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Python Gen

The Zen of Python


Long time Pythoneer Tim Peters succinctly channels the BDFL's guiding principles for Python's design into 20 aphorisms, only 19 of which have been written down.

The Zen of Python

Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense. Readability counts. Special cases aren't special enough to break the rules. Although practicality beats purity. Errors should never pass silently. Unless explicitly silenced. In the face of ambiguity, refuse the temptation to guess. There should be one-- and preferably only one --obvious way to do it. Although that way may not be obvious at first unless you're Dutch. Now is better than never. Although never is often better than right now. If the implementation is hard to explain, it's a bad idea. If the implementation is easy to explain, it may be a good idea. Namespaces are one honking great idea -- let's do more of those!

Easter Egg (in IDLE):
>>> import this

Python Packages File Structure

for an app named myapp:


└── myapp
    ├── myapp
    │   ├──
    │   ├──
    │   ├──
    │   ├── static
    │   │   ├── css
    │   │   │   └── main.css
    │   │   ├── img
    │   │   └── js
    │   └── templates
    │       ├── layout.html
    │       ├── index.html
    │       ├── login.html
    │       └── other_template.html


└── myapp
    ├── static
    │   ├── css
    │   ├── img
    │   └── js
    ├── templates

Python CLI Commands Ref

  • clear screen (win)
import os
clear = os.system('cls')
  • or on one line
import os; clear = os.system('cls')
  • check python version
import sys
#for version 2.x
print sys.version_info[:]
#for version 3.x
print (sys.version_info[:])