01-python Foundation

A few days ago, I think Python simply can't, did not take notes carefully, and then today turned over the next few days to see things, or write down

For python2.7 and Python3, it is recommended to use the Python3 mode programming and then use the python2.7 package to run

1, head

Python file header is generally used to declare, a shell is somewhat similar, of course, Windows useless

#!/usr/bin/env python#encoding=utf-8

2, reserved child

The python reserved word has

>>>Import Keyword>>>keyword.kwlist['False','None','True',' and',' as','assert',' Break','class','Continue','def','del','elif','Else','except','finally',' for',' from','Global','if','Import','inch',' is','Lambda','nonlocal',' not','or','Pass','Raise','return','Try',' while',' with','yield']

3, Python controls the block of code by indenting it, so Python requires strict indentation,

Note that when EditPlus remotely connects to Linux, the TAB key is 8 bytes and there will be pits ...

4, Note:

# Single Comment " "  " "

5, multi-line output

Total = Item_one +         +         item_three

6, data type

The Python data type has

Numeric type: int, float, bool, complex (plural) string type: String collection type: list, sets, dictionary, Tuple

Dict uses a special hash algorithm, so the query speed is almost constant no matter how many keys are.

7, import other modules

Import SYS  from SYS import ARGV  from sys import * # is not recommended for use

01-python Foundation