题 using System; class Program { static void Main(string[] args) { string candidateName = Console.ReadLine(); string input = Console.ReadLine(); int numberOfAdmittedPersons = Convert.ToInt32(input); string result = string.Empty; for (int i = 1; i <= numberOfAdmittedPersons; i++) { string listOfAllAdmittedPersons = Console.ReadLine(); { if (i != numberOfAdmittedPersons) { result += listOfAllAdmittedPersons; } } } if (result.Contains(candidateName)) { Console.WriteLine("true"); } else { Console