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Python Language Reference Coverage

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

Partially Supported

__exit__ is always called with exc_type, exc_value, and traceback set to None, even if an exception was raised, and __exit__’s return value is ignored.

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

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