Rust-like error handling in Python, with type-safety in mind.
Project description
poltergeist
Rust-like error handling in Python, with type-safety in mind.
Installation
pip install poltergeist
Examples
Use the provided @poltergeist
decorator on any function:
from pathlib import Path
from poltergeist import Err, Ok, Result, poltergeist
# Wrap a function to handle a concrete exception type (Exception by default)
@poltergeist(error=OSError)
def read_text(path: Path) -> str:
return path.read_text()
# Now the function returns an object of type Result[str, OSError]
result = read_text(Path("test.txt"))
Or wrap errors manually:
def read_text(path: Path) -> Result[str, OSError]:
try:
return Ok(path.read_text())
except OSError as e:
return Err(e)
Then handle the result:
# Get the contained Ok value or raise the contained Err exception
content = result.unwrap()
# Get the contained Ok value or a default value
content = result.unwrap_or("default text")
content = result.unwrap_or() # default None
# Get the contained Ok value or compute it from a callable
content = result.unwrap_or_else(lambda e: f"The exception was: {e}")
# Get the contained Err exception or None
err = result.err()
# Handle errors using structural pattern matching
match result:
case Ok(content):
print("File content in upper case:", content.upper())
case Err(e):
match e:
case FileNotFoundError():
print("File not found:", e.filename)
case PermissionError():
print("Permission error:", e.errno)
case _:
raise e
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