Similarities and differences in Chinese text length calculation: comparison of lenb function and len function

The similarities and differences between the lenb function and the len function for calculating the length of Chinese text require specific code examples

[Introduction]
When using programming languages ​​to process Chinese text , we often need to calculate the length of text. In Python, commonly used functions for calculating text length include len and lenb. These two functions have some similarities and differences when processing Chinese text. This article will illustrate their differences through specific code examples.

[Analysis]

1. len function:
   The len function is a built-in function in Python, used to calculate the length of a string. It is suitable for processing strings of arbitrary characters, including Chinese characters. The specific code example is as follows:

   s = "Hello, 世界！"
   print(len(s))  # 输出：11

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   In this example, the string s contains 11 characters, including an English comma and two Chinese characters, so the result of len(s) is 11.

2. lenb function:
   The lenb function is an extension function in Python, which calculates the length through bytes type data. Different from the len function, the lenb function treats each Chinese character as 3 bytes when calculating Chinese characters. The specific code example is as follows:

   s = "Hello, 世界！"
   b = s.encode('utf-8')
   print(lenb(b))  # 输出：17

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   In this example, we first convert the string s into bytes type data b, using utf-8 encoding. Under UTF-8 encoding, each Chinese character occupies 3 bytes, so the length of string s is 17.

[Summary]
Generally speaking, the len function is suitable for calculating the length of any string, including Chinese characters; the lenb function is suitable for calculating the length of bytes type data, and Think of each Chinese character as 3 bytes. When processing Chinese text, we often need to consider the character encoding method and the data type of the string to choose an appropriate length calculation function.

[Extension]
If we want to uniformly calculate the length of Chinese characters without considering character encoding and type, we can use in the Python third-party library zhconv zh_len function. It can directly calculate the length of Chinese strings without converting encoding or data type. The specific code example is as follows:

from zhconv import zh_len

s = "Hello, 世界！"
print(zh_len(s))  # 输出：7

In this example, we directly use the zh_len function to calculate the length of the Chinese string. The final result is 7, which is consistent with the actual number of Chinese characters.

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