Python Qt5 Classes that Display and Parse Numbers using Standard Decimal Notation
Project description
Welcome to Standard Decimal Notation's documentation!
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Contents:
... module:: qsdn
platform:
Unix, Windows
synopsis:
This module allows for parsing, validation and production of
numeric literals, written with thousand separators through out
the number. Often underlying system libraries for working with
locales neglect to put thousand separators (commas) after the
decimal place or they sometimes use scientific notation. The
classes inherit from the Qt classes for making things less
complex.
Thousand separators in general will not always be commas but
instead will be different according to the locale settings. In
Windows for example, the user can set his thousand separator to any
character. Support for converting strings directly to Decimals and
from Decimals to strings is included.
Also, numbers are always expressed in standard decimal notation.
Care has been taken to overload all of the members in a way that is
consistent with the base class QLocale and QValidator.
This module requires PyQt5. It is presently only tested with
Microsoft Windows. Users from other platforms are invited to join
my team and submit pull-requests to ensure correct functioning. If
KDE and PyKDE are installed on your system, KDE's settings for
thousands separator and decimal symbol will be used. Otherwise the
system's locale settings will be used to determine these values.
class qsdn.Locale(_name=None, p_mandatory_decimals=Decimal('0'), p_maximum_decimals=Decimal('Infinity'))
For a Locale, locale:
Main benefit is numbers converted to a string are always
converted to standard decimal notation. And you control how
far numbers are written before they are truncated. Another
benefit is it works with decimal.Decimal numbers natively.
So numbers get converted directly from String to Decimal and
vice versa.
To construct one, you can supply a name of a locale and specify
the mandatory and maximum digits after the decimal point.
locale = Locale("en_US", 2, 3) locale.toString(4) is '4.00'
locale.toString(4.01) is '4.01' locale.toString(1/3) is '0.333'
To specify the language and script, pass in a QLocale to the
constructor: like this: qlocale = QLocale('en_US',
QLocale.Latin, QLocale.Spanish) sdnlocale = Locale(qlocale, 2,
3)
To get the Decimal of a string, s, use:
(d, ok) = locale.toDecimal(s, 10)
The value d is your decimal, and you should check ok before
you trust d.
To get the string representation use:
s = locale.toString(d)
All to* routines take a string, and an optional base. If the
base is set to zero, it will look at the first digits of the
number to determine base it should use. So, '013' will be
interpreted as 11 (as 0 indicates octal form) unless you set the
base to 10, in which as it will be interpreted as 13. You can
use '0x' to prefix hexadecimal numbers. Some developers don't
want to expose this programming concept to the users of thier
software. For those who don't specify the base explicitly as
10. As of 1.0.0, the base defaults to 10, because the new
behavior as of PyQt5 in the QLocale class is to always have the
base fixed as 10.
By default Locale will use the settings specified in your
default locale. This is guaranteed to be true for Mac OS,
Windows and KDE-GUIs.
static c()
Returns the C locale. In the C locale, to* routines will not
accept group separtors and do not produce them.
static setDefault(QLocale)
static system()
Returns the system default for Locale.
toDecimal(s, *, base=10)
This creates a decimal representation of s.
It returns an ordered pair. The first of the pair is the
Decimal number, the second of the pair indicates whether
the string had a valid representation of that number. You
should always check the second of the ordered pair before
using the decimal returned.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string
had a valid representation of that number. You should always
check the second of the ordered pair before using the number
returned.
note:
You may set another parameter, the base, so you can
interpret the string as 8 for octal, 16 for hex, 2 for
binary.
If base is set to 0, numbers such as '0777' will be
interpreted as octal. The string '0x33' will be interpreted
as hexadecimal and '777' will be interpreted as a decimal.
Like the other to* functions of QLocale as well as this class
Locale, interpret a
a string and parse it and return a Decimal. The base value
is used to determine what base to use. It is done this way so
this works like toLong, toInt, toFloat, etc... Leading and
trailing whitespace is ignored.
toDouble(s, *, base=10)
Parses the string s and returns a floating point value whose
string is s.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string had
a valid representation of that number. You should always check
the second of the ordered pair before using the number returned.
note:
You may set another parameter, the base, so you can
interpret the string as 8 for octal, 16 for hex, 2 for
binary.
If base is set to 0, numbers such as '0777' will be interpreted
as octal. The string '0x33' will be interpreted as hexadecimal
and '777' will be interpreted as a decimal.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string
had a valid representation of that number. You should always
check the second of the ordered pair before using the number
returned.
toFloat(s, *, base=10)
Parses the string s and returns a floating point value whose
string is s.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string had
a valid representation of that number. You should always check
the second of the ordered pair before using the number returned.
note:
You may set another parameter, the base, so you can
interpret the string as 8 for octal, 16 for hex, 2 for
binary.
If base is set to 0, numbers such as '0777' will be interpreted
as octal. The string '0x33' will be interpreted as hexadecimal
and '777' will be interpreted as a decimal.
toInt(s, *, base=10)
Parses the string s and returns an integer value whose string is
s.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string had
a valid representation of that number. You should always check
the second of the ordered pair before using the number returned.
note:
You may set another parameter, the base, so you can
interpret the string as 8 for octal, 16 for hex, 2 for
binary.
If base is set to 0, numbers such as '0777' will be interpreted
as octal. The string '0x33' will be interpreted as hexadecimal
and '777' will be interpreted as a decimal.
toLongLong(s, *, base=10)
Parses the string s and returns a floating point value whose
string is s.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string had
a valid representation of that number. You should always check
the second of the ordered pair before using the number returned.
note:
You may set another parameter, the base, so you can
interpret the string as 8 for octal, 16 for hex, 2 for
binary.
If base is set to 0, numbers such as '0777' will be interpreted
as octal. The string '0x33' will be interpreted as hexadecimal
and '777' will be interpreted as a decimal.
Leading and trailing whitespace is ignored.
toShort(s, *, base=10)
Parses the string s and returns a short value whose string is s.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string had
a valid representation of that number. You should always check
the second of the ordered pair before using the number returned.
note:
You may set another parameter, the base, so you can
interpret the string as 8 for octal, 16 for hex, 2 for
binary.
If base is set to 0, numbers such as '0777' will be interpreted
as octal. The string '0x33' will be interpreted as hexadecimal
and '777' will be interpreted as a decimal.
Leading and trailing whitespace is ignored.
toString(x, arg2=None, arg3=None)
Convert any given Decimal, double, Date, Time, int or long to a
string.
Numbers are always converted to Standard decimal notation. That
is to say, numbers are never converted to scientifc notation.
The way toString is controlled: If passing a decimal.Decimal
typed value, the precision is recorded in the number itself.
So, D('4.00') will be expressed as '4.00' and not '4'. D('4')
will be expressed as '4'.
When a number passed is NOT a Decimal, numbers are created in
the following way: Two extra parameters, set during creation of
the locale, determines how many digits will appear in the
result of toString(). For example, we have a number like 5.1 and
mandatory decimals was set to 2, toString(5.1) should return
'5.10'. A number like 6 would be '6.00'. A number like 5.104
would depend on the maximum decimals setting, also set at
construction of the locale: _maximum_decimals controls the
maximum number of decimals after the decimal point So, if
_maximum_decimals is 6 and _mandatory_decimals is 2 then
toString(3.1415929) is '3.141,592'. Notice the number is
truncated and not rounded. Consider rounding a copy of the
number before displaying.
toUInt(s, *, base=10)
Parses the string s and returns an unsigned integer value whose
string is s.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string had
a valid representation of that number. You should always check
the second of the ordered pair before using the number returned.
note:
You may set another parameter, the base (which defaults to
10), so you can interpret the string as 8 for octal, 16
for hex, 2 for binary.
If base is set to 0, numbers such as '0777' will be interpreted
as octal. The string '0x33' will be interpreted as hexadecimal
and '777' will be interpreted as a decimal.
Leading and trailing whitespace is ignored.
toULongLong(s, base=10)
Parses the string s and returns an unsigned long long value
whose string is s.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string had
a valid representation of that number. You should always check
the second of the ordered pair before using the number returned.
note:
You may set another parameter, the base, so you can
interpret the string as 8 for octal, 16 for hex, 2 for
binary.
If base is set to 0, numbers such as '0777' will be interpreted
as octal. The string '0x33' will be interpreted as hexadecimal
and '777' will be interpreted as a decimal.
Leading and trailing whitespace is ignored.
toUShort(s, base=10)
Parses the string s and returns a unsigned long long value whose
string is s.
It returns an ordered pair. The first of the pair is the
number, the second of the pair indicates whether the string had
a valid representation of that number. You should always check
the second of the ordered pair before using the number returned.
note:
You may set another parameter, the base, so you can
interpret the string as 8 for octal, 16 for hex, 2 for
binary.
If base is set to 0, numbers such as '0777' will be interpreted
as octal. The string '0x33' will be interpreted as hexadecimal
and '777' will be interpreted as a decimal.
Leading and trailing whitespace is ignored.
class qsdn.NumericValidator(parent=None)
NumericValidator allows for numbers of any length but
groupSeparators are added or corrected when missing or out of
place.
U.S. dollar amounts;
dollar = NumericValidator(6,2) s = '42.1'
dollar.validate(s='42.1', 2) => s = '42.10' s='50000'
dollar.toString(s) => s = ' 50,000.00'
locale()
get the locale used by this validator
setLocale(plocale)
Set the locale used by this Validator.
validate(self, str, int) -> Tuple[QValidator.State, str, int]
class qsdn.LimitingNumericValidator(maximum_decamals=1000, maximum_decimals=1000, use_space=False, parent=None)
NumericValidator limits the number of digits after the decimal
point and the number of digits before.
bitcoin :
NumericValidator(8, 8) US dollars less than $1,000,000 :
NumericValidator(6, 2)
If use space is true, spaces are added on the left such that the
location of decimal point remains constant. Numbers like
'10,000.004', '102.126' become aligned. Bitcoin amounts:
' 0.004,3' ' 10.4' ' 320.0' '
0.000,004'
U.S. dollar amounts;
dollar = NumericValidator(6,2) s = '42.1'
dollar.validate(s='42.1', 2) => s = ' 42.10'
s='50000' dollar.toString(s) => s = '
50,000.00'
decamals()
gets the number of decimal digits that are allowed **before**
the decimal point (apart from spaces)
decimals()
gets the number of decimal digits that are allowed *after* the
decimal point
locale()
get the locale used by this validator
setDecamals(i)
sets the number of decimal digits that should be allowed
**before** the decimal point
setDecimals(i)
sets the number of decimal digits that should be allowed
**after** the decimal point
setLocale(plocale)
Set the locale used by this Validator.
validate(s, pos)
Validates s, by adjusting the position of the commas to be in
the correct places and adjusting pos accordingly as well as
space in order to keep decimal points aligned when varying sized
numbers are put one above the other.
Indices and tables
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