This is a 1:1 mapping of the features listed in https://docs.python.org/3/reference/ and their support in TorchScript. The categorizations are as follows:
| Section | Status | Note |
|---|---|---|
| 1. Introduction | Not Relevant | |
| 1.1. Alternate Implementations | Not Relevant | |
| 1.2. Notation | Not Relevant | |
| 2. Lexical analysis | Not Relevant | |
| 2.1. Line structure | Not Relevant | |
| 2.1.1. Logical lines | Not Relevant | |
| 2.1.2. Physical lines | Supported | |
| 2.1.3. Comments | Supported | |
| 2.1.4. Encoding declarations | Not Supported | TorchScript explicitly don't support unicode |
| 2.1.5. Explicit line joining | Supported | |
| 2.1.6. Implicit line joining | Supported | |
| 2.1.7. Blank lines | Supported | |
| 2.1.8. Indentation | Supported | |
| 2.1.9. Whitespace between tokens | Not Relevant | |
| 2.2. Other tokens | Not Relevant | |
| 2.3. Identifiers and keywords | Supported | |
| 2.3.1. Keywords | Supported | |
| 2.3.2. Reserved classes of identifiers | Supported | |
| 2.4. Literals | Not Relevant | |
| 2.4.1. String and Bytes literals | Supported | |
| 2.4.2. String literal concatenation | Supported | |
| 2.4.3. Formatted string literals | Partially Supported | |
| 2.4.4. Numeric literals | Supported | |
| 2.4.5. Integer literals | Supported | |
| 2.4.6. Floating point literals | Supported | |
| 2.4.7. Imaginary literals | Not Supported | |
| 2.5. Operators | Partially Supported | Not supported: <<, >>, := |
| 2.6. Delimiters | Partially Supported | Not supported: **=, <<=, >>=, %=, ^=, @=, &=, //=, % operator for some types (e.g. str) |
| 3. Data model | Not Relevant | |
| 3.1. Objects, values and types | Not Relevant | |
| 3.2. The standard type hierarchy | Partially Supported | Not supported: NotImplemented, Ellipsis, numbers.Complex, bytes, byte arrays, sets, frozen sets, generators, coroutines, async generators, modules, I/O objects, internal objects, slice objects ( though slicing is supported), classmethod |
| 3.3. Special method names | Supported | |
| 3.3.1. Basic customization | Partially Supported | Not supported: __new__ , __del__ , __bytes__ , __format__ , __hash__ , |
| 3.3.2. Customizing attribute access | Not Supported | |
| 3.3.2.1. Customizing module attribute access | Not Supported | |
| 3.3.2.2. Implementing Descriptors | Not Supported | |
| 3.3.2.3. Invoking Descriptors | Not Supported | |
| 3.3.2.4. __slots__ | Not Supported | |
| 3.3.2.4.1. Notes on using __slots__ | Not Supported | |
| 3.3.3. Customizing class creation | Not Supported | |
| 3.3.3.1. Metaclasses | Not Supported | |
| 3.3.3.2. Resolving MRO entries | Not Supported | super() is not supported |
| 3.3.3.3. Determining the appropriate metaclass | Not relevant | |
| 3.3.3.4. Preparing the class namespace | Not relevant | |
| 3.3.3.5. Executing the class body | Not relevant | |
| 3.3.3.6. Creating the class object | Not relevant | |
| 3.3.3.7. Uses for metaclasses | Not relevant | |
| 3.3.4. Customizing instance and subclass checks | Not Supported | |
| 3.3.5. Emulating generic types | Not Supported | |
| 3.3.6. Emulating callable objects | Supported | |
| 3.3.7. Emulating container types | Partially Supported | Some magic methods not supported (e.g. __iter__ ) |
| 3.3.8. Emulating numeric types | Partially Supported | Magic methods with swapped operands not supported (__r*__) |
| 3.3.9. With Statement Context Managers | Not Supported | |
| 3.3.10. Special method lookup | Not relevant | |
| 3.4. Coroutines | Not Supported | |
| 3.4.1. Awaitable Objects | Not Supported | |
| 3.4.2. Coroutine Objects | Not Supported | |
| 3.4.3. Asynchronous Iterators | Not Supported | |
| 3.4.4. Asynchronous Context Managers | Not Supported | |
| 4. Execution model | Not Relevant | |
| 4.1. Structure of a program | Not Relevant | |
| 4.2. Naming and binding | Not Relevant | Names are bound at compile time in TorchScript |
| 4.2.1. Binding of names | Not Relevant | See global and nonlocal statements section |
| 4.2.2. Resolution of names | Not Relevant | See global and nonlocal statements section |
| 4.2.3. Builtins and restricted execution | Not Relevant | |
| 4.2.4. Interaction with dynamic features | Not Supported | Python values cannot be captured |
| 4.3. Exceptions | Partially Supported | See try and raise statement section |
| 5. The import system | Not Relevant | |
| 6. Expressions | Not Relevant | See expressions section |
| 6.1. Arithmetic conversions | Supported | |
| 6.2. Atoms | Not Relevant | |
| 6.2.1. Identifiers (Names) | Supported | |
| 6.2.2. Literals | Partially Supported | bytesliteral, imagnumber not supported |
| 6.2.3. Parenthesized forms | Supported | |
| 6.2.4. Displays for lists, sets and dictionaries | Partially Supported | Not supported: comprehension ifs, async iterators |
| 6.2.5. List displays | Supported | |
| 6.2.6. Set displays | Not Supported | |
| 6.2.7. Dictionary displays | Supported | dict() constructor with kwargs doesn't work, dict comprehensions, dictionary unpacking |
| 6.2.8. Generator expressions | Not Supported | |
| 6.2.9. Yield expressions | Not Supported | |
| 6.2.9.1. Generator-iterator methods | Not Supported | |
| 6.2.9.2. Examples | Not Supported | |
| 6.2.9.3. Asynchronous generator functions | Not Supported | |
| 6.2.9.4. Asynchronous generator-iterator methods | Not Supported | |
| 6.3. Primaries | Supported | |
| 6.3.1. Attribute references | Supported | |
| 6.3.2. Subscriptions | Supported | |
| 6.3.3. Slicings | Partially Supported | Tuple slicing with stride is not supported |
| 6.3.4. Calls | Partially Supported | Args unpack / kwargs unpack is not supported |
| 6.4. Await expression | Not Supported | |
| 6.5. The power operator | Supported | |
| 6.6. Unary arithmetic and bitwise operations | Partially Supported | Some bitwise operators are not implemented for primitive types (e.g. ~x where x is an int is not currently supported) |
| 6.7. Binary arithmetic operations | Partially Supported | See delimiters section |
| 6.8. Shifting operations | Not Supported | |
| 6.9. Binary bitwise operations | Supported | |
| 6.10. Comparisons | Supported | |
| 6.10.1. Value comparisons | Partially Supported | Dictionary equality checks are not currently supported |
| 6.10.2. Membership test operations | Partially Supported | Not supported for TorchScript classes |
| 6.10.3. Identity comparisons | Supported | |
| 6.11. Boolean operations | Supported | |
| 6.12. Conditional expressions | Supported | |
| 6.13. Lambdas | Not Supported | |
| 6.14. Expression lists | Partially Supported | Iterable unpacking not supported |
| 6.15. Evaluation order | Supported | |
| 6.16. Operator precedence | Supported | |
| 7. Simple statements | Supported | |
| 7.1. Expression statements | Supported | |
| 7.2. Assignment statements | Supported | |
| 7.2.1. Augmented assignment statements | Partially Supported | See delimiters section |
| 7.2.2. Annotated assignment statements | Supported | |
| 7.3. The assert statement | Partially Supported | Exception message is not customizable |
| 7.4. The pass statement | Supported | |
| 7.5. The del statement | Not Supported | |
| 7.6. The return statement | Supported | Some other features of returning (e.g. behavior with try..finally) are unsupported |
| 7.7. The yield statement | Not Supported | |
| 7.8. The raise statement | Partially Supported | Exception message is not customizable |
| 7.9. The break statement | Supported | Some other features of returning (e.g. behavior with try..finally) are unsupported |
| 7.10. The continue statement | Supported | Some other features of returning (e.g. behavior with try..finally) are unsupported |
| 7.11. The import statement | Not Supported | |
| 7.11.1. Future statements | Not Supported | |
| 7.12. The global statement | Not Supported | |
| 7.13. The nonlocal statement | Not Supported | |
| 8. Compound statements | Irrelevant | |
| 8.1. The if statement | Supported | |
| 8.2. The while statement | Partially Supported | while..else is not supported |
| 8.3. The for statement | Partially Supported | for..else is not supported |
| 8.4. The try statement | Not Supported | |
| 8.5. The with statement | Supported | |
| 8.6. Function definitions | Not Supported | |
| 8.7. Class definitions | Not Supported | |
| 8.8. Coroutines | Not Supported | |
| 8.8.1. Coroutine function definition | Not Supported | |
| 8.8.2. The async for statement | Not Supported | |
| 8.8.3. The async with statement | Not Supported | |
| 9. Top-level components | Not Relevant | |
| 9.1. Complete Python programs | Not Relevant | |
| 9.2. File input | Not Relevant | |
| 9.3. Interactive input | Not Relevant | |
| 9.4. Expression input | Not Relevant |