I have a Python script that has a fair amount of print statements.
Is there a way for me, in my script, to specify the output of the function as a pipe into less?
One of the ways I thought to do it was by starting up less as a subprocess, getting it's file descriptor, and changing the stdout to feed into the less subprocess. Is that the right way, or is there an easier way to do so?
Note that this question is out of pure laziness :) - I don't want to have to manually pipe it to less, and this script is hosted on more than one machine, so I can't alias it easily
Okay, so one possible way to solve this is to print to a file. Since you are on python 2.7 you will have to from __future__ import print_function. You can then follow the docs in order to route all output to elsewhere. After that, you can use this file as an arg for a subprocess.call() to less.
Related
Suppose I have a database with file names and I would like add file modification dates and times to this database. Is it possible to do it in Stata in a straightforward way?
I can think of two non-straightforward ways:
1) Writing a plugin in C or Java.
2) Using dir command, capturing the output in a log file, and then importing that log file back.
But is there a less cumbersome solution?
There does not seem to be either a Stata or a Mata function that is of any help. I realize that I can easily do it in any scripting language and then import the results into Stata but I would like to know if there is a purely Stata solution (for portability reasons).
I think you can do that using the shell capabilities of Stata.
See here:
http://www.stata.com/help.cgi?shell
I'm a new Python user. I've been trying to get a setup script to work -- unsuccessfully. What I have found is that, while simply importing the script returns a fatal error, I can rewrite it line by line in real-time. Every time I make an error or typo, Python kicks me out of the continuing '...' edit mode and into '>>>' mode which, with my limited knowledge means that I have to start all over. The problem is that one function passes more than 100 lines of code. If I get an error in the middle, at this stage of my knowledge, I have to begin it again.
Is there some way to pick the function writing back up where I left off, before the typo?
If you use python IDLE (or any other IDE...there are tons of them listed here), you will have what's called a REPL (read-evaluate-print-loop) that will make your life much easier! You can select just a small part of your code, run it, see its effects, make edits, re-run it, run the next part, etc.
I'm using a complicated python module called CAMFR. In one function, it calculates a value that I want to use (to plot or otherwise), but unfortunately the module prints this value to the python console but doesn't return it as a variable!
(I have poked through the source code to see if I can recompile the module to return the values, but this looks excessively difficult at my programming level, considering it's written in C++ and uses Boost etc. I just don't get it unfortunately.)
SO, option number two is to grab the text printed to the console and parse out the value I need.
How can I intercept or otherwise acquire this function's console output text in Python (2.7)? (I will RegEx it afterwards.)
Thanks!
Here is an example of the text printed to the Python console:
<<a lot of other output, and then at the end of the function:>>
...
# 1.05554 4.65843e-05 5.54592 0.0903205 1
# 1.05554 2.87907e-05 3.42757 0.0903205 1
# 1.05554 2.87907e-05 3.42757 0.0903205 1
Done pass 1: lambda 1.05554, gain 3.42757
I ultimately want to grab the Lambda=1.05544 & Gain=3.42757 values, for example, and shove them into variables. Grabbing the entire console output of this one function would allow me to do that via a subsequent RegEx search, so I'm looking for a way to do that.
I apologize if there is another thread with the answer I need, I could not figure out google search terms that got me what I needed. Thanks for your patience & generous help!
I am new to python and wxpython, I am making a automated tool using python and for user interface wxpython and i use shell script.shell script can be called from the python. but now I am facing problem with the spinctrl value. whenever that spinctrl value changes it have to send that value into one txt.exe file which is written in BASH .{ if we run txt.exe file in command line it will ask for number then it will accept that value whenever we press enter}. but i am not able to understand that how to send value from spinctrl to txt.exe whenever i press "ok" button in GUI. please share your thoughts and knowledge.
Thank you
To call an executable in Python, you need to look at Python's subprocess module: http://docs.python.org/2/library/subprocess.html
If your exe doesn't accept arguments, then it won't work. If you created the exe yourself using something like PyInstaller or py2Exe, then you need to make it so your app can accept arguments. The simplest way is using sys.argv, but there are also the optparse and argparse libraries in Python as well.
I do not get a good feeling about your concept. It is hard to say, but I suspect you would benefit from talking with someone experienced about what you are trying to achieve and how it could best be done.
However, to get you started down your current path, I think you should take a look at wxExecute ( http://docs.wxwidgets.org/2.8/wx_processfunctions.html#wxexecute ). This will allow you to run your txt.exe utility from inside your GUI.
wxExecute is a wxWidgets utility. If you are working in python then there will be a more direct way to do this using a python utility - some-one else will have to advise on that. I suggest you edit your question for clarity so a python expert can help you.
I'm working on a project simulating a stock market. People buy and sell a stock and I would like to call each turn a script to try a strategy against the market.
What I want is a function in C++ which send an vector of integer as argument to a vba or python script which return an array of 3 integers.
I've searched for a solution but all i could find is a way to execute a script in python, but I don't know how I can send and get an argument from this script.
I think my problem is common but i don't know where to head to find a solution.
Thank you!
(I'm not a native english speaker so sorry if I made grammar error)
On windows you use the function CreateProcess() to start another program. Use the full path of the python interpreter as the first argument. Start the second argument with the path to the python script.
If you can fit a string representing your vector in 32768 characters, you can supply the vector in the second argument to CreateProcess.
A more flexible option is create a child process with redirected in- and output, as shown here. You can then write the vector to the standard input of the python process and read the answer back from its standard output.
There are many ways to do this.
The way I would do it is to popen() your "script" [which would be something like "python myscript.py -arg1 -arg2"]. Depending on how large your vector is, you could either store it in a file or pass it as part of the arguments [there is a limit in Windows of something like 8KB for the argument string].
The output would then appear as the result from popen()'s pipe.
Use Boost.Python. It will help you to embed python in your app.