Add PRs merged over time.

Author: rossbar

site/numpy_timeseries.md

@@ -247,3 +247,76 @@ first_commenter_tab.sort_values(
     "# of times commented first", ascending=False
 ).head(10)
 ```
+
+## Pull Requests
+
+```{code-cell} ipython3
+---
+tags: [hide-input]
+---
+
+with open("../_data/prs.json", "r") as fh:
+    data = json.loads(fh.read())
+```
+
+A look at merged PRs over time.
+
+```{code-cell} ipython3
+---
+tags: [hide-input]
+---
+# All contributors
+
+merged_prs = [d for d in data if d['node']['state'] == 'MERGED']
+merge_dates = np.array([r['node']['mergedAt'] for r in merged_prs], dtype=np.datetime64)
+binsize = np.timedelta64(30, "D")
+date_bins = np.arange(merge_dates[0], merge_dates[-1], binsize)
+h_all, bedges = np.histogram(merge_dates, date_bins)
+bcenters = bedges[:-1] + binsize / 2
+smoothing_interval = 4  # in units of bin-width
+
+# First-time contributors
+first_time_contributor = []
+prev_contrib = set()
+for record in merged_prs:
+    try:
+        author = record['node']['author']['login']
+    except TypeError:  # Author no longer has GitHub account
+        first_time_contributor.append(None)
+        continue
+    if author not in prev_contrib:
+        first_time_contributor.append(True)
+        prev_contrib.add(author)
+    else:
+        first_time_contributor.append(False)
+# Object dtype for handling None
+first_time_contributor = np.array(first_time_contributor, dtype=object)
+# Focus on first time contributors
+ftc_mask = first_time_contributor == True
+ftc_dates = merge_dates[ftc_mask]
+
+h_ftc, bedges = np.histogram(ftc_dates, date_bins)
+
+fig, axes = plt.subplots(1, 2, figsize=(16, 8))
+for ax, h, whom in zip(
+    axes.ravel(), (h_all, h_ftc), ("all contributors", "first-time contributors")
+):
+    ax.bar(bcenters, h, width=binsize, label="Raw")
+    ax.plot(
+        bcenters,
+        np.convolve(h, np.ones(smoothing_interval), 'same') / smoothing_interval,
+        label=f"{binsize * smoothing_interval} moving average",
+        color='tab:orange',
+        linewidth=2.0,
+    )
+ 
+    ax.set_title(f'{whom}')
+    ax.legend()
+
+fig.suptitle("Merged PRs from:")
+axes[0].set_xlabel('Time')
+axes[0].set_ylabel(f'# Merged PRs / {binsize} interval')
+axes[1].set_ylim(axes[0].get_ylim())
+fig.autofmt_xdate()
+plt.show()
+```