Category:Python

Sub-category

• Micropython

Basic

file operation

    myfile = open('/srv/www/idehe.com/stock/data.txt', 'w')
    myfile.writelines('\n')    
    myfile.close()

    myfile = open('/srv/www/idehe.com/stock/data.txt', 'a')             # open for output (creates)
    myfile.writelines('\n')
    myfile.writelines(line1)        # write a line of text
    myfile.writelines('\n')   
    myfile.writelines(line2)        # write a line of text
    myfile.close()

Operation

not is evaluated first; and is evaluated next; or is evaluated last.

Group, List, Dict

• group = (), list = [], dict = {}

List

• L[2] 'SPAM!' read the third element
• L[-2] 'Spam' red the last third element
• L[1:] ['Spam', 'SPAM!'] cut the list from the second element

Pratical Test

• for loop

for x in range (xxx, 0, -1):

Project

install/unstall a library, first install pip: apt-get install python-pip

pip install datetime
pip uninstall datetime 

common used library

• Datetime
• Django

Kivy

For android

• install debian jessie, install python-kivy, python-pip
• install buildozer (pip install), java SDK (default-jdk), cython, etc
• buildozer init, and run: buildozer set default android_new debug deploy run, android USB debug should turn on
• buildozer need ANT, SDK, NDK on first time

Other

• python-web

Reference

• https://www.codecademy.com/learn
• symbol review: http://learnpythonthehardway.org/book/ex37.html

Python

• Python 3.52 download page here.

For Raspberry Pi

SPIDEV

• sudo apt-get install python-dev

Image sudo apt-get install python-imaging