I am brand new to Python, and tried downloading Python on my computer but had some issues because I have a very old Macbook that can only run OSX 10.6. I have been trying to use Python Anywhere, but I cant seem to edit the code I write in the console. For example, if I write a bunch of code and then run it and get an parentheses error, I have to re-enter all of that code onto the next command line and add the parentheses rather than just adding the parentheses to the code and re-running it. I can just copy and paste the bad code onto the new line, fix the error, and then re-run the code, but this gets tedious. Sorry if this is a dumb question, but I have used R a bit before and in R you can simply edit the code, then run it again, so I am wondering if there is a way to write Python code in this same manner.
There's two main ways of entering code into PythonAnywhere:
the first is to type it interactively into a live interpreter or "Console". You do that from the PythonAnywhere "Consoles" tab. it sounds like that's what you've done so far
the second is to create a file. You do that via the "Files" tab. if you create a new file with a .py ending (eg hello.py) PythonAnywhere will bring up an editor which you can use to save a file, and then you can run it, see the output below the editor, then make changes, re-run, etc.
Related
I do most of my Python coding in Notepad++. I would like a way to quickly and easily reformat my code using the default rules from PyCharm - things like spacing, number of blank lines between functions etc.
I find black playground too harsh for my requirements, and opening up PyCharm to paste code and reformat it defeats to purpose of using Notepad++ (for it's lightness).
So do you know of either a plugin for Notepad++ which does this (and I'm not just referring to Python Indent), or an online resource which applies PyCharm style formatting to pasted code?
PyCharm comes with a CLI, like documented here https://www.jetbrains.com/help/pycharm/command-line-formatter.html.
Alternatively and making the call slightly shorter: parallel to the mentioned there general batch file, you probably also have 'format.bat'. You can integrate this into Notepad++ via the [F5] button "Run...":
Put there
C:\__YourPyCharmRoot__\bin\format.bat "$(FULL_CURRENT_PATH)"
and press the [Save] button in this "Run..." dialog to assign a short-cut.
Pressing the newly defined short-cut on a saved and writable Python file should let Notepad++ ask you after a while (of running PyCharm in Windows cmd.exe) to reload the changed file .
End goal: After running a script regardless of ending perfectly or erroring out, I would like to have my ipython environment revert back to the directory it was in before running the script.
I have successfully used the advice given in the SO post,
how-do-i-change-directory-back-to-my-original-working-directory-with-python.
This works great if the script runs without failing.
Ideas:
1) I have considered wrapping my code in one large try: and except: utilizing the advice in the post mentioned above. As this would surely handle the issue. However, it seems tedious and unnecessary to have to write this into all my scripts.
2) I was thinking a good a solution would be to have ipython automatically run a "revert directory" script after every user ran script, that would change the directory back to the original one. I have looked around a bit to see how one would configure ipython to run a script automatically after every run. From my search so far I have not found this to be an option. I was expecting to find a method to accomplish this through the ipython config file.
3) Another solution that would be easy would be to somehow use the information found by using the line magic command %dhist. As the first result given by this command is the original directory that ipython was opened in. However, other than having the results print from executing the command %dhist... I am not sure how to work with the printed information.
4) I must be not searching the right terms, as I feel like this is probably something that is possible or has been asked. If indeed someone has asked this, please point me in the right direction and I will remove this question promptly.
Relevant information:
Working on os x
Using Jupyter QtConsole 4.3.1
IPython 6.2.1
I know some basics of Java and C++, and am looking to learn Python
I am trying to develop some random stuffs to get a good feel of how it works, but i can only make 1 line scripts that run every time i press enter to go to the next line.
I've seen tutorial videos where they can just open up files from a menu and type away until they eventually run the program.
I'm using IDLE, and i don't see options to open up new stuffs; I can only make one or two line programs. When i tried to make a calculator program, i didnt know how to run it because it ran every line of code i typed in unless there were ...'s under the >>>'s.
I think it's because i am in interactive mode, whatever that is.
How do i turn it off, if that's the problem?
There are many different options for writing python scripts. The simplest to use is Idle, it come with the Python download. Within Idle, create a new document to write a script. Once finished, save it as a .py file, and you can run it within Idle. For my personal setup, I use the text editor Atom. I can create documents easily, and run them through the terminal on my computer. Hope this helps.
To exit out of the "interactive mode" that you mentioned (the included REPL shell in IDLE) and write a script, you will have to create a new file by either selecting the option from the top navigation bar or pressing Control-N. As for running the file, there's also that option on the navigation bar; alternatively, you can press F5 to run the program.
EDIT: The code I wrote in my Python file was just this:
print "foo"
I'm using Windows XP Home Premium on this tiny little HP Mini 1000, and I want to run Python files, since we're learning it in school. I am aware of this topic, so I tried to run Python files using a batch file (python.bat), and I'm getting an error that says, "Can't find 'main' module in ''" whenever I run the batch file. I followed the instructions given here. All I did was change "Python26" to "Python33" because of the difference in versions.
Any idea what's wrong here? I really want to run Python files from Notepad++, so I don't want any alternative ways to run them.
This sounds like you don't have PYTHONPATH set up correctly. I suggest you review the documentation here:
http://docs.python.org/2/using/windows.html
Instead of calling Python, call cmd.exe and then use the set command to inspect which variables are set and how they are set. Run the exit command to leave the command shell. When you think you have the variables set up correctly, try again to run Python.
Good luck and have fun!
I use the command line interpreter or IDLE mostly (Win 8.1 now, but I've done so since Win XP SP2), but NPP is my main text editor, so I was curious about this issue.
When I was reproducing this, I was able to generate several errors, but the only one I got that was an exact match was when I failed to configure the Run option correctly.
You need to make sure to follow this step exactly in the instructions you were following. When you navigate to Run -> Run in Notepad++, you have to enter this exactly:
C:\Python33\python.bat "$(FULL_CURRENT_PATH)"
I am pretty sure you left out the "$(FULL_CURRENT_PATH)", or otherwise didn't add it correctly, as failing to do so causes exactly the same error on my end. Failing to include this means that when you run the batch script, you get the wrong input to the Python interpreter, causing the error.
I'm working on a small game and, in the interest of full disclosure, I've learned some other languages before but this is only my second day learning Python.
What I was trying to do was simple enough: I was trying to generate a random integer between two integer values (e.g. random(a,b)). I looked around to see if there was an existing function that I could use, and I found information about a function called "randint". So I added a line of code to my program that looked something like:
value = randint(1,15)
I received an error that randint was undefined. So then I looked further and saw someone state that I needed to import the random library using the following line of code:
import random
The moment I refreshed (F5) IDLE crashed. So then I figured "welp, that was wrong" and I went to open IDLE and make the change. I was able to open IDLE, but I can't open the file. In fact, I can't open any of the (three) files that I've made. I opened the file in Notepad++ and removed the offending lines (both randint and import random), but IDLE still crashes whenever I try to open a file. I rebooted my laptop for lack of a better idea, but there was no change in behavior.
Details: Windows 7 x64 w/ all updates, Python 3.2.3.
...help? Also, what did I do? :-/
Received a solution from another forum:
"If you want to try diagnosing the problem, run the Python command line and then enter the line:
from idlelib import idle
That will launch idle, and you should get a traceback in the command prompt if something goes wrong."
When I did this it opened IDLE and produced an error (displayed in terminal) when I tried to open the file. Rather than crashing, I received a prompt (pop-up, not in terminal) to save the file. I found this odd because I had just opened it and hadn't made any changes. I let it save the file and then success! Now I can use IDLE to open any of my files again. Hope this helps someone else who encounters this issue :)
I'm not sure if this is helpful, but based on my experience, IDLE was never reliable enough for me. Practice using the command-line Python instead.
Go to the command prompt by running cmd
cd into your file's directory
type python yourfilename.py