hi everyone :)
my problem is, up until now, i have exclusively used tabs to indent python, as i find it easier than spaces, but for no reason i know, python interactive prompt, the basic python.exe one, suddenly refuses to accept the tab button, all it does is flash the cursor. all i can think of is that my computer in suddenly treading the window like any other, using tab to cycle input things, in this case the single one. also, before now, i could use the up button to reach previously typed code, the if i submit that line with no changes, use the down button to access the line that came after it, but now up works, but as if i had changed the line, eg moves me back to the "bottom" of the list of inputs, so down doesn't work.... my question simply is: how do i get my good old tab and down button to work like i want them to again? :(
thanks xxx
If you are using Windows with the standard cmd.exe console (and it would have been helpful for you to have stated this up front) then you can use the TAB and arrow keys exactly as you desire.
I recently observed this behavior too, on Windows, using cmd.exe. It also happens with Console2 - an alternate shell I sometimes use.
Though I do always use spaces in normal code in an editor, I had been accustomed to using the Tab key to indent in short multi-line inputs in the interactive python.exe interpreter. Recently that stopped working - pressing the Tab key flashes the cursor and doesn't indent. Using spaces does work fine here, though it's not as convenient past a couple of indentations.
I suspect (but am not certain) that the cause was installation of pyreadline or rlcompleter - I had been messing with trying to get tab completion in an interpreter in an embedded application on Windows. Of course in your case another installation could have included those packages.
Related
I know these are questions: this and this and this. I have tried all of these methods in pycharm, but they either a) not work or b) I get a weird character on my screen, that looks like a 0 with diagonal line going through it. I can't copy it for some reason, so I can't show you.
For instance this:
import os
from time import sleep
print("lots of text")
sleep(5)
os.system('cls')
What should happen in the above is tht the message should be displayed for 5 seconds then disappear, but all I get is that weird character... In contrast when I ran my python program from command line, it worked as expected i.e. the screen cleared. I am very confused.
So my questions are:
Why don't any of them work in pycharm?
What does work in pycharm?
Ok, so, I have been having this problem as well — after scouring the internet, the os commands work BUT you need to enable the terminal emulator.
In the PyCharm toolbar, click Run, Edit Configurations, and the toggle for "Emulate Terminal in Output Console" should be under Execution in the pop up. Emulate Terminal toggle
I had to get help from the PyCharm team on this one, so here's to them responding at lightning speed.
Answer
The cls command doesn't work on a standard pycharm project because it is an IDE and certain os commands don't work in the same way it would with the windows command line.
There is currently no way to clear the console output in PyCharm, other than to manually do it by using the cls command through the terminal in PyCharm or through a keyboard shortcut set through the pycharm preferences menu. You can try to emulate a keyboard shortcut, but this would be difficult, and unless you absolutely need it, I would not recommend clearing the terminal output after a program is run.
References and Additional Links
https://teamtreehouse.com/community/clear-screen-for-pycharm-as-if-it-were-on-console-or-cmd
I don't know in which version of PyCharm this was introduced. I guess it must have been after this question was asked.
The way to clear the PyCharm Python Console is by using the context menu. Right mouse click in the upper part of the console (where the lines with >>> prompts are closer together) and select Clear All.
Alse see this PyCharm Support Community article.
Incidentally, none of the questions linked to in the OP's original post relate to PyCharm and do not answer the OP's question.
cls only temporarily clears it. Next command brings back all previous messages. The best option is to right click on the Terminal and choose Clear Buffer
Eclipse has suddenly started doing something weird and has become unusable. I'm using the PyDev editor.
When I type a regular letter, for example, t, and then Enter, Eclipse changes it to a complete word. In the case of t, it becomes "TabError". A becomes "And", b becomes "break" and so on.
It just suddenly started happening as I was typing in the editor. I don't know what combination of keys I must have pressed to start this behavior. I've tried restarting my computer.
I don't know why the behaviour has changed for you, however what you are describing is behaviour as expected in the PyDev editor, i.e. if I have:
import time
t
and my cursor is just after the t, then I see auto completions pop-up and if I press Enter the selected completion is inserted. Here is a screenshot just after I typed t:
The screenshot in #aleroot's answer documents this with Note: Enter will always apply the completion, further recommending Note: Shift-Enter can be used if you want a new line without applying a completion. These same notes apply to editing Java code in the Java Editors
So what you are seeing is intended behaviour.
However, you may not like such autocompletions, so I recommend tuning them. In particular, you probably want to turn off Request completion on all letter chars and '_'? Making this change will more closely match the default behaviour in the Java editor which by default automatically shows completions only on ..
To tweak those preferences you have to go to :
Preferences->PyDev->Editor->Code Completion
How to clear console in sublime text editor.
I have searched on internet too..But can't find proper shortcut for that.
Please provide info
I assume you're talking about the console accessible via View -> Show Console or Ctrl`. Unlike other answers on SO, which deal with clearing the Python console when opened from the command prompt, os.system("cls") or os.system("clear") (depending on your OS) don't work with the Sublime console. The Sublime API (version 2 or version 3) does not have any built-in console-clearing method, and I was unable to find any undocumented method in sublime.py or sublime_plugin.py. The console appears to be read-only, as selecting all the text and hitting Delete doesn't work either.
I've been looking into this for some time, and I've come to the conclusion that it does not appear to be possible. However, there is a hackish workaround - just run print('\n'*100) to print 100 newline characters, and you won't be able to see any of the previous output unless you scroll up some distance.
I installed ClearConsole package, then type alt+k to clear then console.
A new window will always have a clean console. You can use this to open a new window, close the old one and then reopen your project (assuming it is a saved project and not anonymous). This requires the hot_exit setting to be true, which is the default.
IDLE is being very dodgy as to when it will actually show an Auto-complete menu. As of late it hasn't been working at all, or, more specifically, only works during an interactive session.
I've been using Code Blocks for C, and have gotten really used to the very nice auto-complete features, so it's a bit frustrating not having them -- especially while trying to learn a new frame work and what class is associated with which methods, etc, etc..
Is there an easy fix to get IDLE auto-complete working again? I'm using python version 2.7.
Is there perhaps a simple editor I should look into? I've tried Vim, which was a little too heavy for my simple needs, Ninja, which I couldn't get to work for anything, and Sublime text 2, which I couldn't get my wxpython stuff to play with. What would a nice option be? Anything similar to Code Blocks would be cool, although, I'd be perfectly happy with IDLE if it would consistently work!
REQUESTED CLARIFICATION:
OK, so it seems I may have some of my terminology backwards. By non-interactive, I mean, for instance, right clicking on a python file and selecting "edit with IDLE". This brings up what I guess could be described as a text editor. You can enter all you code here. Once ready, you then hit F5, or select Run, and it launches (what I've been referring to as) the interactive terminal. It's here that you can type in code, press return, and instantly have that code evaluated.
What my question is referring to it the former, the part of IDLE where you edit the code. Sometimes while typing, after a . it will display the available methods, or after an open parenthesis it'll give hints as to the values expected. but the thing is, sometimes it does these things, sometimes it doesn't.
The only thing i found so far is that if an editing session of IDLE is connected with python shell (called "interactive mode" in the question, i.e. after an attempt to run the edited script) then "non-interactive" IDLE can autocomplete based on values in interactive window. For example, if I type
a = [];
a.appen
and then hit < Tab > it will do nothing, but if I previously type
a = []
in corresponding python shell, IDLE will autocomplete correctly.
So my only suggestion is import same modules with same names in python shell window in order to make them "visible" for non-interactive IDLE editor.
I had the same problem with IDLE, because I want to learn Qt and therefore autocompletion is very useful.
As it says in the settings of IDLE, you can trigger the autocomplete with "Control + Space", e.g. after a "QtGui.". Then a menu opens where you can arrow-scroll through the entries.
using the 'IDLE Editor window', you need to save and execute your code first.
The application running, turn back to the Editor window to use the auto-completion.
In my case, I had to open Options menu -> Extensions tab on the editor and look to make sure AutoComplete and other relevant options were enabled. They actually were, but by just clicking on 'Apply' even though I dint have to change anything did the trick for me.
Sometimes it has to do with the time you have to wait to get a suggestions.
When you go to options > extensions > general at completions popup wait you can change it to about 500ms.
In my case it was 2000ms by default.
Can someone help me out please...I'm trying to start my first programming project. It will be implemented in python.
I need to have a textbox (which i am using wxpython for). If the user enters any text into this text box, then I want it to appear as arabic. I wanted to this by automagically changing the users Keyboard to an arabic layout when the cursor lands in the given text box.
So i found this pywin32 module, which has a function LoadKeyboardLayout()
So i am trying to test this in IDLE, to see if I can make it accept arabic text into IDLE, to see if it works. So I enter, into IDLE:
win32api.LoadKeyboardLayout('00000401',1)
This then returns, 67175425, the decimal equivalent of hex:'4010401' whcih I believe is the locale ID for Arabic. SO I think wow! I've done it, but when I try typing after this, in the IDLE window, it continues to type normal english characters.
Can someone please explain my errors and guide me towards a good solution.
UPDATE
Okay, I've been trying to solve this problem ever since posting the damn question.
No luck.
Then, I thought, "ok, screw it, instead of testing it quicly in IDLE, I will just try it out, in situ, in my source code for the project."
WTF - it worked first time, giving exact behaviour that I wanted.
Then I tried it in a different IDE, in the interpreted window, and again, IT WORKED straight away!
So clearly my issue is with IDLE, in its interpreting mode.
Can anyone explain why it doesn't work in the IDLE shell???
Keyboard layout setting in Windows is per-process (and inherited from the parent process)
IDLE runs your Python script in a background process separate from its GUI
So you have successfully changed the keyboard layout of the background Python process that is running your script, but not of IDLE's GUI.