sys imported by unused.

cy.py

@@ -1,18 +0,0 @@
-from cycler import cycler
-import numpy as np
-import matplotlib.pyplot as plt
-
-x = np.linspace(0, 2 * np.pi, 50)
-offsets = np.linspace(0, 2 * np.pi, 4, endpoint=False)
-yy = np.transpose([np.sin(x + phi) for phi in offsets])
-
-
-plt.rc("axes", prop_cycle=cycler(linestyle=["-", "--", ":", "-."]))
-
-# fig, (ax0, ax1) = plt.subplots(nrows=2)
-plt.plot(yy)
-# ax0.set_title("Set default color cycle to rgby")
-
-# Add a bit more space between the two plots.
-# fig.subplots_adjust(hspace=0.3)
-plt.show()

python-versions.py

@@ -1,9 +1,9 @@
 """Module to fetch and graph adoption of Python releases.
 """
 
+import argparse
 import calendar
 import sqlite3
-import sys
 from datetime import datetime, timedelta, date
 from collections import defaultdict
 from itertools import cycle, count
@@ -188,8 +188,19 @@ def plot_pct():
     plt.savefig("python-versions-pct.png")
 
 
+def parse_args():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "--fetch",
+        action="store_true",
+        help="Fetch more data instead of just displaying them",
+    )
+    return parser.parse_args()
+
+
 if __name__ == "__main__":
-    if "--fetch" in sys.argv:
+    args = parse_args()
+    if args.fetch:
         fetch_main()
     plot_pct()
     plot_main()

requirements.txt

@@ -0,0 +1,4 @@
+pandas
+pypinfo
+matplotlib
+scipy