print()
1:第一个function_ print()
2:""与‘’ string and code
3:换行的backslash
print("Hello World!\nHello World!")
4:学习string的概念
String Concatenation
5:Indentation
6:Syntax error
7:code block 就是感觉是一行代码
8:input() function
A promt for the user
9:Python Variables
10.len()计算字符 working with string but end up as a integer
11:Data Types
12:type()
#to find out which kind of type is
Once you print it , you will know.
13:type conversion/type casting
str( ) float( )
14:
print(6/3)
float2.0
15:
1)+
2)-
3)*
4)/
5)** 次方
12:Subscript__pull out a number(begin from 0)
"Hello"[4]
print("Hello"[4])
13:Integer
123_456_789
14:Float
3141.59
15:Boolean
True \ False