Use Python 10 syntax for types

README.md

@@ -17,7 +17,7 @@ python3 clean_up_vcf.py --vcf input.vcf --info AC AN_nfe_est faf95 > output.vcf
 This command will remove all INFO fields from input.vcf except for AC, AN_nfe_est, and faf95, and will write the result to output.vcf.
 
 # Requirements
-To use clean-up-vcf, you need Python 3.9 or higher installed on your system.
+To use clean-up-vcf, you need Python 3.10 or higher installed on your system.
 
 # License
 This script is licensed under the MIT License. See LICENSE for more information.

clean_up_vcf.py

@@ -1,6 +1,6 @@
 import csv
 import argparse
-from typing import Tuple, Optional, Generator
+from typing import Generator
 
 CHROM = "#CHROM"
 INFO = "INFO"
@@ -14,15 +14,15 @@ def parse_info(info_content: str) -> dict[str, str]:
         )
     }
 
-def split(field: str) -> Tuple[str, Optional[str]]:
+def split(field: str) -> tuple[str, str | None]:
     """Splits a field by '=' if present, otherwise returns the field as a key with None value."""
     return (field, None) if "=" not in field else tuple(field.split("="))
 
-def to_pair(key: str, value: Optional[str]) -> str:
+def to_pair(key: str, value: str | None) -> str:
     """Formats a key-value pair into 'key=value', or just 'key' if value is None."""
     return f"{key}={value}" if key and value else key
 
-def get_info_pair_for_key(info: dict[str, str], key: str) -> Optional[str]:
+def get_info_pair_for_key(info: dict[str, str], key: str) -> str | None:
     """Retrieves a formatted pair for a given key if it exists in the info dictionary."""
     return to_pair(key, info.get(key)) if key in info else None
 

pyproject.toml

@@ -7,7 +7,7 @@ license = "MIT"
 readme = "README.md"
 
 [tool.poetry.dependencies]
-python = ">=3.9"
+python = ">=3.10"
 
 [tool.poetry.scripts]
 clean-up-vcf = "clean_up_vcf:main"