Python_0

Some basic concepts about Python：

1. Function: Sth. that helps u directly or indirectly achieve some target
2. DataType： Distinguish elements for different uses
3. Grammar： Standards for coding
4. Structure： Logic for coding
5. Packages： Sth. that provide useful fuxs for u to manipulate

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Before coding(Notice & some Grammar):

1. Encoding for Chinese：

#-*- coding:utf-8 -*-

Other Choices： GB2312、GBK、GB18030

2.Path

Ex. for linux

$ PATH=$PATH:/usr/local/python3/bin/python3  

3.Keywords

Python has some keywords that cannot be edited or changed
Ex: False,True,None,and,or,class,if,def,...,etc.

For search:

import keyword
keyword.kwlist

4.Indent 缩进 & Multi-line code

Indent:
Python use indent (TAB) to display code blocks (no use for {})

if True:
    print ("True")
else:
    print ("False")

Multi-line code:
Use " \ " to connect

total = item_one + \
        item_two + \
        item_three

5. Print & Import

Print in Python 3.0:

a="x"
print(a)   #output with "Enter" 换行
print (a,end=" ")    #output with " " 不换行 

Import:
将整个模块(somemodule)导入
从某个模块中导入某个函数
从某个模块中导入多个函数
将某个模块中的全部函数导入
分别对应：

import somemodule
from somemodule import somefunction
from somemodule import firstfunc, secondfunc, thirdfunc
from somemodule import *

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