Merge pull request #202 from weka-io/percentage-unit

units: added a Percentage unit, with the appropriate rendering

Author: koreno

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- units: Added a Percentage class
+
+
 ## [0.3.1] - 2019-07-30
 
 ### Added

easypy/units.py

@@ -5,6 +5,30 @@
 from easypy.exceptions import TException
 
 
+class Percentage(float):
+
+    def __repr__(self):
+        return "{:.1f}%".format(self * 100)
+
+    def __format__(self, spec):
+        width, precision, name = re.match(r"(?:(\d+))?(?:\.(\d*))?(\w+)?", spec).groups()
+        precision = int(precision) if precision else 1
+        if name in ("f", None):
+            ret = "{:.{precision}f}%".format(self * 100, precision=precision)
+        elif name == "d":
+            ret = "{}%".format(round(self * 100))
+        return "{:>{width}}".format(ret, width=width or "")
+
+    def _repr_pretty_(self, p, cycle):
+        # used by IPython
+        from easypy.colors import MAGENTA
+        from easypy.humanize import vertbar
+        if cycle:
+            p.text('Percentage(...)')
+            return
+        p.text(MAGENTA("{1}:{0!r}".format(self, vertbar(self))))
+
+
 class UnknownDataSizeError(TException):
     template = 'Could not parse size {}'