How to get the length of a list in Python? (code example)

Lists are an integral part of daily programming in Python, and it is essential to understand the related operations of lists. The following article will show you how to get the length of a list in Python. I hope it will be helpful to you.

Method 1: Loop Counter

In this method, just run a loop and increment Counter, until the last element of the list is traversed, its count is obtained, which is the length of the list. This method is the most basic way to get the length of a list.

Code example: Using a loop to traverse the counter to get the list length

# 初始化列表
List = [ 1, 4, 5, 7, 8 ] 
  
# 输出列表
print ("列表为： " + str(List)) 
  
# 初始化计数器，使用循环查找列表长度
counter = 0
for i in List: 
      
    #递增计数器
    counter = counter + 1
  
# 输出列表长度
print ("列表长度为： " + str(counter))

Output:

##Method 2: Use len()

Python len() method to return the length or number of items of an object (character, list, tuple, etc.). It provides the most common and simplest way to find the length of any list; it is also the most common technique employed today.

Code example: Use the len() method to get the list length

Example 1:

# 初始化列表
List = [ "php", "python", 3, 7,"html" ] 
List.append(6) 
List.append("Hello") 
# 输出列表
print ("列表为： " + str(List)) 
# 输出列表长度
print ("列表长度为： " ,len(List))

Output:

Example 1:

n = len([10, 20, 30]) 
# 输出列表长度
print ("列表长度为：" ,n)

Output:

列表长度为：3

Method 3: Using length_hint()

In Python, you can also use the length_hint() method to find the length of a list. This method is a little-known technique for finding the length of a list; it is defined in the operator class and returns the number of elements present in the list.

Code example: Use the length_hint() method to get the list length

from operator import length_hint
# 初始化列表
List = [ 1, 4, 5, 7, 8 ]
# 输出列表
print ("列表为： " + str(List)) 
list_len_hint =length_hint(List)
# 输出列表长度
print ("列表长度为： " + str(list_len_hint))

Output:

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