how to check if i have installed python correct?

[apollo]

hello dear python-experts,

i am apollo - pretty new to python. i have installed python on my opensuse leap 42.3. box:

afterwards i have installed bs4 - see below.
note - i did this as root. Hopefully this is correct.

linux-3645:/home/martin # pip install --upgrade pip                                                                                                                                             
Collecting pip                                                                                                                                                                                  
  Downloading pip-9.0.1-py2.py3-none-any.whl (1.3MB)                                                                                                                                            
    100% |████████████████████████████████| 1.3MB 155kB/s 
Installing collected packages: pip                                                                                                                                                              
  Found existing installation: pip 7.1.2                                                                                                                                                        
    Uninstalling pip-7.1.2:                                                                                                                                                                     
      Successfully uninstalled pip-7.1.2                                                                                                                                                        
Successfully installed pip-9.0.1                                                                                                                                                                
linux-3645:/home/martin # pip install beautifulsoup4
Collecting beautifulsoup4                                                                                                                                                                       
  Downloading beautifulsoup4-4.6.0-py3-none-any.whl (86kB)
    100% |████████████████████████████████| 92kB 394kB/s 
Installing collected packages: beautifulsoup4
Successfully installed beautifulsoup4-4.6.0
linux-3645:/home/martin # 

To test if all went all right i tried the following:

import urllib
from bs4 import BeautifulSoup
import urlparse
import mechanize


# Set the startingpoint for the spider and initialize 
# the a mechanize browser object
url = "http://sparkbrowser.com"
br = mechanize.Browser()

# create lists for the urls in que and visited urls
urls = [url]
visited = [url]


# Since the amount of urls in the list is dynamic
#   we just let the spider go until some last url didn't
#   have new ones on the webpage
while len(urls)>0:
    try:
        br.open(urls[0])
        urls.pop(0)
        for link in br.links():
            newurl =  urlparse.urljoin(link.base_url,link.url)
            #print newurl
            if newurl not in visited and url in newurl:
                visited.append(newurl)
                urls.append(newurl)
                print newurl
    except:
        print "error"
        urls.pop(0)
       

i get the following lines back

martin@linux-3645:~/dev/python> python p1.py
Traceback (most recent call last):
File "p1.py", line 3, in <module>
from bs4 import BeautifulSoup
ImportError: No module named bs4
martin@linux-3645:~/dev/python> 

sure thing - the above mentioned code is version 2 based.

but i guess that i have done some kind of misconfiguration in the installation of python?!?

probably i have choosen some wrong paths...

love to hear from you

[sparkz_alot]

Try using pip3 install ... . Since opensuse comes with Python 2 and Python 3 preinstalled, you you need to specify which version you are using. If you you installed an additional Python version, (say 3.6.3) you need to reference that, for example pip3.6 install ...

[apollo]

hello dear - sparkz - alot,

many thanks - i runned a final test - now i am going to to what you adviced. Many thanks again

martin@linux-3645:~/dev/python>  python3 p1.py
  File "p1.py", line 31
    print newurl
               ^
SyntaxError: Missing parentheses in call to 'print'
martin@linux-3645:~/dev/python>

how to check and make sure what is going on on the machine!?

[j.crater]

apollo, there is a change in how print is used in Python 3 as compared to Python 2. Here is a quick summary.
print newurl is for Python 2, so you will need to change that to:
print(newurl). Same with other print statement you have.

[apollo]

hello dear J crater

many thanks for the heads up and the tipps regarding the difference of Python 2 and 3. I appreciatate this:

one word regarding the system i run here:


1. i have installed a pip package as user when it would most efficiently be done using a prebuilt RPM as root.
2. i thougt that i were using Python 3 - but in fact there is Python 2 (the openSUSE default).


but wait: I have installed Eric verison 5 on my openSuse version 42.3:

and if i open eric i see the following

Python 3.4.6 (default, Mar 22 2017, 12:26:13) [GCC] auf linux-3645, Standard>