32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
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---
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title: Python Len Function
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localeTitle: Python Len函数
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---
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`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` 。
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## 参数
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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）。
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## 回报价值
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此函数返回传递给`len()`函数的参数中的元素数。
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## 代码示例
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```
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list1 = [123, 'xyz', 'zara'] # list
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print(len(list1)) # prints 3 as there are 3 elements in the list1
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str1 = 'basketball' # string
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print(len(str1)) # prints 10 as the str1 is made of 10 characters
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tuple1 = (2, 3, 4, 5) # tuple
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print(len(tuple1)) # prints 4 as there are 4 elements in the tuple1
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dict1 = {'name': 'John', 'age': 4, 'score': 45} # dictionary
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print(len(dict1)) # prints 3 as there are 3 key and value pairs in the dict1
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```
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 [运行代码](https://repl.it/CUmt/15)
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[官方文件](https://docs.python.org/3/library/functions.html#len)
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