import sys
import subprocess
subprocess.run([sys.executable, '-m', 'pip', 'list'])

↓

asn1crypto (0.24.0)
cryptography (2.1.4)
Cython (0.29.16)
decorator (4.4.2)
idna (2.6)
joblib (0.14.1)
keyring (10.6.0)
keyrings.alt (3.0)
llvmlite (0.31.0)
netifaces (0.10.4)
networkx (2.4)
numba (0.48.0)
numpy (1.18.2)
pip (9.0.1)
pycrypto (2.6.1)
Pygments (2.2.0)
pygobject (3.26.1)
python-apt (1.6.5+ubuntu0.2)
pyxdg (0.25)
PyYAML (3.12)
scikit-learn (0.22.2.post1)
scipy (1.4.1)
SecretStorage (2.3.1)
setuptools (46.1.3)
six (1.11.0)
unattended-upgrades (0.1)
wheel (0.30.0)