The Unresponsive Terminal During your Unix session, your terminal may not respond when you type a command, or the display on your screen may stop at an unusual place. That’s called a “hung” or “frozen” terminal or session. Note that most of the techniques in this section apply to a terminal window, but not to non-terminal windows such as a web browser. A session can hang for several reasons. For instance, your computer can get too busy; the Terminal application has to wait its turn. In that case, your session starts by itself after a few moments. You should not try to “un-hang” the session by entering extra commands, because those commands will all take effect after Terminal comes back to life. On some systems, the name of the starting directory must end with a / (slash), or the find command will return nothing. Thus, the starting directory in the previous example would be designated as /prog/, with a trailing slash. On other systems, a trailing slash does not affect the command. Press the Return key once. You may have typed text at a prompt (for example, a command line at a shell prompt) but haven’t yet pressed Return to say that you’re done typing and your text should be interpreted. Try job control (see ); type Control-Z. This control key sequence suspends a program that may be running and gives you a shell prompt. Now you can enter the jobs command to find the program’s name, then restart the program with fg or terminate it with kill. Press Control-C or -. This interrupts a program that may be running. (Unless the program is run in the background; as described in, the shell waits for a background program to finish before giving a new prompt. A long-running background program may thus appear to hang the terminal.) If this doesn’t work the first time, try it once more; doing it more than twice usually won’t help. Type Control-Q. If output has been stopped with Control-S, this will restart it. (Note that some systems will automatically issue Control-S if they need to pause output; this character may not have been typed from the keyboard.) Type Control-D once at the beginning of a new line. Some programs (such as mail) expect text from the user. A program may be waiting for an end-of-input character from you to tell it that you’ve finished entering text. Typing Control-D may cause you to log out, so you should try this only as a last resort. Otherwise, close your Terminal window and open a new one. With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more. And a Code Editor A code editor helps with reading and writing programming code. There are many around, and it is one of the most personal choices a programmer can make - Like a tennis-player choosing their racket, or a chef choosing their favourite knife. To start off with, you’ll just want a basic, easy-to-use one that doesn’t get in your way, but is still effective at writing python code. Here are some suggestions for those: •: A new code editor available for Windows, Mac and Linux. It’s an open-source project developed by GitHub and is very easy to add functionality for, with its packages system. •: A great all around editor that’s easy to use. The free Xerox Global Print Driver manages Xerox and non-Xerox printers on your network with a single, easy-to-use interface. It dramatically simplifies enterprise printer management for IT managers, making it easy to add and update printers without changing drivers. Xerox 205 driver updates for latest mac system. It’s Ctl+B shortcut lets you run the python file you’re working on straight away. Runs on Windows, Mac and Linux. •: A simple editor that doesn’t aim to be too complicated. Available on Windows and Linux (you can probably find it in your package manager). •: One of the most famous code editors for Mac, it used to be a paid product but has since been open-sourced. • and: if you run Linux using Gnome or KDE respectively, you might already have one of these two installed! •: a sleak, free editor for Mac, Windows and Linux, based on the more powerful Komodo IDE. If you’d like our recommendation, try out Sublime Text first. What is Python, exactly? Ok, so python is this thing called a programming language. It takes text that you’ve written (usually referred to as code), turns it into instructions for your computer, and runs those instructions. We’ll be learning how to write code to do cool and useful stuff. No longer will you be bound to use others’ programs to do things with your computer - you can make your own! Practically, Python is just another program on your computer. The first thing to learn is how to use and interact with it. There are in fact many ways to do this; the first one to learn is to interact with python’s interpreter, using your operating system’s (OS) console. A console (or ‘terminal’, or ‘command prompt’) is a textual way to interact with your OS, just as the ‘desktop’, in conjunction with your mouse, is the graphical way to interact your system. Running Python files When you have a lot of python code to run, you will want to save it into a file, so for instance, you can modify small parts of it (fix a bug) and re-run the code without having to repeatedly re-type the rest.
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