Pyhton3 cheatsheet

1-PythonBasicsCheatCheet.md

Data Types

Integer     -256, 15
Float       -253.23, 1.253e-10
String      "­Hello", 'Goodbye', """­Multiline­"""
Boolean     True, False
List        [ value, ... ]
Tuple       ( value, ... )
Dictionary  { key: value, ... }
Set         { value, value, ... }

References

• https://www.cheatography.com/sschaub/cheat-sheets/essential-python/

2-StringWrangling.md

String split

email= a@b.c
org = email.split('@')[1] # org = 'b.c'

Use of Regex

find all element

content = 'I have 10 fingers and 2 eyes'
re.findall('[0-9]+',content)] # returns ['10', '2']

References

• Python 2 : https://docs.python.org/2/library/string.html
• Python 3: https://docs.python.org/3.5/library/string.html

BeautifulSoup4.md

https://www.crummy.com/software/BeautifulSoup/bs4/doc/

from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'html.parser')
tags = soup.find_all('span')

Urllib.md

import urllib.request
url = 'http://abc.net/file.html'
html = urllib.request.urlopen(url).read()

virtualenv.md

Install virtualenv

https://packaging.python.org/installing/#creating-virtual-environments

3.3+ built-in. In Ubuntu:

sudo apt-get install python3-venv

can be added to 2.6+/3.1+ :

pip install virtualenv

Create new virtualenv specifying which version of Pyhton using

3.3+: python3 -m venv my_venv_path

activate the virtualenv

source my_venv_path/bin/activate

deatctivate virtualenv

deactivate