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subprocess gives an error. "The system cannot find the file specified"
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Closed 4 years ago.
I have subrpocess function to start a postgres table. But I'm getting a file path error
filepath = self.get_path(filename)
...
if not append:
# Create the new table itself without adding actual data.
print "this is the path {}\n\n".format(filepath)
print "does file exist".format(os.path.isfile(filepath))
create_table = subprocess.Popen(['shp2pgsql', '-p', '-I',
'-s', str(srid),
'-W', encoding,
filepath, table],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True)
this is the traceback I'm getting:
this is the path C:/Urbansims/inputs\geographies/cities.shp
does file exist? True
Traceback (most recent call last):
File "loading_data.py", line 117, in <module>
loader.load_shp_map({value["sql_in"]:"/".join(value["input"].rsplit("/",2)[1:]) for key,value in geo_inputs.iteritems()})
File "c:\urbansims\libs\spandex\spandex\io.py", line 416, in load_shp_map
self.load_shp(filename=value, table=table, drop=True)
File "c:\urbansims\libs\spandex\spandex\io.py", line 369, in load_shp
universal_newlines=True)
File "C:\Anaconda2\lib\subprocess.py", line 394, in __init__
errread, errwrite)
File "C:\Anaconda2\lib\subprocess.py", line 644, in _execute_child
startupinfo)
WindowsError: [Error 2] The system cannot find the file specified
the path exist and the os.find.path is returning a True for the location. Why cant the system find the path if it clearly is the correct path to the file?
You are using filepath as an argument to the shp2pgsql tool that you are trying to launch in a separate process. The error comes from shp2pgsql not being found.
Related
I'm getting this error when trying to run a Python script. Is it saying that it can't find subprocess.py? Because I found it in the location it's listing there, so I doubt that's the issue. What file can't it find?
Traceback (most recent call last):
File "D:\Projects\PythonMathPlots\MandelbrotVideoGenerator.py", line 201, in <module>
run( ['open', 'MandelbrotZoom.mp4'] )
File "C:\Users\Aaron\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 472, in run
with Popen(*popenargs, **kwargs) as process:
File "C:\Users\Aaron\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 775, in __init__
restore_signals, start_new_session)
File "C:\Users\Aaron\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 1178, in _execute_child
startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified
You may need to put the full path in the run(...) command, to the open file, and the path to the .mp4 file as well.
Most likely, open does not exist on your system and you have to use the name of the video player software instead.
Make sure the user you're running the script as has read permission for the file.
You may also try with subprocess.Popen(args, shell=True). The use of shell=True may be useful.
Also, use a path defined as path = os.path.join(filepath, filename) and then before passing the path to Popen, assert if os.path.exists(path)==True.
But note that there are some downsides to using shell=True:
Actual meaning of 'shell=True' in subprocess
https://medium.com/python-pandemonium/a-trap-of-shell-true-in-the-subprocess-module-6db7fc66cdfd
I am trying to follow this blog on how to execute an R script from Python. I have the R script working fine from the command line using Rscript.
Here's my Python code:
import subprocess
import os
command = "C:\Program Files\R\R-3.4.4\bin\Rscript"
path2script = os.getcwd() + "\max.R" # gives me the absolute path to the R script
args = ["11", "3", "9", "42"]
cmd = [command, path2script] + args
x = subprocess.check_output(cmd, universal_newlines = True)
Which gives me this error:
FileNotFoundError: [WinError 2] The system cannot find the file specified
I've read a lot of SO posts on this error and in most cases it seems to be a problem with trying to invoke system commands like dir or passing arguments to check_output in the wrong order but in my case I really don't see what should be going wrong.
Following some of the advice I've tried building a string for cmd instead of a list, and then passing it to check_output using the argument shell = True - when I do that I get a CalledProcessError: returned non-zero exit status 1.
I'm assuming this code, which is exactly as it appeared on the blog other than adding the absolute path to the file, is failing now because the behaviour of check_output has changed since 2015...
Can anyone help?
Here's the stack trace:
Traceback (most recent call last):
File "<ipython-input-2-3a0151808726>", line 1, in <module>
runfile('C:/Users/TomWagstaff/Documents/Raising IT/Projects/15 AdWords/Python_R_test/run_max.py', wdir='C:/Users/TomWagstaff/Documents/Raising IT/Projects/15 AdWords/Python_R_test')
File "C:\Users\TomWagstaff\Anaconda3\envs\adwords\lib\site-packages\spyder\utils\site\sitecustomize.py", line 705, in runfile
execfile(filename, namespace)
File "C:\Users\TomWagstaff\Anaconda3\envs\adwords\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "C:/Users/TomWagstaff/Documents/Raising IT/Projects/15 AdWords/Python_R_test/run_max.py", line 31, in <module>
x = subprocess.check_output(cmd, universal_newlines = True)
File "C:\Users\TomWagstaff\Anaconda3\envs\adwords\lib\subprocess.py", line 336, in check_output
**kwargs).stdout
File "C:\Users\TomWagstaff\Anaconda3\envs\adwords\lib\subprocess.py", line 403, in run
with Popen(*popenargs, **kwargs) as process:
File "C:\Users\TomWagstaff\Anaconda3\envs\adwords\lib\site-packages\spyder\utils\site\sitecustomize.py", line 210, in __init__
super(SubprocessPopen, self).__init__(*args, **kwargs)
File "C:\Users\TomWagstaff\Anaconda3\envs\adwords\lib\subprocess.py", line 709, in __init__
restore_signals, start_new_session)
File "C:\Users\TomWagstaff\Anaconda3\envs\adwords\lib\subprocess.py", line 997, in _execute_child
startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified
check that you have a right path for command and script
print(os.path.exists(command))
print(os.path.exists(path2script))
note that writing path with backslashes may be dangerous as you can create escape sequence that way which will be interpreted in different way. You can write windows paths with forward slashes and then call os.path.normpath on them, turning them into safe form
(also in command you can use forward slashes only, Python interpret doesn't really care. In path to your R script that would be probably problem though)
In my program I call the command:
command_two = 'sfit4Layer0.py -bv5 -fs'
subprocess.call(command_two.split(), shell=False)
I am using PyCharm and I get the error message:
Traceback (most recent call last):
File "part2test.py", line 5, in <module>
subprocess.call(command_two.split(), shell=False) #writes the summary file
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 522, in call
return Popen(*popenargs, **kwargs).wait()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 710, in __init__
errread, errwrite)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1335, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory
When walking through my program, it never gets to the program I want it to sfit4Layer0.py, it is getting stuck in subprocess but I am not sure why. Changing the shell=True doesn't do anything helpful either - I don't get these error messages but it does not execute my code properly. Any suggestions would be helpful.
My bash profile:
PATH="~/bin:/usr/bin:${PATH}"
export PATH PYTHONPATH="/Users/nataliekille/Documents/sfit4/pbin/Layer0:/Users/nataliekille/Documents/sfit4/pbin/Layer1:/Users/nataliekille/Documents/sfit4/pbin/ModLib:/Users/nataliekille/Documents/sfit4/SpectralDB"
export PYTHONPATH
PATH=${PATH}:${PYTHONPATH}
export PATH
You've missed an important part of the subprocess documentation. "If passing a single string [at the command, rather than a list of strings], either shell must be True (see below) or else the string must simply name the program to be executed without specifying any arguments."
So the kernel is compaining because there is not executable with the name 'sfit4Layer0.py -bv5 -fs'. Should work if you replace the string with (for example) 'sfit4Layer0.py -bv5 -fs'.split(), or ['sfit4Layer0.py', '-bv5', '-fs'].
i have a code running on python 2.7.3 (windows) and i try to run it on python 2.7.8(windows) and get the following error:
main : INFO ** Starting Main **
Traceback (most recent call last):
File "C:\wamp\www\prenderer\src\main.py", line 82, in <module>
nuke_process = launch_nuke()
File "C:\wamp\www\prenderer\src\main.py", line 31, in launch_nuke
query = subprocess.Popen(r"query process", stdout=subprocess.PIPE)
File "F:\python27\lib\subprocess.py", line 710, in __init__
errread, errwrite)
File "F:\python27\lib\subprocess.py", line 958, in _execute_child
startupinfo)
WindowsError: [Error 2] The system cannot find the file specified
>>>
what is wrong?
Pass shell=True argument:
query = subprocess.Popen(r"query process", stdout=subprocess.PIPE, shell=True)
or pass the command line argument as a list:
query = subprocess.Popen(["query", "process"], stdout=subprocess.PIPE)
Otherwise query process is recognized as a program instead of query.
I'm having issues with Python finding an available Executable on my Linux machine. My default PATH includes this Executable (svnlook) but when I run the python script the below function fails to find executable. Any ideas on how to fix this?
def command_output(cmd):
child = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
output = child.communicate()[0]
return output, child.returncode
def get_author():
cmd = "svnlook author %s %s %s" % (svn_opt, svn_txn, svn_repo)
author, return_code = command_output(cmd)
return author.strip()
Error:
Traceback (most recent call last):
File "/home/user/app/csvn/data/repositories/repo/hooks/pre-commit", line 82, in <module>
author = get_author()
File "/home/user/app/csvn/data/repositories/repo/hooks/pre-commit", line 53, in get_author
author, return_code = command_output(cmd)
File "/home/user/app/csvn/data/repositories/repo/hooks/pre-commit", line 36, in command_output
child = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
File "/home/user/app/activepython-2.7.2.5_x86_64/lib/python2.7/subprocess.py", line 679, in __init__
errread, errwrite)
File "/home/user/app/activepython-2.7.2.5_x86_64/lib/python2.7/subprocess.py", line 1228, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory
Error: [Errno 2] No such file or directory
You probably want to provide the full path to the executable, e.g. /usr/bin/svnlook or /usr/local/bin/svnlook instead of just svnlook.
See this answer to a related question for details.
Try running it from the console. Make sure the permissions/executability is correct. Try os.system().