Unlocking Python's AST: The Metaprogramming Superpower You Didn't Know You Had
summary
Builds a concrete linter that parses code with Python's ast module, walks nodes with ast.NodeVisitor, and decompiles nodes back to source using astor to detect calls to requests.get missing a timeout. It inspects Call nodes for Attribute funk values, checks .value.id == "requests" and .attr == "get", scans keyword args and treats keyword values of Constant(None) as invalid. Tested on a sample file and flags one invalid call at line 6, column 19.
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chapters (6)
- 0:00The problem definition
- 1:19Evaluating potential solutions
- 3:39Introduction to ASTs
- 7:53Traversing trees with visitors
- 11:54Implementing the solution
- 16:08Conclusion and resources
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