Justbytes-GUI

justbytes_gui is a simple library for demonstrating the display options of the justbytes library.

There are a lot of display options, and it is a bit hard to remember all their keywords.

Usage

This library requires the justbytes library. It has one method, show(), which is invoked on a justbytes.Range object.

>>> from justbytes import *
>>> number = Range(32, GiB)
>>> from justbytes_gui import show
>>> show(number)

The show() method opens a GUI displaying the number according to the default options and allowing the user to experiment by changing the options.

The options are in two categories, those that may alter the value of the number or of the unit displayed, and those that only alter the appearance.

Value Options

• Base – the base in which the number is displayed. Ten is the most usual base, but the display options allow for any choice of base. Base 1000 is particularly useful when showing the value in SI units, base 1024 when showing the value in IEC units, since these choices of base also show the breakdown in sub-units.
• Units, IEC or SI – IEC units are base 1024, SI are base 1000.
• Exact Value – if this option is chosen, the highest units such that the resulting value is a whole number are chosen.
• Precision – the maximum number of digits to the right of the radix.
• Limit – a fraction, which multiplied by the appropriate factor for IEC or SI units, gives an upper limit on the size of the value to appear on the left of the radix. A choice of 1.0 with IEC units indicates that the value on the left of the radix must be strictly less than 1024 * 1.0.
• Rounding Method – there are a number of rounding methods, with self-explanatory names.
• Unit – if a particular unit, e.g., MB, is specified, this overrides other configuration operations.

Display Options

Display options are further grouped according to various categories.

Base Options

These options determine how the base of the number is indicated.

• Prefix – use one of the customary prefixes for either base 8 (0), or base 16 (0x).
• Subscript – use a subscript-like notation to indicate the base.

Digits Options

These options determine how the digits are displayed.

• Use Letters – use letters for digits with value larger than 9 in the customary way, i.e., a for 10, b for 11, and so forth.
• Use Capitals – this is only meaningful if already using letters, and causes upper-case instead of lower-case letters to be used.
• Separator – separator to separated digits from each other when other choices result in digits that require more than one character to represent.

Strip Options

These options control how trailing zeros are stripped.

• Strip All – strip all trailing zeros.
• Strip Exact – strip trailing zeros if the number displayed is exactly the same as the value it represents.
• Strip Whole – like Strip Exact, but add the further restriction that only zeros appear on the right side.

Miscellaneous Options

These options fall into no obvious grouping.

• Show Relation – indicate the relation of the value displayed to the value it represents.