You have to remember the position by calling file.tell() before the readline and then calling file.seek() to rewind. Something like: fp = open(‘myfile’) last_pos = fp.tell() line = fp.readline() while line != ”: if line == ‘SPECIAL’: fp.seek(last_pos) other_function(fp) break last_pos = fp.tell() line = fp.readline() I can’t recall if it is safe to call … Read more
Just in case someone stumbles upon here in future Node 11.7 added support for this using async await const readline = require(‘readline’); //const fileStream = fs.createReadStream(‘input.txt’); const rl = readline.createInterface({ input: process.stdin, //or fileStream output: process.stdout }); for await (const line of rl) { console.log(line) } Remember to wrap it in async function(){} otherwise you … Read more
Apple does not ship GNU readline with OS X. It does ship BSD libedit which includes a readline compatibility interface. The system Pythons shipped by Apple and the 64-bit/32-bit Pythons from python.org installers are built with libedit. The problem is that the commands supported by libedit are completely different from those of readline (see for … Read more
lines = open(filename).read().splitlines()
I open info readline and found: — Function: int rl_expand_prompt (char *prompt) Expand any special character sequences in PROMPT and set up the local Readline prompt redisplay variables. This function is called by `readline()’. It may also be called to expand the primary prompt if the `rl_on_new_line_with_prompt()’ function or `rl_already_prompted’ variable is used. It returns … Read more
I advise you to go with Scanner instead of DataInputStream. Scanner is specifically designed for this purpose and introduced in Java 5. See the following links to know how to use Scanner. Java Documentation Java Tutorial Example Scanner s = new Scanner(System.in); System.out.println(s.nextInt()); System.out.println(s.nextInt()); System.out.println(s.next()); System.out.println(s.next());
As someone already wrote in a comment, you don’t have to use the cat before readline(). Simply write: readline(prompt=”Press [enter] to continue”) If you don’t want to assign it to a variable and don’t want a return printed in the console, wrap the readline() in an invisible(): invisible(readline(prompt=”Press [enter] to continue”))
As @Ron Reiter pointed out, you can’t use readline() because cout doesn’t print newlines implicitly — you either need std::endl or “\n” here. For an interactive use, when you can’t change the child program, pexpect module provides several convenience methods (and in general it solves for free: input/output directly from/to terminal (outside of stdin/stdout) and … Read more
is there any performance difference related to these methods? YES there is a difference File.ReadAllLines() method reads the whole file at a time and returns the string[] array, so it takes time while working with large size of files and not recommended as user has to wait untill the whole array is returned. File.ReadLines() returns … Read more
You should add “throws IOException” to your main method: public static void main(String[] args) throws IOException { You can read a bit more about checked exceptions (which are specific to Java) in JLS.