display constant value; add number of zeros

src/skrubview/_data/templates/column-summary.html

@@ -11,15 +11,15 @@ <h3 class="skrubview-margin-r-t">
             <dl>
                 <dt>Null values</dt>
                 <dd class="skrubview-{{ column.nulls_level }}">{{ column.null_count }} ({{ column.null_proportion | format_percent }})</dd>
+                {% if not column.value_is_constant %}
                 {% if column.n_unique %}
                 <dt>Unique values</dt>
                 <dd>{{ column.n_unique }} ({{ column.unique_proportion | format_percent }})</dd>
                 {% endif %}
-
-                {% if column.value_is_constant %}
-                <dt>(constant) Value</dt>
-                <dd class=".skrubview-ellided">{{ column.constant_value.__repr__() }}</dd>
-                {% else %}
+                {% if column.n_zeros %}
+                <dt>Zeros</dt>
+                <dd>{{ column.n_zeros }} ({{ column.zeros_proportion | format_percent }})</dd>
+                {% endif %}
                 {% if "mean" in column %}
                 <dt>Mean ± Std</dt>
                 <dd>{{ column["mean"] | format_number }} ± {{ column["standard_deviation"] | format_number }}</dd>
@@ -48,6 +48,17 @@ <h3 class="skrubview-margin-r-t">
             </dl>
         </div>
 
+        {% if column.value_is_constant %}
+        {% set val_id = "{}-constant-value".format(col_id) %}
+        <div class="skrubview-margin-v-t">
+        <strong>Constant value:</strong>
+        <div class="skrubview-copybutton-grid">
+        <pre class="skrubview-box" id="{{ val_id }}">{{ column.constant_value }}</pre>
+        <button onclick='copyTextToClipboard("{{ val_id }}")'>📋</button>
+        </div>
+        </div>
+        {% endif %}
+
         {% for plot_name in column.plot_names %}
         <div>
         <img class="pure-img" src="{{ column[plot_name] | svg_to_img_src | safe }}" alt={{ plot_name }} />

src/skrubview/_summarize.py

@@ -1,6 +1,5 @@
 from pathlib import Path
 
-import numpy as np
 import polars as pl
 
 from . import _plotting, _utils
@@ -65,7 +64,11 @@ def _summarize_column(
         summary, column, dataframe_summary=dataframe_summary, with_plots=with_plots
     )
     _add_numeric_summary(
-        summary, column, with_plots=with_plots, order_by_column=order_by_column
+        summary,
+        column,
+        dataframe_summary=dataframe_summary,
+        with_plots=with_plots,
+        order_by_column=order_by_column,
     )
     _add_datetime_summary(summary, column, with_plots=with_plots)
     summary["plot_names"] = [k for k in summary.keys() if k.endswith("_plot")]
@@ -131,12 +134,16 @@ def _add_datetime_summary(summary, column, with_plots):
         )
 
 
-def _add_numeric_summary(summary, column, with_plots, order_by_column):
+def _add_numeric_summary(
+    summary, column, dataframe_summary, with_plots, order_by_column
+):
     ns = column.__column_namespace__()
     if not ns.is_dtype(_utils.get_dtype(column), "numeric"):
         return
     if not summary["high_cardinality"]:
         return
+    summary["n_zeros"] = int((column == 0).sum().scalar)
+    summary["zeros_proportion"] = summary["n_zeros"] / dataframe_summary["n_rows"]
     std = column.std().scalar
     summary["standard_deviation"] = float("nan") if std is None else float(std)
     summary["mean"] = float(column.mean())

src/skrubview/_text.py

@@ -74,7 +74,14 @@ def _print_column_summary(summary, console):
     text.append(f"[bold]{summary['dtype']}[/bold]\n")
     text.append("Null values: ")
     color = _COLORS[summary["nulls_level"]]
-    text.append(f"[{color}]{summary['null_proportion']:0.2%}[/{color}]\n")
+    text.append(
+        f"[{color}]{summary['null_count']} "
+        f"({summary['null_proportion']:0.2%})[/{color}]\n"
+    )
+    if "n_zeros" in summary:
+        text.append(
+            f"Zeros: {summary['n_zeros']} ({summary['zeros_proportion']:0.2%})\n"
+        )
     if "n_unique" in summary:
         text.append(f"Unique values: {summary['n_unique']}\n")
     if "value_counts" in summary: