commit 72d823f561dd55eb56f8c6e79636c1ffbf92be92
Author: Julien Palard <julien@palard.fr>
Date:   Sun Oct 3 15:39:45 2021 +0200

    Initial.

diff --git a/README.md b/README.md
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+# Analysis of version adoptions on Pypi
+
+We get PyPI download statistics via Google's BigQuery using the
+[pypinfo](https://github.com/ofek/pypinfo/) tool.
+
+
+## Usage
+
+First you need to get an access to PyPI's BigQuery, by following
+[pypinfo](https://github.com/ofek/pypinfo/) procedure.
+
+Then there's two main invocations, first fetch the data using:
+
+    python python-versions.py --fetch
+
+Then plot it using:
+
+    python python-versions.py
+
+
+## Data
+
+
+![](python-versions.png)
diff --git a/python-versions.png b/python-versions.png
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diff --git a/python-versions.py b/python-versions.py
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+"""Module to fetch and graph adoption of Python releases.
+"""
+
+import calendar
+import sqlite3
+import sys
+from datetime import datetime, timedelta, date
+from collections import defaultdict
+
+from pypinfo.fields import PythonVersion
+from pypinfo.core import build_query, create_client, create_config, parse_query_result
+from pypinfo.db import get_credentials
+import matplotlib.pyplot as plt
+
+
+class DB:
+    def __init__(self):
+        self.connection = sqlite3.connect(
+            "python-versions.sqlite",
+            isolation_level=None,
+            detect_types=sqlite3.PARSE_COLNAMES,
+        )
+        self.connection.row_factory = sqlite3.Row
+        self.migrate()
+
+    def migrate(self):
+        self.connection.execute(
+            """CREATE TABLE IF NOT EXISTS python_version (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "start_date" TEXT NOT NULL,
+    "end_date" TEXT NOT NULL,
+    "python_version" TEXT NULL,
+    "download_count" INT NOT NULL);"""
+        )
+
+    def store_python_version(
+        self, start_date, end_date, python_version, download_count
+    ):
+        self.connection.execute(
+            "INSERT INTO python_version (start_date, end_date, python_version, download_count) VALUES (?, ?, ?, ?)",
+            (start_date, end_date, python_version, download_count),
+        )
+
+    def have_data_for_dates(self, start_date, end_date) -> bool:
+        return (
+            self.connection.execute(
+                "SELECT COUNT(1) FROM python_version WHERE start_date = ? AND end_date = ?",
+                (start_date, end_date),
+            ).fetchone()[0]
+            > 0
+        )
+
+    def fetch_python_version(self):
+        return self.connection.execute(
+            """
+  SELECT start_date as "start_date [date]",
+         end_date as "end_date [date]",
+         python_version,
+         download_count
+    FROM python_version
+ORDER BY start_date"""
+        ).fetchall()
+
+
+def query_python_versions(start_date: str, end_date: str) -> list[tuple[str, int]]:
+    built_query = build_query(
+        "",
+        [PythonVersion],
+        start_date=start_date,
+        end_date=end_date,
+    )
+
+    with create_client(get_credentials()) as client:
+        query_job = client.query(built_query, job_config=create_config())
+        query_rows = query_job.result(timeout=120)
+        return [tuple(row) for row in query_rows]
+
+
+def fetch_main():
+    db = DB()
+    today = date.today()
+    for year_in_the_past in 1, 0:
+        year = today.year - year_in_the_past
+        for month in range(1, 13):
+            start_date = date(year, month, 1)
+            end_date = start_date.replace(
+                day=calendar.monthrange(year, month)[1]
+            ) + timedelta(days=1)
+            if end_date > today:
+                continue
+            if db.have_data_for_dates(start_date, end_date):
+                continue
+            print(f"Querying BigTable in [{start_date}; {end_date}]")
+            results = query_python_versions(str(start_date), str(end_date))
+            for python_version, download_count in results:
+                db.store_python_version(
+                    start_date, end_date, python_version, download_count
+                )
+
+
+def plot_main():
+    db = DB()
+    by_version = defaultdict(dict)
+    for row in db.fetch_python_version():
+        by_version[row["python_version"]][row["start_date"]] = row["download_count"]
+    for version, data_points in by_version.items():
+        plt.plot(data_points.keys(), data_points.values(), label=version)
+    plt.xlabel("month")
+    plt.ylabel("pypi downloads")
+    plt.legend()
+    plt.savefig("python-versions.png")
+
+
+if __name__ == "__main__":
+    if "--fetch" in sys.argv:
+        fetch_main()
+    plot_main()
diff --git a/python-versions.sqlite b/python-versions.sqlite
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