csvstat: Add a "Most decimal places" statistic and --max-precision op…

…tion, wireservice/agate-sql#43

CHANGELOG.rst

@@ -4,7 +4,9 @@ Unreleased
 * :doc:`/scripts/csvstat` adds a :code:`--json` option to output results as JSON text.
 * :doc:`/scripts/csvstat` adds an :code:`--indent` option to indent the JSON text when :code:`--json` is set.
 * :doc:`/scripts/csvstat` reports a "Non-null values" statistic (or a :code:`nonnulls` column when :code:`--csv` is set).
+* :doc:`/scripts/csvstat` reports a "Most decimal places" statistic (or a :code:`maxprecision` column when :code:`--csv` is set).
 * :doc:`/scripts/csvstat` adds a :code:`--non-nulls` option to only output counts of non-null values.
+* :doc:`/scripts/csvstat` adds a :code:`--max-precision` option to only output the most decimal places.
 * feat: Add a :code:`--null-value` option to commands with the :code:`--blanks` option, to convert additional values to NULL.
 * Add Python 3.12 support.
 

csvkit/utilities/csvstat.py

@@ -56,6 +56,10 @@
         'aggregation': agate.MaxLength,
         'label': 'Longest value: ',
     }),
+    ('maxprecision', {
+        'aggregation': agate.MaxPrecision,
+        'label': 'Most decimal places: ',
+    }),
     ('freq', {
         'aggregation': None,
         'label': 'Most common values: ',
@@ -117,6 +121,9 @@ def add_arguments(self):
         self.argparser.add_argument(
             '--len', dest='len_only', action='store_true',
             help='Only output the length of the longest values.')
+        self.argparser.add_argument(
+            '--max-precision', dest='maxprecision_only', action='store_true',
+            help='Only output the most decimal places.')
         self.argparser.add_argument(
             '--freq', dest='freq_only', action='store_true',
             help='Only output lists of frequent values.')