Simple tokenization with Python

Tokenization is the process of splitting a string into smaller (elementary) units that are further processed afterwards. For the task of preprocessing arithmetic expressions such as 1+2*(3-4) there is no need for a sophisticated tokenizer. Instead, we can use re.findall:

The function also already tackles whitespaces and ignores them correctly. Note that the expression only identifies integers (no floating numbers) correctly.


  • [1] re module reference

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