mirror of
https://github.com/pocketpy/pocketpy
synced 2025-10-26 22:40:17 +00:00
154 lines
5.2 KiB
Markdown
154 lines
5.2 KiB
Markdown
---
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label: Virtual machine
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icon: dot
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order: 20
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---
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The `VM` class provides a sandboxed Python environment and a set of APIs for interacting with it.
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Using the namespace `PocketPython` before any operations.
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```csharp
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using PocketPython;
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```
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### Construction
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+ `VM()`
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Create a new Python virtual machine.
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### Code Execution
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+ `CodeObject Compile(string source, string filename, CompileMode mode)`
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Compile Python source code into a `CodeObject` that can be executed later.
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The `filename` parameter is used for error reporting, you can set it to `main.py` if you don't need it.
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The `mode` parameter specifies the compile mode, see [CompileMode](../quick-start/exec/#compile-mode) for details.
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+ `object Exec(CodeObject co, PyModule mod = null)`
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Execute a `CodeObject` in the given module.
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The `mod` parameter specifies the module in which the code will be executed.
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If it is `null`, the code will be executed in the main module.
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+ `object Exec(string source, string filename, CompileMode mode = CompileMode.EXEC_MODE, PyModule mod = null)`
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Compile and execute Python source code in the given module. It is equivalent to `Exec(Compile(source, filename, mode), mod)`.
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+ `object Eval(string source, PyModule mod = null)`
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Evaluate an expression in the given module.
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+ `object Call(object callable, object[] args, Dictionary<string, object> kwargs)`
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Call a Python callable object with the given arguments and keyword arguments. It is equivalent to `callable(*args, **kwargs)` in Python.
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+ `object CallMethod(object obj, string name, params object[] args)`
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Call a method of a Python object with the given arguments. It is equivalent to `obj.name(*args)` in Python.
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### Attribute Access
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+ `object GetAttr(object obj, string name, bool throwErr = true)`
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Get an attribute of a Python object. It is equivalent to `obj.name` in Python.
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If `throwErr` is `true`, it will throw an exception if the attribute does not exist.
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Otherwise, it will return `null`.
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+ `NoneType SetAttr(object obj, string name, object value)`
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Set an attribute of a Python object. It is equivalent to `obj.name = value` in Python.
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+ `bool HasAttr(object obj, string name)`
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Check if a Python object has the given attribute. It is equivalent to `hasattr(obj, name)` in Python.
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### Module Access
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+ `Dictionary<string, PyModule> modules`
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A dictionary that maps module names to `PyModule` objects.
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You can use it to access the modules that have been imported.
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+ `Dictionary<string, string> lazyModules`
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A dictionary stores all unimported modules. You can add Python source into this dictionary.
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It will be initialized and moved to `modules` when it is first imported.
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+ `PyModule NewModule(string name)`
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Create a new module with the given name at runtime. The module will be added to `modules` automatically.
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+ `PyModule PyImport(string name)`
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Import a Python module. It is equivalent to `import name` in Python. It first checks if the module has been imported, if not, it will try to load the module from `lazyModules`.
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### Type Conversion
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+ `T PyCast<T>(object obj)`
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Convert a Python object to a C# object. It is equivalent to `obj as T` in C#.
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Raise `TypeError` if the conversion fails.
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+ `bool IsInstance(object obj, PyTypeObject type)`
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Check if a Python object is an instance of the given type. It is equivalent to `isinstance(obj, type)` in Python.
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+ `void CheckType<T>(object t)`
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Check if `t is T`. Raise `TypeError` if the check fails.
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+ `bool PyEquals(object lhs, object rhs)`
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Check if two Python objects are equal. It is equivalent to `lhs == rhs` in Python. This is different from `==` or `object.ReferenceEquals` in C#. You should always use this method to compare Python objects.
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+ `object PyIter(object obj)`
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Get an iterator of a Python object. It is equivalent to `iter(obj)` in Python.
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+ `object PyNext(object obj)`
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Get the next element of a Python iterator. It is equivalent to `next(obj)` in Python.
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+ `bool PyBool(object obj)`
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Convert a Python object to a boolean value. It is equivalent to `bool(obj)` in Python.
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+ `string PyStr(object obj)`
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Convert a Python object to a string. It is equivalent to `str(obj)` in Python.
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+ `string PyRepr(object obj)`
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Convert a Python object to a string representation. It is equivalent to `repr(obj)` in Python.
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+ `int PyHash(object obj)`
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Get the hash value of a Python object. It is equivalent to `hash(obj)` in Python.
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+ `List<object> PyList(object obj)`
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Convert an `Iterable` Python object to a list. It is equivalent to `list(obj)` in Python.
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### Callbacks
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+ `System.Action<string> stdout = Debug.Log`
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A callback that will be called when the Python code invokes `print` function.
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By default, it will print the message to Unity console.
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+ `System.Action<string> stderr = null`
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A callback that will be called when the Python code emits an error message.
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By default, an Exception will be raised.
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You can set it to `Debug.LogError` for printing to the Unity Console.
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### Debug Flag
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+ `bool debug = false`
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A flag that controls whether to print debug messages to Unity console.
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You can set it to `true` to enable debug messages, or `false` to disable them.
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