Python enumerate() 函数详解：语法、参数与多类型应用实例

一只小鹿

发布时间：2026-10-14 | 3人浏览过

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本文详细介绍 Python 内置函数 enumerate() 的核心功能与使用方法。该函数可将列表、元组或字符串等可遍历对象组合为索引序列，常用于 for 循环中。文章解析了 sequence 和 start 参数的具体作用，并通过包含列表、元组及字符串的多组代码实例，演示了默认索引与自定义起始索引的实际输出效果，帮助开发者高效处理数据遍历任务。

enumerate() 函数功能概述

1. 功能概述：

enumerate() 是 Python 的内置函数，主要用于将列表、元组或字符串等可遍历的数据对象转换为一个包含索引和数据的序列。它通常与 for 循环配合使用，能够同时获取元素的值及其对应的下标位置。

函数语法与参数详解

2. 函数语法

enumerate(sequence, [start=0])

3. 参数说明：

sequence：必填参数，指代需要被枚举的序列、迭代器或其他支持迭代操作的对象。
start：可选参数，用于指定索引的起始数值，默认值为 0。

4. 返回值说明

该函数返回一个 enumerate 枚举对象，可在循环中直接解包使用。

多类型数据遍历实例

5. 代码实例


list1 = [10,20,30,40,"maple","yf",60]

tup1 = (100,200,300,400,"hao","qazert",600)

str1 = "1234qwertjdsa22323"

for index1,item1 in enumerate(list1):
  print("index1 = %d, item1 = %s" %(index1,item1,))

print("------------------------------")
for index2, item2 in enumerate(list1,start = 2):
  print("index2 = %d, item2 = %s" %(index2,item2,))

print("******************************")
for index3,item3 in enumerate(tup1):
  print("index3 = %d, item3 = %s" % (index3, item3,))

print("==============================")
for index4,item4 in enumerate(tup1, start = 4):
  print("index4 = %d, item4 = %s" % (index4, item4,))

print("%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
for index5,item5 in enumerate(str1):
  print("index4 = %d, item4 = %s" % (index5, item5,))

print("$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$")
for index6,item6 in enumerate(str1,start = 6):
  print("index4 = %d, item4 = %s" % (index6, item6,))
  
#输出的结果如下：
index1 = 0, item1 = 10
index1 = 1, item1 = 20
index1 = 2, item1 = 30
index1 = 3, item1 = 40
index1 = 4, item1 = maple
index1 = 5, item1 = yf
index1 = 6, item1 = 60
------------------------------
index2 = 2, item2 = 10
index2 = 3, item2 = 20
index2 = 4, item2 = 30
index2 = 5, item2 = 40
index2 = 6, item2 = maple
index2 = 7, item2 = yf
index2 = 8, item2 = 60
******************************
index3 = 0, item3 = 100
index3 = 1, item3 = 200
index3 = 2, item3 = 300
index3 = 3, item3 = 400
index3 = 4, item3 = hao
index3 = 5, item3 = qazert
index3 = 6, item3 = 600
==============================
index4 = 4, item4 = 100
index4 = 5, item4 = 200
index4 = 6, item4 = 300
index4 = 7, item4 = 400
index4 = 8, item4 = hao
index4 = 9, item4 = qazert
index4 = 10, item4 = 600
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
index4 = 0, item4 = 1
index4 = 1, item4 = 2
index4 = 2, item4 = 3
index4 = 3, item4 = 4
index4 = 4, item4 = q
index4 = 5, item4 = w
index4 = 6, item4 = e
index4 = 7, item4 = r
index4 = 8, item4 = t
index4 = 9, item4 = j
index4 = 10, item4 = d
index4 = 11, item4 = s
index4 = 12, item4 = a
index4 = 13, item4 = 2
index4 = 14, item4 = 2
index4 = 15, item4 = 3
index4 = 16, item4 = 2
index4 = 17, item4 = 3
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
index4 = 6, item4 = 1
index4 = 7, item4 = 2
index4 = 8, item4 = 3
index4 = 9, item4 = 4
index4 = 10, item4 = q
index4 = 11, item4 = w
index4 = 12, item4 = e
index4 = 13, item4 = r
index4 = 14, item4 = t
index4 = 15, item4 = j
index4 = 16, item4 = d
index4 = 17, item4 = s
index4 = 18, item4 = a
index4 = 19, item4 = 2
index4 = 20, item4 = 2
index4 = 21, item4 = 3
index4 = 22, item4 = 2
index4 = 23, item4 = 3

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