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What does list mean in python

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Jun 21, 2019 pm 04:00 PM

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What does list mean in python

List in python is a list, which is a data type.

Sequence is the most basic data structure in Python. Each element in the sequence is assigned a number - its position, or index, with the first index being 0, the second index being 1, and so on.

Python has 6 built-in types for sequences, but the most common are lists and tuples.

Operations that can be performed on sequences include indexing, slicing, adding, multiplying, and checking members.

In addition, Python has built-in methods for determining the length of a sequence and determining the largest and smallest elements.

List is the most commonly used Python data type, which can appear as a comma-separated value within square brackets.

The data items of the list do not need to be of the same type

To create a list, just use square brackets to enclose the different data items separated by commas. It looks like this:

list1 = [&#39;physics&#39;, &#39;chemistry&#39;, 1997, 2000]
list2 = [1, 2, 3, 4, 5 ]
list3 = ["a", "b", "c", "d"]

Like string indexing, list indexing starts at 0. Lists can be intercepted, combined, etc.

Add elements to the list

>>> li 
[&#39;a&#39;, &#39;b&#39;, &#39;mpilgrim&#39;, &#39;z&#39;, &#39;example&#39;]
>>> li.append("new")
>>> li 
[&#39;a&#39;, &#39;b&#39;, &#39;mpilgrim&#39;, &#39;z&#39;, &#39;example&#39;, &#39;new&#39;]
>>> li.insert(2, "new")
>>> li 
[&#39;a&#39;, &#39;b&#39;, &#39;new&#39;, &#39;mpilgrim&#39;, &#39;z&#39;, &#39;example&#39;, &#39;new&#39;]
>>> li.extend(["two", "elements"]) 
>>> li 
[&#39;a&#39;, &#39;b&#39;, &#39;new&#39;, &#39;mpilgrim&#39;, &#39;z&#39;, &#39;example&#39;, &#39;new&#39;, &#39;two&#39;, &#39;elements&#39;]

Traverse the list

list1 = [x for x in range(0,10,2)]         
 # 方法一      
 for i in range(len(list1)):         
      print(list1[i], end=&#39; &#39;)           
 # 方法二      
 for x in list1:       
    print(x, end=&#39; &#39;)           
 # 方法三      
 for ind,value in enumerate(list1):          
      print(ind, value, sep=&#39;=&#39;, end = &#39; &#39;)

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