microsoft/qlib · error · NotImplementedError
Please implement the `calculate_value` method
Error message
Please implement the `calculate_value` method
What it means
Error "Please implement the `calculate_value` method" thrown in microsoft/qlib.
Source
Thrown at qlib/backtest/position.py:98
the id of the stock
price : float
the price to be updated
"""
raise NotImplementedError(f"Please implement the `update stock price` method")
def calculate_stock_value(self) -> float:
"""
calculate the value of the all assets except cash in the position
Returns
-------
float:
the value(money) of all the stock
"""
raise NotImplementedError(f"Please implement the `calculate_stock_value` method")
def calculate_value(self) -> float:
raise NotImplementedError(f"Please implement the `calculate_value` method")
def get_stock_list(self) -> List[str]:
"""
Get the list of stocks in the position.
"""
raise NotImplementedError(f"Please implement the `get_stock_list` method")
def get_stock_price(self, code: str) -> float:
"""
get the latest price of the stock
Parameters
----------
code :
the code of the stock
"""
raise NotImplementedError(f"Please implement the `get_stock_price` method")
View on GitHub (pinned to 79633dd950)
Solutions
- Implement the `calculate_value` method in your Position subclass before calling it.
- Use the built-in Position class which already implements `calculate_value`.
When it happens
Trigger: This error is raised at qlib/backtest/position.py:98 when the guard condition fails: "Please implement the `calculate_value` method". It triggers when the code path receives input or a state that violates the precondition checked at this point — e.g. an unimplemented abstract method being called, an unsupported argument type/value, or an invalid configuration. To avoid it, satisfy the documented precondition before this call: implement the required method in your subclass, or pass a supported value of the expected type as described by the message.
Common situations: See trigger scenarios.
AI-assisted analysis of microsoft/qlib@79633dd950 (2026-08-15).
Data as JSON: /api/errors/99ab9c5d99b790d9.
Report an issue: GitHub.