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epython's Issues

Argument counts are not validated 

def add(a, b):
    print(a + b)

add(1, 2, 3)

This prints 3, when it should error.

Additionally:

def a(x, y):
        print(x * 1)

a(3)

This also prints 3.

Import system

Adding an import system is important, due to it being one of python's biggest strengths.

  • Basic module support (variables, functions, ...)
  • Module-specific variables (__name__, ...)
  • Builtin modules (math, ...)
  • OS-specific modules (os, sys, ...)

Exception handling

Exception handling is a pretty key concept. This is a tracking issue for everything related to it.

  • Being able to throw exceptions and unwind the stack
  • try/except statements
  • Exception objects and hierachy
  • User-defined exceptions

Crash on // division 

** (KeyError) key :pc not found in: %EPython.InterpreterState{next_id: 0, objects: %{}, refcounts: %{}, topframe: %EPython.PyFrame{blocks: [], code: [argcount: 2, kwonlyargcount: 0, nlocals: 2, stacksize: 3, flags: 67, code: <<116, 0, 124, 0, 124, 1, 26, 0, 131, 1, 1, 0, 100, 0, 83, 0>>, consts: {:none}, names: {"print"}, varnames: {"x", "y"}, freevars: {}, cellvars: {}, filename: "test.py", name: "a", firstlineno: 1, lnotab: <<0, 1>>], pc: 8, previous_frame: %EPython.PyFrame{blocks: [], code: [argcount: 0, kwonlyargcount: 0, nlocals: 0, stacksize: 3, flags: 64, code: <<100, 0, 100, 1, 132, 0, 90, 0, 101, 0, 100, 2, 100, 3, 131, 2, 1, 0, 100, 4, 83, 0>>, consts: {[argcount: 2, kwonlyargcount: 0, nlocals: 2, stacksize: 3, flags: 67, code: <<116, 0, 124, 0, 124, 1, 26, 0, 131, 1, 1, 0, 100, 0, 83, 0>>, consts: {:none}, names: {"print"}, varnames: {"x", "y"}, freevars: {}, cellvars: {}, filename: "test.py", name: "a", firstlineno: 1, lnotab: <<0, 1>>], "a", 1, 2, :none}, names: {"a"}, varnames: {}, freevars: {}, cellvars: {}, filename: "test.py", name: "<module>", firstlineno: 1, lnotab: <<8, 3>>], pc: 16, previous_frame: nil, stack: [], variables: %{"a" => %EPython.PyUserFunction{code: [argcount: 2, kwonlyargcount: 0, nlocals: 2, stacksize: 3, flags: 67, code: <<116, 0, 124, 0, 124, 1, 26, 0, 131, 1, 1, 0, 100, 0, 83, 0>>, consts: {:none}, names: {"print"}, varnames: {"x", "y"}, freevars: {}, cellvars: {}, filename: "test.py", name: "a", firstlineno: 1, lnotab: <<0, 1>>], name: "a"}}}, stack: [0.0, %EPython.PyBuiltinFunction{function: #Function<0.22053186/2 in EPython.Interpreter.builtins/0>, name: "print"}], variables: %{"x" => 1, "y" => 2}}}
    (epython) lib/epython/interpreter.ex:163: EPython.Interpreter.execute_instructions/1
    (elixir) lib/kernel/cli.ex:105: anonymous fn/3 in Kernel.CLI.exec_fun/2

Code:

print(3 // 2)

Proper function making/calls

Currently function calls are limited to positionary arguments with no default values. Here are some features that need to be implemented:

  • Default arguments
  • Keyword arguments
  • Variadic positional arguments
  • Variadic keyword arguments

Hard crash handling

(Note: A hard crash is when the interpreter crashes, rather than the Python code crashing.)

It might be useful to print the line of CPython bytecode, the line of Python code, and stack/frames in the case of an unhandled interpreter crash.

OO support

OO support is a critical part of Python.

  • Basic object support (classes)
  • Magic class methods (__init__ etc)
  • Types
  • First-class object support (everything is an object)
  • Slotted objects

And so on.

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