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Viewing all defined variables
(10 answers)
Closed 2 months ago.
Im coming from a MatLab background, and started to pick up Python. In matlab it generates a table of the last value of any parameter while excecuting the code. It really helps in debugging.
is there anything simillar in Python, or is ironning the bugs out, soley based on print('...') to see the values of interest?
Well you can use a proper debugger in python. In Pycharm it's the little bug to the right of the run button.
You can then use break points to stop the code at any time. This is done by clicking to the right of the line number.
If your program hits that break point the program will pause.
if your program is in a paused state you can navigate trough your code with these buttons
Some IDEs, for example, PyCharm, provide the ability to debug.
Related
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Is there a way to turn off hover for certain functions in VSCode?
(1 answer)
Closed 2 years ago.
For example, I don't want it to show the popup description for print() everytime I type it. I do not want to blanket ban all description popups, just want to hide it for specific functions for which I don't need it popping up everytime. Otherwise the description popups for less frequently used definitions are certainly helpful.
Currently, the function definition popup prompt of the python file in VSCode is provided by the python extension.
VSCode does support some custom prompt behaviors, but at present, the pop-up prompt for specific python function definition needs to be further improved.
For the print() you mentioned, the only changes I can make to its related pop-up prompts are: using "editor.quickSuggestions": false, in settings.json to turn off the prompt when you enter print, but specific information will still pop up when you enter (),and then using "editor.parameterHints.enabled" : false, will turn off the () prompt.
More reference: Code analysis settings and AutoComplete settings.
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Finding the Values of the Arrow Keys in Python: Why are they triples?
(3 answers)
Closed 6 years ago.
How can I allow the arrows in raw_input()?
There is a better way?
When I write and I use the left arrow, ^[[D appears.
I am using Linux.
If you are Windows, the cursor keys work normally to allow editing of your input. On Linux, I find that I need to import readline to get the input editing module.
If you Google for "python readline" you will get many more hits and suggestions on enhanced editing, tab completion, etc.
Have you tried?
myinput = raw_input("Enter your input ->")
I am using windows , it works fine. Don't have a linux to simulate.
Also, why are you pressing arrow keys? Is it a need for program?
You can simply make arrow using a dash and greater than keys.
I have recently started to learn Python 3 and have run into an issue while trying to learn how to debug using IDLE. I have created a basic program following a tutorial, which then explains how to use the debugger. However, I keep running into an issue while stepping through the code, which the tutorial does not explain (I have followed the instructions perfectly) nor does hours of searching on the internet. Basically if I step while already inside a function, usually following print() the debugger steps into pyshell.py, specifically, PyShell.py:1285: write() if i step out of pyshell, the debugger will simple step back in as soon as I try to move on, if this is repeated the step, go, etc buttons will grey out.
Any help will be greatly appreciated.
Thanks.
pyshell.py file opens during the debugging process when the function that is under review is found in Python's library - for example print() or input(). If you want to bypass this file/process click Over and it will step over this review of the function in Python's library.
In Python 3.4, I had the same problem. My tutorial is from Invent with Python by Al Sweigart, chapter 7.
New file editor windows such as pyshell.py and random.pyopen when built-in functions are called, such as input(), print(), random.randint(), etc. Then the STEP button starts stepping through the file it opened.
If you click OVER, you will have to click it several times, but if you click OUT, pyshell.py will close immediately and you'll be back in the original file you were trying to debug.
Also, I encountered problems confusing this one--the grayed-out buttons you mentioned--if I forgot to click in the shell and give input when the program asked. I tried Wing IDE and it didn't run the program correctly, although the program has no bugs. So I googled the problem, and there was no indication that IDLE is broken or useless.
Therefore, I kept trying till the OUT button in the IDLE debugger solved the problem.
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Closed 10 years ago.
Possible Duplicate:
Is there a way to detach matplotlib plots so that the computation can continue?
I use python with matplotlib for scientific programming. But whenever I use the command show() to display a plot, the script just stops there. I have to close the figure window for the script to continue executing. Is there a way to keep the script running while the figure window is open, just like in Matlab?
Sounds like there's only one thread running, and so the rest of your script can't continue until the show function returns, which won't happen until the figure is closed. Should be relatively simple to call that show function in a newly created thread, which would allow the rest of your script to keep running. I'd look into the threading python module.
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How to keep a Python script output window open?
(27 answers)
Closed 8 years ago.
I'm new to programming, especially Python. I'm trying to make an application that converts Fahrenheit to Celsius, but I don't know how to make the program stay open. Whenever it reaches the end of the code, it automatically closes before the user can see his or her results. I'm using Python 2.6.
Well, I guess you mean the terminal that Windows opens for you when you run a python file is closed too fast. You can add raw_input('Press Enter to exit') right before your program would exit. It tells Python to wait for input before exiting.
As the other people say, just ask for input to get it to hold. However, I would recommend running your Python scripts in a different manner in Windows. Using the IDLE IDE (should have come with your distribution), just open the script you want to run and press F5. Then, not only can you see the output for as long as you like, but you can also examine any variables that were assigned interactively. This is very handy especially when you are just starting to program in Python.
You can also run scripts from the command line, but I would recommend use IDLE if you're just starting out.
ask user to enter one more variable and print "Press enter to exit..."