Python3 pip module, check if packages exist on PyPi

Question

I use the pip module in a python script to automate the installation of software / modules . How can I do to check if the (remote) software / module exists? I have found nothing in the pip module that allows to do that.

My code :

class install_pip:
    def __init__(self):
        self._liste=['install']
    def install(self):
        pip.main(self._liste)
    def addsoftware(self, software):
        if type(software) is str:
            self._liste.append(software)
        if type(software) is list:
            for i in software:
                self._liste.append(i)
    def delsoftware(self, software):
        if type(software) is str:
            self._liste.remove(software)
        if type(software) is list:
            for i in software:
                self._liste.remove(i)
    def _return(self):
        return self._liste[1:len(self._liste)]
    list = property(_return)

I want check if 'software' exist. Thanks.

Edit: I tried this code:

try:
    pip.main(['install', 'nonexistentpackage'])
except pip.InstallationError as err:
    print(echec)

But I dont get any error...

HiFile.app - best file manager · Accepted Answer · 2017-01-03 22:01:43Z

3

I would do this:

import requests
response = requests.get("http://pypi.python.org/pypi/{}/json"
                        .format(module_name))
if response.status_code == 200:
    # OK, the json document exists so you can
    # parse the module details if you want
    # by using data = response.json()
    #
    # anyway, here you know that the module exists!
    ...

edited Jan 3, 2017 at 22:01

answered Jan 3, 2017 at 17:44

HiFile.app - best file manager

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Comments

structure · Accepted Answer · 2022-05-26 14:40:06Z

0

I realize this is an old question, but this works for me.

from importlib import util

found = True if util.find_spec('packagename') is not None else False
if found:
    import packagename
else:
    pip.main(['install', packagename])
    import packagename

answered May 26, 2022 at 14:40

structure

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Comments

井上智文 · Accepted Answer · 2022-09-04 00:49:17Z

0

async function check() {
  const packages = document.querySelector('textarea').value.split('\n')
  const settled = await Promise.allSettled(packages.map(n=>fetch(`https://pypi.org/pypi/${n}/json`, {method: 'HEAD'})))
  document.all.output.innerHTML = settled.map((s, i) => s.status === 'fulfilled' ? `<font color="green"><b>${packages[i]}</b></font>` : packages[i]).join('\n')
}
check()

<textarea oninput="check()" rows="5">requests&#10;nonexistentpackage</textarea>
<pre id=output></pre>

answered Sep 4, 2022 at 0:49

井上智文

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Comments

Jaxian · Accepted Answer · 2016-07-02 10:07:10Z

-2

The following code will attempt to import a package (package is of type 'str'). If it is unable to import the package (i.e. it isn't installed) it will call Pip and attempt to install the package.

import pip

def import_or_install(package):
    try:
        __import__(package)
        print (package, "exists, and was successfully imported.")
    except ImportError:
        pip.main(['install', package])

import_or_install("name of package")

edited Jul 2, 2016 at 10:07

answered Jul 2, 2016 at 10:01

Jaxian

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1 Comment

Daudré-Vignier Charles Over a year ago

Thank but that does not test if the remote package exists, is there a Pythonic way to access the cache of installable software ?

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