Parse output of pip list / pip freeze in python

Question

Hello I have a string like this:

AdvancedHTMLParser (8.0.1)\nappdirs (1.4.3)\nbeautifulsoup4 (4.6.0)\nchardet (3.0.4)\nchrome-gnome-shell (0.0.0)\ncupshelpers (1.0)\ncycler (0.10.0)\nCython (0.27.3)

I want to split this in a list of tuples. So that each list items has a tuple with two values, the name and the version (without the brackets).

I was only able to split the string by newline but I don't know how to properly grab the numbers in the brackets etc Can someone explain me how I can do this?

EDIT : I am trying to parse pip list local

 def get_installed_modules(self):
    data = subprocess.check_output(["pip", "list", "--local"])
    result = [tuple(line.replace('(', '').replace(')', '').split())
              for line in data.splitlines()]
    print(result)

I have the project that I cant just split the string but it requires a byte like object...

TypeError: a bytes-like object is required, not 'str'

Answer 1

Option 1
If you're getting these outputs from pip, you can do it programmatically, using pip.operations.freeze -

from pip.operations import freeze  

modules = list(
    map(lambda x: x.split('=='), freeze.freeze(local_only=True))
)

print(modules)

[['aiodns', '1.1.1'],
 ['aiohttp', '1.2.0'],
 ['appdirs', '1.4.0'],
 ['appnope', '0.1.0'],
 ['argparse', '1.4.0'],
...

---

Option 2
You could also use get_installed_distributions, taken from here:

import pip

modules = []
for i in pip.utils.get_installed_distributions():
    modules.append((i.key, i.version))

print(modules)

[('pytreebank', '0.2.4'),
 ('cssselect', '1.0.1'),
 ('numba', '0.36.0.dev0+92.g2818dc9e2'),
 ('llvmlite', '0.0.0'),
 ('yarl', '0.8.1'),
 ('xlwt', '1.3.0'),
 ('xlrd', '1.1.0'),
 ...
]

---

Option 3
A third method is using pip.main -

import pip
pip.main(['list', 'local'])

However, this writes to stdout.