Python Enhancement Proposal
Notes on the fundamental of Python Language , relevant references, and cool things around it.
eSumit@Sumits-MacBook-Pro:~$ pyenv doctor Cloning /Users/eSumit/.pyenv/plugins/pyenv-doctor/bin/..... Installing python-pyenv-doctor... python-build: use readline from homebrew Installed python-pyenv-doctor to /var/folders/kr/bq8kqm_54l13knm864fxk78m0000gn/T/pyenv-doctor.20180111002154.5923/prefix Congratulations! You are ready to build pythons!
Python Fundamentals :
Python is portable in different OS
Python developed by Guido Van Rossum in Netherlands (1986)
Multiple Implementation of Pythin e.g. CPython , JPython
Two Version : Python 2 (2.6. , 2.7)(started since 2004) and Python 3 (3.0, 3.1,3.2,3.3,3.4..3.7) (started since 2008)
Indentation (four spaces) must match that is like to use opening and closing brackets in other language, Never mix spaces and tabs
Check Python Enhancement Proposals
Python strongly typed language, and dynamic type language
Python comes with standard problems, to use type import math
Current version of Python : 3.6.4
dir(__builtins__) gives all builtin functions used in python e.g. max(4,2,1,5,8) give 8 as output
None when no value available to a variable
bool(0) is false rest of the true, only bool(“”) empty string is false.
if expr:
(four spaces) print (“expr is True”);
else :
(four spaces) print (“expr i sFalse”);
Collections : str,list,dict,tuple,range,set
Multiline can start and stop with three single quotes
Type help(str) it will give all function
from def we create functions and then we crea
#!/usr/bin/env python3 in each file like which interpreter to use
In a dynamic type system object types are only resolved at runtime.
Comprehensions in Python : List,Set, Dictionary Comprehensions , Style (Declarative and Functional ),
Generators in Python
Python Developer ToolKit
pip freeze > requirements.txt (save your project dependencies in requirements.txt
Setup.py for installation script
Nose -test package
PIP Installing Package, PyPI – Python Package Index
PIP Commands e.g. pip list, pip show requests , pip search query
Virtualenv or venv for virtual environment, Virtual EnWrapper – Isolated Python Environments
Pylint for code quality
PDB As Python Debugger e.g. python3 -m pdb program-name.py
Python for web development e.g. django, Flask, Pyramid
Tools of Python for Cloud Configuration e.g. Ansible, Boto3 for AWS
Python for Data Analytics e.g Pandas, Matplotlib, Bokeh
Intellij Ultimate
PyChython arm
Python Packaging Authority (PyPA)
>> import sys
>>> sys.path
[”, ‘/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg’, ‘/Library/Python/2.7/site-packages/virtualenvwrapper-4.8.2-py2.7.egg’, ‘/Library/Python/2.7/site-packages/stevedore-1.28.0-py2.7.egg’, ‘/Library/Python/2.7/site-packages/virtualenv_clone-0.2.6-py2.7.egg’, ‘/Library/Python/2.7/site-packages/six-1.11.0-py2.7.egg’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload’, ‘/Library/Python/2.7/site-packages’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python’, ‘/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC’]
>>>
Where Python used ?
- Linux Scripting and Administration
- Web Development
- Application Scripting
- Data Science
Python 2 (pip2,python2,ipython2 – official legacy code)
vs
Python 3
Reference :
Sumit Arora 