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Install python module from within script

AnthonyCheesman1

I've got a small project that I'm working on that requires installation of the dropbox Python library, as the script needs to a write files to it.

Ideally I'm going to deploy this to a number of users either via a toolbox or a Python add-in.

The catch is that dropbox is not a standard module, and at Python 2.7.5, pip (which I would normally use to install new module) is not a standard module either.

What I'm wondering is:

1/ how would I programatically go about installing a new module from inside a running script; or

2/ is there a way I can bundle the module either into my code, or as part of my code package ('bundle of files') so that the script can find and install the missing module?

3/ I posted a similar question on Reddit and it was suggested that I look at 'freezing' my code (effectively convert to an .exe) - but I'm unsure whether this will allow the script to interact with the toolbox to access parameters etc. Would compiling the code to a .pyc allow this to work?

Any and all help gratefully received!

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Accepted answers

Luke_Pinner

Just the dropbox directory. You'll also need the urllib3 and requests directories and six.py file as they're 3rd party libraries required by dropbox, see the "Requires Distributions" section in dropbox 6.4.0 : Python Package Index

All comments

AnthonyCheesman1

For those still interested in this - Dropbox has now upgraded it's API to v2. This has meant updating the module install (no problems there).

AnthonyCheesman1

Paul, can't give you a definitive answer on that other than I think it's one of the dependencies - which I found out when I got an error message of the effect of pip not being available. Once I dropped the pip directory in the same folder, it worked.

Whether or not it needs the whole module or not I don't know - but I'm putting this in the category of 'it's working - I don't know why - but I won't mess with it any more'.

PaulDavidson1

Just curious, why did you need pip if you weren't installing any externals?

Just setting it up for future maybes?

AnthonyCheesman1

I think for portability and ease of use, I prefer the add-in option. The ability to deploy and install a single .addin file beats the pants off trying to manage the location of multiple files (especially when multiple users of varying technical abilities are involved). Add-in gives the option of the tool being run disconnected from our internal network as well.

If I'm really smart, I can add it as an additional tool to a python .addin toolbar I'm already using.

Could be a good tinkering job for this weekend.

Luke_Pinner

You don't need to put everything in a python add-in (unless you want to of course...). You can still have all the supporting modules in a single folder.

How would you prefer to run your script? As a toolbox tool or an addin?

AnthonyCheesman1

Postscript to this:

I have tested Luke's proposed fix and it works.

There were a couple of additional bits and bobs to copy in to get it to run, but I now have a script that is happily functioning on a clean install machine without have any external dependencies, which should also not cause any administrator type issues.

For future reference, I needed the following stored in the same folder as my .py file to get it functioning:

dropbox (folder)

pip (folder)

pkg_resources (folder) (note: duplicate as also inside pip folder)

requests

urllib3

Also six.py (file) (note:duplicated as also inside pip folder)

Huge thanks to Luke. As to packaging and making pretty, I think this is going to have to live inside a Python add-in toolbar, so all the modules etc are packaged together in one location to allow full portability.

AnthonyCheesman1

Fantastic! Thanks mate, you've saved me hours of chaos and confusion.

Luke_Pinner

AnthonyCheesman1

Thanks Luke - really good information to know.

At the risk of sounding like a complete dumb-arse - what installer files would I need to put in that location for the dropbox module to work? As I installed the module via pip from the command line, I'm not sure what files actually contribute to the library.

In my C:\Python27\Lib\site-packages folder, I have a /dropbox and /dropbox-6.3.0.dist-info folders - do these constitute the module as such?

Luke_Pinner

You can distribute it with your code, i.e as a 'bundle of files'. The directory your script is in is part of the module search path - 6. Modules — Python 2.7.11 documentation

So you would have something like:

some_dir

+-- your_script.py

+-- dropbox

You can also modify the search path at runtime, i.e with sys.path.append('path/to/folder/dropbox/is/in')

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