What is the meaning of list in Python? Understand the methods and usage of lists in Python in one article

List in Python is a common data type in python. It is a built-in class in python and inherits from object. Next, we will comprehensively introduce the common methods of list and the class that implements the function of classPython list

define list

>>> li = ["a", "b", "mpilgrim", "z", "example"]
>>> li 
['a', 'b', 'mpilgrim', 'z', 'example']
>>> li[0]
'a' 
>>> li[4]
'example'

Negative list index

>>> li 
['a', 'b', 'mpilgrim', 'z', 'example']
>>> li[-1] 
'example' 
>>> li[-3] 
'mpilgrim' 
>>> li 
['a', 'b', 'mpilgrim', 'z', 'example']
>>> li[1:3]  
['b', 'mpilgrim'] 
>>> li[1:-1] 
['b', 'mpilgrim', 'z'] 
>>> li[0:3]  
['a', 'b', 'mpilgrim']

Add element to list

>>> li 
['a', 'b', 'mpilgrim', 'z', 'example']
>>> li.append("new")
>>> li 
['a', 'b', 'mpilgrim', 'z', 'example', 'new']
>>> li.insert(2, "new")
>>> li 
['a', 'b', 'new', 'mpilgrim', 'z', 'example', 'new']
>>> li.extend(["two", "elements"]) 
>>> li 
['a', 'b', 'new', 'mpilgrim', 'z', 'example', 'new', 'two', 'elements']

Traverse

     list1 = [x for x in range(0,10,2)]          
      # 方法一      
      for i in range(len(list1)):         
           print(list1[i], end=' ')            
      # 方法二      
      for x in list1:       
         print(x, end=' ')            
      # 方法三      
      for ind,value in enumerate(list1):          
           print(ind, value, sep='=', end = ' ')

The above is my personal understanding. If there are any misunderstandings or errors, please correct me

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