Not identical functionality, but still, just saying.

============================== Java ==============================

    private ItemType(int id, short defaultData, short maxData, boolean supportsData, byte maxStack, String textureName)
    {
        this.id = id;
        this.defaultData = defaultData;
        this.maxData = maxData;
        this.supportsData = supportsData;
        this.maxStack = maxStack;
        this.textureName = textureName;
    }

    private ItemType(int id, short maxData, boolean supportsData, byte maxStack, String textureName)
    {
        this(id, supportsData ? 0 : maxData, maxData, supportsData, maxStack, textureName);
    }

    private ItemType(int id, boolean supportsData, byte maxStack, String textureName)
    {
        this(id, (short) 0, supportsData ? Short.MAX_VALUE : 0, supportsData, maxStack, textureName);
    }

    private ItemType(int id, byte maxStack, String textureName)
    {
        this(id, (short) 0, Short.MAX_VALUE, true, maxStack, textureName);
    }

    private ItemType(int id, short defaultData, short maxData, byte maxStack, String textureName)
    {
        this(id, defaultData, maxData, false, maxStack, textureName);
    }

    private ItemType(int id, short defaultData, byte maxStack, String textureName)
    {
        this(id, defaultData, defaultData, false, maxStack, textureName);
    }

    private ItemType(int id, short defaultData, short maxData, boolean supportsData, String textureName)
    {
        this(id, defaultData, maxData, supportsData, (byte) 64, textureName);
    }

    private ItemType(int id, short maxData, boolean supportsData, String textureName)
    {
        this(id, (short) 0, maxData, supportsData, (byte) 64, textureName);
    }

    private ItemType(int id, boolean supportsData, String textureName)
    {
        this(id, (short) 0, Short.MAX_VALUE, supportsData, (byte) 64, textureName);
    }

    private ItemType(int id, String textureName)
    {
        this(id, (short) 0, Short.MAX_VALUE, true, (byte) 64, textureName);
    }

============================== Python ==============================

    def __init__(self, id, defaultData=0, maxData=32767, supportsData=False, maxStack=64, textureName)
    {
        self.id = id;
        self.defaultData = defaultData;
        self.maxData = maxData;
        self.supportsData = supportsData;
        self.maxStack = maxStack;
        self.textureName = textureName;
    }