Add moneyfmt example from https://docs.python.org/3/library/decimal.html#recipes

examples/udecimal_moneyfmt.py

@@ -0,0 +1,67 @@
+# SPDX-FileCopyrightText: © 2004 Python Software Foundation. <https://www.python.org/psf/>
+#
+# SPDX-License-Identifier: Python-2.0
+# All rights reserved.
+
+# pylint: disable=redefined-builtin,too-many-arguments,too-many-locals
+
+from jepler_udecimal import Decimal
+
+
+def moneyfmt(value, places=2, curr="", sep=",", dp=".", pos="", neg="-", trailneg=""):
+    """Convert Decimal to a money formatted string.
+
+    places:  required number of places after the decimal point
+    curr:    optional currency symbol before the sign (may be blank)
+    sep:     optional grouping separator (comma, period, space, or blank)
+    dp:      decimal point indicator (comma or period)
+             only specify as blank when places is zero
+    pos:     optional sign for positive numbers: '+', space or blank
+    neg:     optional sign for negative numbers: '-', '(', space or blank
+    trailneg:optional trailing minus indicator:  '-', ')', space or blank
+
+    >>> d = Decimal('-1234567.8901')
+    >>> moneyfmt(d, curr='$')
+    '-$1,234,567.89'
+    >>> moneyfmt(d, places=0, sep='.', dp='', neg='', trailneg='-')
+    '1.234.568-'
+    >>> moneyfmt(d, curr='$', neg='(', trailneg=')')
+    '($1,234,567.89)'
+    >>> moneyfmt(Decimal(123456789), sep=' ')
+    '123 456 789.00'
+    >>> moneyfmt(Decimal('-0.02'), neg='<', trailneg='>')
+    '<0.02>'
+
+    """
+    q = Decimal(10) ** -places  # 2 places --> '0.01'
+    sign, digits, _ = value.quantize(q).as_tuple()
+    result = []
+    digits = list(map(str, digits))
+    build, next = result.append, digits.pop
+    if sign:
+        build(trailneg)
+    for i in range(places):
+        build(next() if digits else "0")
+    if places:
+        build(dp)
+    if not digits:
+        build("0")
+    i = 0
+    while digits:
+        build(next())
+        i += 1
+        if i == 3 and digits:
+            i = 0
+            build(sep)
+    build(curr)
+    build(neg if sign else pos)
+    return "".join(reversed(result))
+
+
+if __name__ == "__main__":
+    d = Decimal("-1234567.8901")
+    print(moneyfmt(d, curr="$"))
+    print(moneyfmt(d, places=0, sep=".", dp="", neg="", trailneg="-"))
+    print(moneyfmt(d, curr="$", neg="(", trailneg=")"))
+    print(moneyfmt(Decimal(123456789), sep=" "))
+    print(moneyfmt(Decimal("-0.02"), neg="<", trailneg=">"))