Adding @stefanv's mergeable PR analysis.

Co-authored-by: Stefan van der Walt <stefanv@berkeley.edu>.

Author: rossbar

site/numpy_timeseries.md

@@ -21,6 +21,7 @@ tags: [remove-cell]
 import json
 import functools
 import datetime
+from dateutil.parser import isoparse
 import warnings
 
 import numpy as np
@@ -325,3 +326,44 @@ axes[1].set_ylim(axes[0].get_ylim())
 fig.autofmt_xdate()
 plt.show()
 ```
+
+### Mergeability of Open PRs
+
+```{code-cell} ipython3
+---
+tags: [hide-input]
+---
+open_prs = [pr for pr in prs if pr["state"] == "OPEN"]
+
+# The GraphQL query does not reliably return information on PR mergeability.
+# Warn if there are problems
+if any([pr["mergeable"] == "UNKOWN" for pr in open_prs]):
+    warnings.warn(
+        (
+            "\n\nThe data contains PRs with unknown merge status.\n"
+            "Please re-download the data to get accurate info about PR mergeability.",
+        ),
+        UserWarning,
+        stacklevel=2,
+    )
+
+conflicting_prs = [isoparse(pr["createdAt"]) for pr in open_prs if pr["mergeable"] == "CONFLICTING"]
+mergeable_prs = [isoparse(pr["createdAt"]) for pr in open_prs if pr["mergeable"] == "MERGEABLE"]
+
+fig, ax = plt.subplots(figsize=(6, 4))
+ax.hist(
+    [conflicting_prs, mergeable_prs],
+    bins="auto",
+    histtype="bar",
+    label=("conflicting", "mergeable"),
+    color=("tab:red", "tab:blue"),
+)
+ax.legend()
+ax.set_xlabel("Date of PR creation")
+ax.set_ylabel(r"# of conflicting PRs")
+fig.autofmt_xdate()
+fig.tight_layout()
+```
+
+
+```