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### Motivation and Context <!-- Thank you for your contribution to the semantic-kernel repo! Please help reviewers and future users, providing the following information: 1. Why is this change required? 2. What problem does it solve? 3. What scenario does it contribute to? 4. If it fixes an open issue, please link to the issue here. --> It's shame sometimes it shines through that some of the earliest code in the python code base was a direct port from C#, like with the .get method on the context variables, made the change here to have the exact some signature as the default python dict. Also replaces contains_key with __contains__ so that 'in' keyword can be used, just like a normal dict. Fixes #2962 ### Description <!-- Describe your changes, the overall approach, the underlying design. These notes will help understanding how your code works. Thanks! --> Changed the .get method Replaced the contains_key method with __contains__ Made changes in samples, tests and planner to deal with that. ### Contribution Checklist <!-- Before submitting this PR, please make sure: --> - [x] The code builds clean without any errors or warnings - [x] The PR follows the [SK Contribution Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md) and the [pre-submission formatting script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts) raises no violations - [x] All unit tests pass, and I have added new tests where possible - [ ] I didn't break anyone 😄 --------- Co-authored-by: Devis Lucato <[email protected]> Co-authored-by: Devis Lucato <[email protected]>
Prompt Template Engine
The Semantic Kernel uses the following grammar to parse prompt templates:
# BNF parsed by TemplateTokenizer
[template] ::= "" | [block] | [block] [template]
[block] ::= [sk-block] | [text-block]
[sk-block] ::= "{{" [variable] "}}" | "{{" [value] "}}" | "{{" [function-call] "}}"
[text-block] ::= [any-char] | [any-char] [text-block]
[any-char] ::= any char
# BNF parsed by CodeTokenizer:
[template] ::= "" | [variable] " " [template] | [value] " " [template] | [function-call] " " [template]
[variable] ::= "$" [valid-name]
[value] ::= "'" [text] "'" | '"' [text] '"'
[function-call] ::= [function-id] | [function-id] [parameter]
[parameter] ::= [variable] | [value]
# BNF parsed by dedicated blocks
[function-id] ::= [valid-name] | [valid-name] "." [valid-name]
[valid-name] ::= [valid-symbol] | [valid-symbol] [valid-name]
[valid-symbol] ::= [letter] | [digit] | "_"
[letter] ::= "a" | "b" ... | "z" | "A" | "B" ... | "Z"
[digit] ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"