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ArbitraryModel

class ArbitraryModel(BaseModel)
Empty Pydantic model with a config that allows arbitrary types.

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Stack

class Stack(List[T])

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empty

def empty() -> bool
Tests if this stack is empty.

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peek

def peek() -> Optional[T]
Looks at the object at the top (last/most recently added) of this stack without removing it from the stack.

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pop

def pop() -> Optional[T]
Removes the object at the top of this stack and returns that object as the value of this function.

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push

def push(item: T) -> None
Pushes an item onto the top of this stack. Proxy of List.append 
def search(x: T) -> Optional[int]
Returns the 0-based position of the last item whose value is equal to x on this stack. We deviate from the typical 1-based position used by Stack classes (i.e. Java) because most python users (and developers in general) are accustomed to 0-based indexing.

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at

def at(index: int, default: Optional[T] = None) -> Optional[T]
Returns the item located at the index. If the index does not exist in the stack (Overflow or Underflow), None is returned instead.

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copy

def copy() -> "Stack[T]"
Returns a copy of the current Stack.

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first

@property
def first() -> Optional[T]
Returns the first item of the stack without removing it. Same as Stack.bottom.

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last

@property
def last() -> Optional[T]
Returns the last item of the stack without removing it. Same as Stack.top.

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bottom

@property
def bottom() -> Optional[T]
Returns the item on the bottom of the stack without removing it. Same as Stack.first.

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top

@property
def top() -> Optional[T]
Returns the item on the top of the stack without removing it. Same as Stack.last.

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length

@property
def length() -> int
Returns the number of items in the Stack.