Errata

Errata for Architecture Patterns with Python

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The errata list is a list of errors and their corrections that were found after the product was released.

The following errata were submitted by our customers and have not yet been approved or disproved by the author or editor. They solely represent the opinion of the customer.

Color Key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version	Location	Description	Submitted by	Date submitted
PDF	Page Chapter 11, Section 'Our New Outgoing Event', Page 171 Last paragraph	In chapter 10, HANDLERS dictionary is transformed to two dictionaries: COMMAND_HANDLERS and EVENT_HANDLERS. On this page, HANDLERS is used again. It should be changed to EVENT_HANDLERS. Chapter 11 branch on Github confirms this.	Mojtaba Mir Yaghoobzadeh	May 06, 2023
Printed	Page 14 test code in the middle of the page	In the test_allocation_is_idempotent() function I think the batch.allocate(line) called accidentally twice either remove one call or change the assert to 16	Kostas Vogiatzis	Jun 26, 2022
Printed	Page 28 Top of page, orm.py class OrderLine	-qty = Integer(String(250)) +qty = Column(Integer()) The line was probably copied from the previous line for 'sku' but insted of changing 'String' into 'Integer' 'Column' was replaced by mistake.	Philipp Hahn	Jan 22, 2023
Printed	Page 49 Code example	At the beginning of the method, a variable named source_hashes is created. A few lines down, it referred to as src_hashes. Not a big deal, but it did throw me off for a second.	Sandeep Gill	May 02, 2022
Mobi	Page 199 Exercise for the reader: class FakeMessageBus()	self.handlers = … Instance attribute handlers should be capitalized for the parent class‘ method „handle()“ to work: self.HANDLERS = …	Christopher Graf	Jan 29, 2022
Mobi	Page 246 Box: Rebuilding from scratch	„add_allocate_to_read_model“ should be „add_allocation_to_read_model“	Christopher Graf	Jan 30, 2022