Simple script to map java versions and java bytecode versions

java-bytecode.py

#!/usr/bin/env python3

RESET='\033[0m'
COLOR='\033[0;36m' # Cyan

# List from https://javaalmanac.io/bytecode/versions/
JAVA_TO_BYTECODE = {
    1.0: 45.0,
    1.1: 45.3,
    1.2: 46.0,
    1.3: 47.0,
    1.4: 48.0,
    5: 49.0,
    6: 50.0,
    7: 51.0,
    8: 52.0,
    9: 53.0,
    10: 54.0,
    11: 55.0,
    12: 56.0,
    13: 57.0,
    14: 58.0,
    15: 59.0,
    16: 60.0,
    17: 61.0,
    18: 62.0,
    19: 63.0,
    20: 64.0,
    21: 65.0,
    22: 66.0,
    23: 67.0,
    24: 68.0
}

BYTECODE_TO_JAVA = {v: k for k, v in JAVA_TO_BYTECODE.items()}

import sys

if len(sys.argv) == 1:
    for version in JAVA_TO_BYTECODE:
        print(f"{RESET}Java {COLOR}{version}{RESET}: bytecode version {COLOR}{JAVA_TO_BYTECODE[version]}")
else:
    try:
        arg = float(sys.argv[1])
    except ValueError:
        print(f"{RESET}Invalid number {COLOR}{sys.argv[1]}")
        exit(1)
    if arg in JAVA_TO_BYTECODE:
        print(f"{RESET}Java {COLOR}{arg}{RESET} bytecode version: {COLOR}{JAVA_TO_BYTECODE[arg]}")
    else:
        if arg in BYTECODE_TO_JAVA:
            print(f"{RESET}Java {COLOR}{BYTECODE_TO_JAVA[arg]}{RESET} bytecode version: {COLOR}{arg}")
        else:
            print(f"{RESET}Java version or bytecode version {COLOR}{sys.argv[1]}{RESET} not found")
            exit(1)