All about Python

Tips:

• Flattened list of list

  >>> l = [[1,5,6], [4,5,9,7] ,[] ,[] ,[9]]
  [[1, 5, 6], [4, 5, 9, 7], [], [], [9]]
  >>> sum(l, [])
  [1, 5, 6, 4, 5, 9, 7, 9]
  >>> [i for x in l for i in x if type(x) is list]
  [1, 5, 6, 4, 5, 9, 7, 9]
  

• Else with for loop

  >> for i, v in enumerate(range(10)):
  >>   print i,
  >> else:
  >>   print 10
  1 2 3 4 5 6 7 8 9 10
  

• Zen of Python :: run this command in python console

  import this
  

• Virtualenv with system package

   virtualenv --system-site-packages <env_name>
  

• Virtualenv with python3

  virtualenv --python=$(which python3) <env_name>
  

• Virtualenv can’t move. You must edit environment path in

  <your_env>/bin/activate
  <your_env>/bin/activate.csh
  <your_env>/bin/activate.finsh
  

• Install py package into python2

  pip install <package>
  

• Install py package into python3

  pip3 install <package>
  

• Pip upgrade

  pip install <package> --upgrade
  

  or you can use pip-tool to review all pip-package to upgrade

  pip install pip-tools
  pip-review
  pip-dump
  

• Install Project as develop via pip

  # same as 'python setup.py develope'
  pip install --use-mirrors --editable .
  

• Print without newline or spaces

  import sys
  
  for i in xrange(0,10):
      sys.stdout.write(".")
      sys.stdout.flush()
  

• How to execute a file within the python interpreter?

>>> execfile('filename.py')

• How to reload python module imported

import X
reload( X )

• How to use Python’s pip to download and keep the zipped files for a package?

$ pip install --download-cache="/pth/to/downloaded/files" package

• Embedding python in bash scripts
  • Running a python function as a bash command

  • Embed Python in a bash script

    function line {
    PYTHON_ARG="$1" python - <<END
    import os
    line_len = int(os.environ['PYTHON_ARG'])
    print '-' * line_len
    END
    }
    

  • Calling a python function from bash script

    python -c'import themodule; themodule.thefunction("boo!")'
    

• How to print to stderr in Python?

  print >> sys.stderr, 'word'
  

Tools:

• Virtualenv Python Power Tools: virtualenv

  pip install virtualenv
  

  Or

  brew install pyenv-virtualenv
  

• VirtualenvWrapper - Python Power Tools: virtualenvwrapper

  pip install virtualenvwrapper
  

  add this into your .bashrc/.zshrc

  export WORKON_HOME=<env_path>
  source /usr/local/bin/virtualenvwrapper.sh
  

• AutoEnv

  brew install autoenv
  echo 'source /usr/local/opt/autoenv/activate.sh' >> ~/.zshrc
  

• AutoPEP8

# install
$ pip install --upgrade autopep8
# usage
$ autopep8 --in-place --aggressive --aggressive <filename>

• Pyreverse : UML Diagrams for Python

# install
$ pip install pylint
$ apt-get install graphviz

# usage
pyreverse -o png <code>

• Essential python tools - Quality

Python Project

1. What are good open source projects in Python to contribute to and start learning Python?
2. OpenHatch find project to contribute
3. Ask HN: Good Python codebases to read?

Idiomatic Python:

1. Be Pythonic
2. What is Pythonic?
3. Python track: python idioms
4. Code Like a Pythonista: Idiomatic Python
5. PEP8
6. The Hitchhiker’s Guide to Python!
7. Index of Python Enhancement Proposals
8. 30 Python Language Features and Tricks You May Not Know About
9. Transforming code into Beautiful, Idiomatic Python by Raymond Hettinger
10. Python Tips, Tricks, and Hacks
11. Writing Idiomatic Python
12. Python 3 Patterns, Recipes and Idioms
13. Decorators: A Powerful Weapon in Your Python Arsenal
14. Anti-Patterns in Python Programming
15. Best python tricks and one-liners
16. Python Tips and Traps
17. Python: faster way Tricks for your code run faster
18. The Little Book of Python Anti-Patterns

Tutorial Python

1. Python Koans
2. New Coder Python
3. Problem Solving with Algorithms and Data Structures Python
4. Everyday Python Project
5. Python Regular Expressions
6. Python Practice Book

Functional Programming in Python

1. O’Reilly Functional Programming in Python
2. FUNCTIONAL PROGRAMMING WITH PYTHON by BY ALEXEY KACHAYEV, 2012
3. Functional Programming HOWTO

Design Patterns Python:

1. Python Patterns
2. Six GoF design patterns, Python style
3. Generic adapter class in Python
4. Bridge Patterns Python
5. Python Best Practice Patterns by Vladimir Keleshev
6. Python SOLID
7. The Clean Architecture in Python
8. Stop Writing Classes

Optimization Python

1. 10 Ways to Make Python Go Faster
2. Speeding Up Your Python Code
3. PythonSpeed
4. How to Make Python Faster Without Trying That Much

Python Debugger (pdb)

1. Getting started with the Python Debugger pdb
2. Python Debugging Techniques
3. Debugging in Python
4. Getting Started with the Python Debugger
5. pdb – Interactive Debugger
6. Tutorial: Debugging your Python Applications with pdb(Youtube)
7. Introduction to PDB(Youtube)
8. setting breakpoints with nosetests –pdb option

Logging

1. Become a logging expert in 30 minutes(Youtube)

Framework

1. Awesome Python

Python Tutorial

1. Must-watch videos about Python
2. pyvideo.org

Python Testing

ETC.

1. Terminating a Python script
2. Should I put #! (shebang) in Python scripts, and what form should it take?
3. Simple file server to serve current directory
4. How to reload python module imported using “from module import *”
5. 10 awesome features of Python that you can’t use because you refuse to upgrade to Python 3
6. From C++ to Python (1) - ไทย
7. From C++ to Python (2) - ไทย