32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
---
|
||
title: Python Len Function
|
||
localeTitle: Python Len函数
|
||
---
|
||
`len()`是Python 3中的内置函数。此方法返回对象的长度（项数）。它需要一个参数`x` 。
|
||
|
||
## 参数
|
||
|
||
它需要一个参数， `x` 。此参数可以是序列（例如字符串，字节，元组，列表或范围）或集合（例如字典，集合或冻结集）。
|
||
|
||
## 回报价值
|
||
|
||
此函数返回传递给`len()`函数的参数中的元素数。
|
||
|
||
## 代码示例
|
||
```
|
||
list1 = [123, 'xyz', 'zara'] # list
|
||
print(len(list1)) # prints 3 as there are 3 elements in the list1
|
||
|
||
str1 = 'basketball' # string
|
||
print(len(str1)) # prints 10 as the str1 is made of 10 characters
|
||
|
||
tuple1 = (2, 3, 4, 5) # tuple
|
||
print(len(tuple1)) # prints 4 as there are 4 elements in the tuple1
|
||
|
||
dict1 = {'name': 'John', 'age': 4, 'score': 45} # dictionary
|
||
print(len(dict1)) # prints 3 as there are 3 key and value pairs in the dict1
|
||
```
|
||
|
||
 [运行代码](https://repl.it/CUmt/15)
|
||
|
||
[官方文件](https://docs.python.org/3/library/functions.html#len) |