how to check something eg java, php, program etc installed with python?

Question

im makeing something like a check system before run so it meets the requirements with python. heres my code so far;

def checksystem():
    installednode = os.popen('node ' + srctocoffeecompiler + ' -v')
    // version 1.1.1
    print installednode.read()

i can print the version but is there a better way to check its installed with a version higher then 1.0.x ? heres my code so far to do this.

version = installednode.read()
if installednode.read() == 'CoffeeScript version 1.1.1':
    // the code
    // or split the string with space then get the last array
    // check if its more then 1.1.1 or 111 ( dots removed )

*edit ive read the docs about useing subprocess.Popen, that is maybe better, not sure. im still geting errors no such file exist.

*edit2

pn = subprocess.Popen(['node','-v'], stdout = subprocess.PIPE, stdin = subprocess.PIPE, stderr = subprocess.PIPE)
print "NodeJS version: " + pn.read()

ok, somehow i can call it, but i cant read its output return, same with java

pj = subprocess.Popen(['java','-version'], stdout = subprocess.PIPE, stdin = subprocess.PIPE, stderr = subprocess.PIPE)
print "JAVA: " + pj.read()

thanks!

Fabian · Accepted Answer · 2011-08-05 07:57:30Z

1

I would split the version string, the comparison is pretty simple if you use lists:

>>> vers1 = '1.0.1'.split('.')
>>> vers2 = '1.0.0'.split('.')
>>> vers1
['1', '0', '1']
>>> vers2
['1', '0', '0']
>>> vers1 > vers2
True
>>> vers2 > vers1
False
>>>

Here's a JavaScript alternative:

>>> var vers1 = "1.0.1".split('.');
>>> var vers2 = "1.0.0".split('.');
>>> vers1
["1", "0", "1"]
>>> vers2
["1", "0", "0"]
>>> vers1 > vers2
true
>>> vers2 > vers1
false

It's pretty much the same ;-)

answered Aug 5, 2011 at 7:57

Fabian

4,3481 gold badge22 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

Adam Ramadhan Over a year ago

python is really showing off. :D thanks, i never know we can do this well not in php without a function i guess.

Adam Ramadhan Over a year ago

well im still haveing a problem returning rather then outputing the -v, it should be returned to installednode so there is nothing on the screen, instead it will be in installednode = 'CoffeeScript version 1.1.1'

Fabian Over a year ago

Which Python version do you use? os.popen() is deprecated. You should use subprocess.

Adam Ramadhan Over a year ago

updated, yup im using it right now, new problems, i cant even get the return version.

Fabian Over a year ago

subprocess.Popen(['java','-version'], stdout = subprocess.PIPE, stdin = subprocess.PIPE, stderr = subprocess.PIPE).stderr.read()

|

Collectives™ on Stack Overflow

how to check something eg java, php, program etc installed with python?

1 Answer 1

6 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

6 Comments

Your Answer

Sign up or log in

Post as a guest

Related