[Tutor] Using pip
I just downloaded Python to work on a project at work. I'm writing a pretty simple program for data collection for an experiment. In order to get the data, though I need to install PyVISA. The website for PyVISA says I can install the library using the line: $ pip install -U pyvisa When I type this line, I get a syntax error for using the $, and when I remove the $, I get a syntax error for using the word install. I even tried just using the word pip and an error said 'pip' is not defined. I'm not sure if I'm not using some syntax wrong, or if its a completely different issue. Thanks for any help and insight Matt Hlavin ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Using pip
On 05/07/18 17:03, Hlavin, Matthew (GSFC-5460)[GSFC INTERNS] wrote: > install the library using the line: > $ pip install -U pyvisa > When I type this line, I get a syntax error The most common reason is that you are trying to type it at the Python >>> prompt. It should be typed at the OS prompt. The $ is the traditional *nix prompt. In Windows it will be something like C:\WINDOWS> It's not at all obvious that pip is an OS level tool, they need to improve/clarify the docs to make that clear - as does every site that uses pip! Its a very common error. HTH -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Using pip
On Thu, Jul 5, 2018 at 12:55 PM Hlavin, Matthew (GSFC-5460)[GSFC INTERNS] < matthew.hla...@nasa.gov> wrote: > I just downloaded Python to work on a project at work. I'm writing a > pretty simple program for data collection for an experiment. In order to > get the data, though I need to install PyVISA. The website for PyVISA says > I can install the library using the line: > $ pip install -U pyvisa > When I type this line, I get a syntax error for using the $, and when I > remove the $, I get a syntax error for using the word install. I even tried > just using the word pip and an error said 'pip' is not defined. I'm not > sure if I'm not using some syntax wrong, or if its a completely different > issue. > > Thanks for any help and insight > Matt Hlavin > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor What version of Python did you install and what operating system are you using? the $ is just a command prompt and it isn't used for the above command. The important bit from your message is the "I even tried just using the word pip and an error said 'pip' is not defined". This means either A.) You have pip installed, but it's not on your path or B.) You don't have pip installed. If you installed latest python (which is 3.7), then you can can create a virtual env directly and just use that, which contains pip as well. (this all assumes that python is on your path already) python -m venv env this will create a virtual environment called "env". After you create your virtual environment, you activate it ". env/bin/activate". If you are windows it would be "env\Scripts\activate" Once activated, you can install your package like: pip install pyvisa you may also enjoy using ipython (pip install ipython) for this kind of use case. James ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Using pip
On 07/05/2018 11:03 AM, Hlavin, Matthew (GSFC-5460)[GSFC INTERNS] wrote: I just downloaded Python to work on a project at work. I'm writing a pretty simple program for data collection for an experiment. In order to get the data, though I need to install PyVISA. The website for PyVISA says I can install the library using the line: $ pip install -U pyvisa When I type this line, I get a syntax error for using the $, and when I remove the $, I get a syntax error for using the word install. I even tried just using the word pip and an error said 'pip' is not defined. I'm not sure if I'm not using some syntax wrong, or if its a completely different issue. Thanks for any help and insight Matt Hlavin It sounds like you are trying to install it from inside python. First make sure that pip is installed on your OS. Then install PyVISA from your commandline/terminal (which ever your OS provides). Also depending on which version of python you are using (2 or 3) you may have to type pip3 instead of just pip. regards, Jim ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Using pip
On 07/05/2018 11:11 AM, James Reynolds wrote: > On Thu, Jul 5, 2018 at 12:55 PM Hlavin, Matthew (GSFC-5460)[GSFC INTERNS] < > matthew.hla...@nasa.gov> wrote: > >> I just downloaded Python to work on a project at work. I'm writing a >> pretty simple program for data collection for an experiment. In order to >> get the data, though I need to install PyVISA. The website for PyVISA says >> I can install the library using the line: >> $ pip install -U pyvisa >> When I type this line, I get a syntax error for using the $, and when I >> remove the $, I get a syntax error for using the word install. I even tried >> just using the word pip and an error said 'pip' is not defined. I'm not >> sure if I'm not using some syntax wrong, or if its a completely different >> issue. These days, it is suggested not to use pip as if it were a command by itself, but as a module. This is because many systems have more than one python version installed, and it's not clear if you'll get the version of pip that matches the version of python you'll be using. To make that more simple, suggest using **at a command prompt** as others have said: python -m pip install -U pyvisa rather than pip install -U pyvisa If you are using Windows, even if you've added python to your PATH, pip may not be in the path, as it lives in the scripts subdirectory of the place python was installed. This is another reason the "python -m pip" way of calling may be easier to deal with. Virtualenv instructions below are good by the way, as it's usually not a great idea to install into "system locations" with pip. That's actually what the "-U" in the invocation above is for - it means to not install the new module in the system paths, but in a user-specific path. > What version of Python did you install and what operating system are you > using? > > the $ is just a command prompt and it isn't used for the above command. > > The important bit from your message is the "I even tried just using the > word pip and an error said 'pip' is not defined". > > This means either A.) You have pip installed, but it's not on your path or > B.) You don't have pip installed. > > If you installed latest python (which is 3.7), then you can can create a > virtual env directly and just use that, which contains pip as well. > > (this all assumes that python is on your path already) > > python -m venv env > > this will create a virtual environment called "env". > > After you create your virtual environment, you activate it ". > env/bin/activate". If you are windows it would be "env\Scripts\activate" > > Once activated, you can install your package like: pip install pyvisa > > you may also enjoy using ipython (pip install ipython) for this kind of use > case. > > James > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Using pip
On Thu, Jul 05, 2018 at 04:03:00PM +, Hlavin, Matthew (GSFC-5460)[GSFC INTERNS] wrote: > I just downloaded Python to work on a project at work. I'm writing a > pretty simple program for data collection for an experiment. In order > to get the data, though I need to install PyVISA. The website for > PyVISA says I can install the library using the line: > > $ pip install -U pyvisa > > When I type this line, I get a syntax error for using the $, and when > I remove the $, I get a syntax error for using the word install. I > even tried just using the word pip and an error said 'pip' is not > defined. I'm not sure if I'm not using some syntax wrong, or if its a > completely different issue. My crystal ball tells me you're using the Python interactive intepreter :-) (By the way, in the future, please always copy and paste the full error messages you see. Don't use a screen shot.) Does the line start with a prompt >>> ? Then you're already running inside Python. The above command is assumed to be inside a Linux "bash" shell. Type Ctrl-D or enter the command "quit()" (with the parentheses, but not the quotes) to exit. The command "exit()" will also work. This should return you to the standard terminal shell, which on Linux is probably bash. You should see a $ (dollar sign) prompt. If you do, then you can try running: pip install -U pyvisa at the dollar sign prompt (don't retype the $) but don't be surprised if it fails again. pip is a great tool, *once you get it working right*, but getting it working is often a dozen kinds of pain. If it works, GREAT! But if you get an error, please copy and paste all the output and we'll see what we can see. All of the above assume you are running Linux. If you're on Windows, the commands needed will be slightly different. Let's start with: - what OS are you running? Windows, Linux, Mac OS, something else? - do you have sudo/root/Administrator privileges on that machine? - what version of Python are you running? - what command or action do you use to start Python? If you're running Linux or Mac OS, you can also run this command at the dollar sign $ prompt: which pip and see what it says. -- Steve ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
