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目录

1. Row connector

2. Object in python

-id()

-type()

-Example

Defination of object in python

1. Row connector

Row connector intend to connect two rows as one row in syntax.

Python 3.9.7 (v3.9.7:1016ef3790, Aug 30 2021, 16:25:35) 
[Clang 12.0.5 (clang-1205.0.22.11)] on darwin
Type "help", "copyright", "credits" or "license()" for more information.
>>> print("row-connector")
row-connector
>>> string = "abcdefghijklmnopqrstuvwxyz"
>>> string
'abcdefghijklmnopqrstuvwxyz'
>>> string_ = "abcdefgh"
SyntaxError: EOL while scanning string literal
>>> string2 = "abcdefgh
ijklmnopqrstuvwxy
z"
>>> string2
'abcdefghijklmnopqrstuvwxyz'
>>> array = [1, 34, 545, 67, 009, 4, 655303]
SyntaxError: leading zeros in decimal integer literals are not permitted; use an 0o prefix for octal integers
>>> array = [1, 34, 545, 67, 9, 4, 655303]
>>> array
[1, 34, 545, 67, 9, 4, 655303]
>>> array = [1, 3, 4
	 , 3, 4, 5, 3, 90]
>>> array
[1, 3, 4, 3, 4, 5, 3, 90]
>>> 

2. Object in python

As we all known, python is an objective programming language. 

Let us see two functions:

-id()

This funciton intends to show the address code of an object.

-type()

This one intends to show the type of the object. 

Futhermore, we could get more usages from the hint when you are coding. 

-Example

>>> string = "abcdefghijklmnopqrstuvwxyz"
>>> string
'abcdefghijklmnopqrstuvwxyz'

>>> string2 = "abcdefgh
ijklmnopqrstuvwxy
z"
>>> string2
'abcdefghijklmnopqrstuvwxyz'
>>> array = [1, 34, 545, 67, 9, 4, 655303]
>>> array
[1, 34, 545, 67, 9, 4, 655303]
>>> array = [1, 3, 4
	 , 3, 4, 5, 3, 90]
>>> array
[1, 3, 4, 3, 4, 5, 3, 90]
>>> 
>>> id(array)
4360215104
>>> type(array)

>>> id(string)
4350198288 # we can see here, the same string is from the same address!
>>> id(string2)
4350198288 # we can see here, the same string is from the same address!
>>> type(string)

>>> 

There is a funny findings, when you named, defined two variables with same value for example in the instance above the 'string' and 'string2' is the same content, and the address is same.

Defination of object in python

a block of memory, has its particular type and value, available for some relevant operations

The reference

Above example is from GaoQi sxt lesson video.