Online Lower Case Converter

How do I take a string and convert it to lower or upper case in Ruby?

Write a Java program that reads a text file and writes the content into a new file. During the read-write process, convert all the upper case letters into lower case ones. In other words, your programming task is to create a new file with the same content of the original file, only that all the upper case letters are converted into lower case ones in the new file

When I run this code, no matter the file name it is showing it does not exist. I have created a file named input.txt and it is supposed to convert the data into all lowercase letters.

import java.io.*;import java.util.Scanner;public class UpperCaseFileConverter{    public static void main(String[] args) throws IOException    {    Scanner scanner = new Scanner(System.in);    String userFileName;    System.out.println( "Please enter file name. Please enter \"input.txt\" ");    userFileName = scanner.nextLine();    File file = new File(userFileName);    while(!file.exists() )    {        System.out.println( userFileName + " does not exist. Please try again.Please enter \"input.txt\" ");        userFileName = scanner.nextLine();        file = new File(userFileName);    }    Scanner fileToScan = new Scanner(file);    PrintWriter fileToWrite = new PrintWriter ("OUTPUT.TXT");    while(fileToScan.hasNext() )    {        fileToWrite.println( fileToScan.nextLine().toLowerCase() );    }    fileToWrite.close();    fileToScan.close();    }}

The output should create a new file but it just keeps saying the files do not exist.

I am trying to create a gui helps me to update existing xlsm file easier in a simple gui.

So I need now to create a UI Element Searchbox with filters some thing like this

so how to update this xlsm file by create a gui like this with a simple list view contains check boxes contains master primary key values in column in existing xlsm file, as I think pandas and openpyxl could help me to create an array and put this column values in this check box list, and this is the excel file I want to updatem and this column I marked I want want to put this values in this list check box

.

So If there's any way to create some thing like this or tutorial for this?

I Tried to create something like this but without check boxe.

and this is my code

from tkinter import *import pandas as pdimport os# First create application classclass Application(Frame):    def __init__(self, master=None):        Frame.__init__(self, master)        self.pack()        self.create_widgets()    # Create main GUI window    def create_widgets(self):        self.search_var = StringVar()        self.search_var.trace("w", lambda name, index, mode: self.update_list())        self.entry = Entry(self, textvariable=self.search_var, width=13)        self.lbox = Listbox(self, width=45, height=15)        self.entry.grid(row=0, column=0, padx=10, pady=3)        self.lbox.grid(row=1, column=0, padx=10, pady=3)        # Function for updating the list/doing the search.        # It needs to be called here to populate the listbox.        self.update_list()    def update_list(self):        search_term = self.search_var.get()        # Just a generic list to populate the listbox        mydir = (os.getcwd()).replace('\\', '/') + '/'        mySiteCode = pd.read_excel(r'' + mydir + 'Governance_Tracker - Copy - Copy.xlsm', usecols=['SiteCode'],                                        encoding='latin-1', header=1)        a = mySiteCode['SiteCode'].values.tolist()        self.lbox.delete(0, END)        for item in a:            if search_term.lower() in item.lower():                self.lbox.insert(END, item)root = Tk()root.title('Filter Listbox Test')app = Application(master=root)print'Starting mainloop()'app.mainloop()

I'm using notepad++ and I'm finding that when I use regex to search for strings where I specifically want to find lowercase letters ("[a-z]") it will sometimes return uppercase letters.

I originally was searching using the string:

^[A-Z][a-z].+?$

With the purpose of deleting any line in my file that began with an uppercase character, followed by a lowercase, followed by anything until the end of the line. However, this returned lines like, "CLONE" and "DISEASE" which were only capital letters. Out of curiosity, I tried:

^[a-z].+?$

And it still returned those lines in all-caps. Finally, I tried:

^[\u0061-\u007A].+?$

And it still returned lines of all-caps text. Is there something outside of my brackets that's causing this to happen?

I have a large number of data frame objects, and I want to apply a function that only converts the character strings to lowercase and leaves the classes of every thing else alone.

I have tried mutate_all(df,tolower) but that affected all variables/columns

I have tried mutate_at(names(select_if(df,is.character)),tolower) and this does work on an individual dataframe. But I need to do this across many data frames all at the same time. I am really bad at Iteration and loops, so if code that iterates this line of code over every object may be a solution.

Or, because I also have these dataframes in a list, I have tried

modify_depth(df,.depth = 2, mutate_at(names(select_if(,is.character)),tolower))But that did not work. modify is in the purrr package

library(dplyr)library(purrr)data_frame_Rate_Table <- data.frame(Policy_Class = c("rED", "WhIte","BlUe"),                                   Rate=c(3,9,19),"Factor_1"= 1:3, Factor_2=7:9, stringsAsFactors = FALSE)data_frame_Policyholders <- data.frame(Policy_number  = 1:10,                                       Policy_Class=rep(c("REd","red","wHite","BLue","bluE"),2),                                       Risk=c(rep("HiGh",5),rep("LOW",5)),                                        Lapse=rep(c("Y","N"),5), stringsAsFactors = FALSE)data_frame_list <- list(data_frame_Policyholders, data_frame_Rate_Table)

I would just like all character strings to be lowercase without affecting the other classes.