Structural pattern matching, introduced in Python 3.10, is a powerful control flow construct that enhances code readability and conciseness. It integrates conditional statements with destructuring, providing a more declarative coding style. This tutorial covers the key components of pattern matching, including the match statement, case clauses, various pattern types, and common pitfalls. Additionally, it highlights the use of guards, unions, aliases, and binding names to extract values from complex data structures while demonstrating customization for user-defined classes.
Table of contents
Match Is a Statement, Not an ExpressionCase Clauses Aren’t ExhaustiveCase Clauses Don’t Fall ThroughCase Clauses Can OverlapCase Clauses Can’t Have Assignment ExpressionsNot All Patterns Are Made EqualMatching a Python Set Requires a GuardMost Literal Patterns Match by EqualityFloating-Point Patterns Are ImpreciseString Patterns Are Not SequencesCaptured Names May Wind Up UndefinedCapture Patterns Can’t Reuse VariablesUnion Patterns Bind the Same NamesMatching Constant Values Is TrickySort: