• os.name

• os.environ
• os.getenv()
• os.putenv()

• os.chdir()
• os.getcwd()

• os.mkdir()
• os.rmdir()

• os.remove()
• os.rename()

• os.walk()

for root, dirs, files in os.walk(path):
    print(root)

• os.path
• basename
• dirname
• exists
• isdir and isfile
• join
• split

• choice
  Question: Roll a dice :)
• choices
  Question: How to generate a 8 digit random password?
• randint
  Question: Roll another dice :))
• random
  Question: keep rolling dices :)))
• shuffle
  Question: feel free to roll a simple dice :))))

• time
• sleep

• dump
• load

from pickle import dump

myList=[1,2]
# some codes to populate myList
# now lets save it to use later

f=open("myList",'wb')
dump(myList,f)
f.close()

from pickle import load
f=open("myList",'rb')
myList=load(f)
print(myList)

• csv
• datetime
• urllib2
• hashlib
• json
• smtplib

first of all check if you have pip or not

$ pip3 --version
pip 19.3.1 from /usr/local/lib/python3.6/dist-packages/pip (python 3.6)

use pip if you have windows

to install pip, if you already don't have it:
In UNIX machines:

$ sudo apt install python3-pip

or use any other package manager up to your distribution

In Windows

python -m pip install pip

or:

1. Download get-pip.py to a folder on your computer.
2. Run that file using python:

$ python get-pip.py

3. FINISH

$ pip3 search <package-name>
$ pip3 install <package-name> --user
$ pip3 list
$ pip3 install <package-name> --upgrade