How to Extract Numbers from a Text File in Python

Category: Programming

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The process of extracting numbers from a text file in Python involves reading the file's content and then using pattern matching to isolate and retrieve the numerical values. The most effective method is using the re module (Regular Expressions). This technique allows you to: Read the file's text into a string. Apply a specific regex pattern (e.g., r'-?\d+\.?\d*') that can reliably identify integers, decimals, and negative numbers within the text. Use the re.findall() function to return a list of all matching number strings. Convert these resulting strings into actual Python numerical types (like float or int) for use in calculations.