from — Intermediate Playground

Used with import to bring in specific names from a module

Python Playground

class ConfigError(Exception):
    pass

def load_config(path):
    try:
        raise FileNotFoundError(f"No file: {path}")
    except FileNotFoundError as e:
        raise ConfigError("Failed to load config") from e

try:
    load_config("settings.yaml")
except ConfigError as e:
    print(f"Error: {e}")
    print(f"Cause: {e.__cause__}")
    print(f"Cause type: {type(e.__cause__).__name__}")

# Suppress context with 'from None'
def clean_error():
    try:
        int("abc")
    except ValueError:
        raise TypeError("Expected numeric string") from None

try:
    clean_error()
except TypeError as e:
    print(f"\nClean error: {e}")
    print(f"Cause: {e.__cause__}")
    print(f"Context suppressed: {e.__suppress_context__}")

Output

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'raise X from Y' sets __cause__ for clear error chains. 'raise X from None' suppresses the implicit chaining context.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

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