One of the basics of Python

In order to get a better understanding of the Python language, I find it very necessary to take notes.

First, based on the current trends in Python, all of the notes I've made are Python3 and above.

The following is a formal introduction to Python.

1. Computer languages generally have input and output, and Python is no exception:

Output function: print ()

Input function: input ("You can add a hint here")

2. Notes

Line comment: Add # at the beginning

Multiline Comment: Start and end with "" "or" "

3. Data type

Number (numeric):

Int:num1=12

float:num2=12.0

Complex:num3=1+2j

Str (String):

str= ' Hello World '

Print (Str[0:2])--"he #在python里面可以任意切割字符串, [0:2] means starting from 0 bits to 2nd bit but not including

Print (str[0:2]*2)--"hehe #*2 printing two times Str[0:2]

str[1]= ' t ' #报错, in Python str is not allowed to change

List (lists):

list=[' Hello ', +, ' Ben ']

list1=[' world ',%, ' Han '

Print (list[2])--"Ben

Print (List[0:2])--"[' Hello ', 21]

Print (List+list1)-"[' Hello ', ' + ', ' Ben ', ' World ', ', ' Han ']

List[1]=18;print (List[1])--"#在Python中同一行写多个语句在中间加上;

Tuple (tuple):

Tuple= (' book ', ' Next ', 17)

#与列表相似, the difference is that a tuple cannot modify

#当tuple只有宇哥元素是后面需要加上, e.g. t= (12,)

Set (SET):

set={"Yellow", "blue", "green"} #set是一个无序且不重复的序列

Dictionary (dictionary):

dic={"name": "Rose", "age": +, "Sex": "Girl"}

dic[' age ']=16 #字典通过key修改value

Dic.values () #获取所有的values

Dic.key () #获取所有的key

#创建空字典是用 {}, empty collection with ()

OK, this article is here, I hope to help you:)

　　　　　　

　　　　　　

　　　　　　

　　　　

　　　　　　

　　　　　　

　　　　　　

One of the basics of Python