I've got 10+ years in C/C++, and it appears Visual Studio has spoilt me during that time. In Visual Studio, debbuging issimple: I just add a breakpoint to a line of code, and as soon as that code is executed, my breakpoint triggers, at which point I can view a callstack, local/member variables, etc.
I'm trying to achieve this functionality under App Engine. I assume that is possible?
All the searching I've done to this point has led me to using Pydev in Eclipse. As best I can tell, I am successfully launching my simple 'hello world' program in Debug mode.
But the IDE doesn't even seem to have an option to set a breakpoint? I must be missing something.
I've googled long and hard about this, but am having no luck. Most results trace back to the same old threads that don't deal directly with my issue.
Can anyone shed some light on how you get basic debugging setup using Pydev/Eclipse with App Engine?
Alternatively, if there's an easier way to debug App Engine than using Pydev/Eclipse, I'd love to hear about it.
Thanks in advance.
In fact setting a breakpoint in eclipse is very easy. You have two options:
In the grey area next to your line numbers, doubleclick or right mouseclick -> toggle breakpoint.
Related
I am not able to click(I can say it's diabled) step in, step out, step over option in pycharm debugger
I don't know if this is exactly what is causing your issues but here is one possibility:
All debugging options are grayed out in the menu if your cursor is on an empty line or a line that is a comment. Try putting your cursor on an actual line with code. The "Toggle Line Breakpoint" option in the "Run" menu should now become active. After starting the script with "Run -> Debug", the breakpoint will be triggered (assuming the code reaches it) and the other debug options such as "Step over" become available.
As mentioned in this answer: https://stackoverflow.com/a/48665161/2891209
Depending on what you're trying to debug it is possible for step-in to not show you code which isn't pure python. Pycharm will do the best it can of course, but if the function you're trying to debug isn't native python be prepared for anything...
If you're trying to step into a python wrapped C library function
Sometimes the debugger will skip over that code completely.
Sometimes you can walk the frames but the editor can't show you lines of code.
Sometimes you'll be able to step into an empty skeleton of a function.
It really depends on how the library was created.
Is there something special I need to debug in Pycharm?
I have the following code:
def main():
print "Hello World"
if __name__ == "__main__":
main()
and I have breakpoints on each. I hit Debug and it gives me some windows and prints both lines even though I have breakpoints on each. Is there any kind of indicator when a breakpoint is hit?
I have seen in other posts something about how you must setup your configuration first? But none of the posts seem to mention how. Here is my configuration
Please do not link me here: https://www.jetbrains.com/pycharm/help/debugging.html I have read it and do not understand what I need to do. I keep getting reffered to lines such as:
In the Project Structure dialog box, configure the roots, dependencies
and libraries to be passed to the interpreter .
I am new to python and am not sure what I should be inputting into the boxes.
So my question is really.
Is Pycharm supposed to debug python out of the box?
How do I setup Pycharm to debug python if not.
I am using the latest python 2.7.9 a fresh install of a few minutes ago.
You set breakpoints in the gutter by clicking a wee bit to the right of the line numbers (if visible)...
...and run under the "Debug" context (it's the green icon that looks like a bug of some kind).
Well it turns out I am just a idiot. Though I have seen people in the debug menu complaining about the same problem.
You are debugging. The breakpoint does not change to indicate you have hit that line like visual studio. Instead one of your lines will change a light blue (depending on your theme) to indicate you are debugging that line.
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.
Hi all Python developers!
In Eclipse with PyDev it is possible to edit a Python file while debugging. On save, the PyDev debugger will reload the updated code into the running program and uses my new code. How can I do the same thing in JetBrains PyCharm (using Community Edition)?
Eclipse / PyDev writes an output like this when I do that:
pydev debugger: Start reloading module: "MyWidget" ...
pydev debugger: Updated function code: <function close at 0x055F4E70>
pydev debugger: reload finished
I searched settings and web and could not find any hint. Very glad about any idea. Thx.
Edit: I found out in Eclipse/PyDev one has to be in debug mode to be able to use this feature. I tested in PyCharm, but there was no reload done.
PyCharm does not support edit and continue in either the community edition or the professional edition but here is a workaround that I have found while debugging.
Since you can run arbitrary code in the console and/or the expression evaluator, in a lot of cases, you can execute changes to the code without having to restart the application. This isn't exactly like edit-and-continue (which is a feature I really like in Visual Studio and should be part of Pycharm) but it goes a long way towards avoiding having to restart the program from scratch after a change to see if the new code works as expected.
Let me illustrate a couple of the techniques I use:
Let's say you have the following code (with a couple of typos/bugs to illustrate the techniques)
test_value = [10,9,8,7,6,55,4,3,2,1]
for i in range(0,10):
if test_value[i] == i:
print "found the value: " + i
If you run this code, first it errors because you can't print string plus integer but also I wanted to match on 5, not have 55 in the array. So here we go.
Set a break point on the for statement like this and run the code in the debugger.
When it breaks into the debugger, you realize that it should be 5 not 55. Rather than restarting, you can change line 1 to test_value = [10,9,8,7,6,5,4,3,2,1] then select the line, right click and choose Execute Line in Console... which will change the value of test_value to be the array with a 5. Now, the if statement on line 4 becomes true on the value 5. This will then trigger the syntax error on line 5.
Now if you want to make sure you have the syntax correct you can change line 5 to print "found the value: " + str(i), select the line and choose Evaluate Expression... from the right button context menu. When you click Evaluate, the result will show up either in the dialog (or in this case, since it is a print command, in the console)
Now that I've fixed these two issues, I can run the code successfully on the second pass rather than possibly multiple passes it might have taken if I didn't use these techniques. These techniques really pay off if you find a bug deep in the code where it took a while to set up.
Obviously, this is a very contrived example, but hopefully this shows how you can use both Evaluate Expression... and Execute Line in Console... to your advantage while debugging without having to restart your application each time you find a bug in the code.
Also, if you happen to be using Django, PyCharm (professional) will re-launch the server if you make changes to the code. So if you are looking at your web page and notice a problem, you can make a change to the code and switch back to the web page and as you do, either the running application or the debugged application will re-launch and the new code will be running when you refresh the page. Again, not really edit-and-continue but a pretty rapid way to make a change and test.
After all I found a useful and acceptable workaround for my question. It works in PyCharm Community Edition 3.1.2 and I assume it will do in commercial edition as well. I tested on a mid-scale project using Python 2.7.6, PySide (Qt) with one main window and 20+ widgets, tabs, whatever. Follow these steps...
Work in PyCharm on a python project :-)
Execute your code in Debug mode (did not tried Release so far)
Edit some code in one your modules imported during the life of your program
Make your program pause. To achieve this, you can click the "Pause" button of in PyCharms Debug view and then any place in your applications main window where it would need to do something (for example on a tab header). If you have a long a running task and no UI, you may place a breakpoint in a place your program often comes by.
In the Debug view, switch to the Console tab. There is a button on the left Show command line. Click this.
In the console, type in reload(MyModifiedModule) if this call fails, write import MyModifiedModule and try again.
Click resume in PyCharm.
Try the code you fixed.
There are some restrictions on this... It won't fix changes in your main method or main window, cause it won't be created again. In my tests I could not reload widgets from Qt. But it worked for classes like data containers or workers.
May the force be with you as you try this and do not hesitate to add your experiences.
I have the commercial version of PyCharm and just tried testing a simple python script. The script is the following:
for i in range(0,100):
print i
I ran the code in debug mode and placed a break point at the "print i" statement. When the debugger stopped during the first iteration I changed the code to look like this:
for i in range(0,100):
print i
print 'hello'
PyCharm did not reload/re-compile the altered script. Given this simple test my best guess would be that PyCharm does not dynamically reload .py files.
You can add hot reloading features by installing Reloadium plugin.
https://plugins.jetbrains.com/plugin/18509-reloadium
Example use (gif)
It also works without pycharm.
More details:
https://github.com/reloadware/reloadium
I am very much concerned about my productivity all the time. I have recently come across this beautiful chrome extension Limitless
But this is only measuring what i'm doing within the chrome application. As I work most of the time with pdfs, videos etc, I want to develop similar application for linux(ubuntu) desktop enviroment.
Basically I want the script to run continuously as long as the workstation is on.
It should be able to know what I'm currently looking at (for eg a pdf file or a lecture video in vlc) and get the name of the respective file, start time, end times etc and finally post to db.
It is better if it could know if the system is idle or at sleep.
I don't have slightest clue at bash scripting. so my questions is could this task be accomplished with python.
What I've tried?
I started with a search in google "get current application python", "current window title python" etc etc and really surprised to see absurd results.
Please give me pointers on this.
I think you are asking for vocabulary. So I give you what I know.
You are using Ubuntu so your Window Manager may be Gnome.
The window manager knows which window has the focus.
So maybe you want to find out which window has the focus and you want to map it to the Process that opened the window.
What you need to focus on is is module for Python or a Python Binding for the window manager. This module is likely to also be able to control the windows.
The window manager is started with startx.
You could try to call a command line tool and catch the results
How do get the process list on command line:
https://stackoverflow.com/questions/53489/how-do-you-list-all-processes-on-the-command-line-in-windows
And how to call a tool with python:
Python subprocess.call and subprocess.Popen stdout
[edit] Repeating the call in Intervals and counting the intervals a process were running gives you a good estimation of running time of a process...
[edit2] As GreenAsJade said, you search a way to find out which windows has the focus.
See How do I detect the currently focused application?