Search results
Jun 19, 2020 · The sys includes "functions + variable " to help you control and change the python environment @runtime. Some examples of this control includes: 1- using other sources data as input via using: sys.stdin 2- using data in the other resources via using: sys.stdout 3- writing errors when an exception happens, automatically in : sys.stderr
sys.arg is a list of command line parameters. You need to actually pass command line parameters to the script to populate this list. Do this either in your IDE's project settings or by running like this on the command line: python script.py first second third Note that the first argument is always the script's name (python script.py in
The problem is that if I use sys.path.append(mod_directory) to append the path and then open the python interpreter, the directory mod_directory gets added to the end of the list sys.path. If I export the PYTHONPATH variable before opening the python interpreter, the directory gets added to the start of the list. In the latter case I can import ...
Dec 29, 2011 · Create a wrapper module project/bin/lib, which contains this: import sys, os sys.path.insert(0, os.path.join( os.path.dirname(os.path.dirname(os.path.realpath(__file__))), 'lib')) import mylib del sys.path[0], sys, os Then you can replace all the cruft at the top of your scripts with: #!/usr/bin/python from lib import mylib
Also, Python lets you reference a slice of a list, so to get another list of just the user-supplied arguments (but without the script name), you can do. user_args = sys.argv[1:] # get everything after the script name Additionally, Python allows you to assign a sequence of items (including lists) to variable names.
import subprocess import sys # Some code here pid = subprocess.Popen([sys.executable, "longtask.py"]) # Call subprocess # Some more code here The idea here is that you do not want to wait in the line 'call subprocess' until the longtask.py is finished. But it is not clear what happens after the line 'some more code here' from the example.
Feb 1, 2013 · You may check it here in the python 2.7 doc: The optional argument arg can be an integer giving the exit status (defaulting to zero), or another type of object. If it is an integer, zero is considered “successful termination” and any nonzero value is considered “abnormal termination” by shells and the like.
Apr 3, 2009 · Evidently Python returns a cached version of a module with the same name instead of actually checking the sys.path for a module matching that name. sys.path in this case was being altered correctly, Python was just not checking it due to the same-named module already having been loaded. –
import sys Y = reload(sys.modules["X"]).Y # reload() returns the new module In fact, doing import X creates a new symbol ( X ) that might be redefined in the code that follows, which is unnecessary (whereas sys is a common module, so this should not happen).
Jul 21, 2022 · Is sys.modules shared by the whole Python process. With caveats, yes. Every module that does import sys in a global scope will (unless, for some reason, it finds a different sys from the standard library module; or unless it overwrites the name sys with something else; or unless it dels the name; or...) have a global name sys which refers to the same module object for the sys module.
