ci: run black linter

.github/workflows/ci.yaml

@@ -0,0 +1,25 @@
+name: lint
+on: [push, pull_request]
+jobs:
+  run-linters:
+    name: Run linters
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+
+      - name: Install Python dependencies
+        run: pip install black flake8
+
+      - name: Run linters
+        uses: wearerequired/lint-action@v2
+        with:
+          auto_fix: false
+          black: true
+          flake8: false

hadcrut5-bars.py

@@ -11,40 +11,54 @@
 
 from hadcrut5lib import argparser, HadCRUT5
 
+
 def parse_args():
     """This function parses and return arguments passed in"""
     descr = "Parse and plot the HadCRUT5 temperature datasets"
     examples = [
-       "%(prog)s",
-       "%(prog)s --period \"1850-1900\"",
-       "%(prog)s --period \"1880-1920\"",
-       "%(prog)s --outfile HadCRUT5-global.png"]
+        "%(prog)s",
+        '%(prog)s --period "1850-1900"',
+        '%(prog)s --period "1880-1920"',
+        "%(prog)s --outfile HadCRUT5-global.png",
+    ]
 
     parser = argparser(descr, examples)
     parser.add_argument(
-        "-f", "--outfile",
-        action="store", dest="outfile",
-        help="name of the output PNG file")
+        "-f",
+        "--outfile",
+        action="store",
+        dest="outfile",
+        help="name of the output PNG file",
+    )
     parser.add_argument(
-        "-p", "--period",
-        action="store", dest="period", default="1961-1990",
-        help="show anomalies related to 1961-1990 (default), 1850-1900, or 1880-1920")
+        "-p",
+        "--period",
+        action="store",
+        dest="period",
+        default="1961-1990",
+        help="show anomalies related to 1961-1990 (default), 1850-1900, or 1880-1920",
+    )
     parser.add_argument(
-        "-v", "--verbose",
+        "-v",
+        "--verbose",
         action="store_true",
         dest="verbose",
-        help="make the operation more talkative")
+        help="make the operation more talkative",
+    )
 
     return parser.parse_args()
 
+
 def plotbar(period, outfile, verbose):
     """
     Create a bar plot for the specified period and diplay it or save it to file
     if outfile is set
     """
+
     # pylint: disable=W0613
     def major_formatter(x, pos):
-        return f'{x:.1f}' if x >= 0 else ''
+        return f"{x:.1f}" if x >= 0 else ""
+
     # pylint: enable=W0613
 
     hc5 = HadCRUT5(period=period, verbose=verbose)
@@ -57,67 +71,72 @@ def major_formatter(x, pos):
 
     bar_width = 0.7
     basefont = {
-        'family': 'DejaVu Sans',
-        'color' : 'white',
-        'weight': 'bold',
+        "family": "DejaVu Sans",
+        "color": "white",
+        "weight": "bold",
     }
-    fontxl = { **basefont, "size": 20 }
-    fontxs = { **basefont, "size": 12 }
+    fontxl = {**basefont, "size": 20}
+    fontxs = {**basefont, "size": 12}
 
     plt.style.use("dark_background")
     _, ax = plt.subplots()
 
-    cmap = plt.cm.jet # or plt.cm.bwr
+    cmap = plt.cm.jet  # or plt.cm.bwr
     norm = matplotlib.colors.Normalize(vmin=-1, vmax=max(mean))
     colors = cmap(norm(mean))
 
-    ax.bar(years,
-           mean,
-           width=bar_width,
-           color=colors,
-           align="center")
+    ax.bar(years, mean, width=bar_width, color=colors, align="center")
 
     ax.set_frame_on(False)
     ax.yaxis.tick_right()
     ax.yaxis.set_major_formatter(major_formatter)
-    ax.tick_params(axis=u'both', which=u'both',length=0)
+    ax.tick_params(axis="both", which="both", length=0)
 
-    upper, left = .95, .025
+    upper, left = 0.95, 0.025
     last_year = years[-1]
 
-    text_props = dict(horizontalalignment="left",
-                      verticalalignment="top",
-                      transform=ax.transAxes)
-    plt.text(left, upper,
-             '\n'.join((
-                 r"Global average temperature difference *",
-                 r"1850-{}".format(last_year))),
-             fontdict=fontxl,
-             linespacing=1.2,
-             **text_props)
-    plt.text(left, upper - .125,
-             '\n'.join((
-                 r"(*) Compared to {} pre-industrial levels".format(period),
-                 r"Data source - HadCRUT5")),
-             fontdict=fontxs,
-             linespacing=1.5,
-             **text_props)
+    text_props = dict(
+        horizontalalignment="left", verticalalignment="top", transform=ax.transAxes
+    )
+    plt.text(
+        left,
+        upper,
+        "\n".join(
+            (r"Global average temperature difference *", r"1850-{}".format(last_year))
+        ),
+        fontdict=fontxl,
+        linespacing=1.2,
+        **text_props,
+    )
+    plt.text(
+        left,
+        upper - 0.125,
+        "\n".join(
+            (
+                r"(*) Compared to {} pre-industrial levels".format(period),
+                r"Data source - HadCRUT5",
+            )
+        ),
+        fontdict=fontxs,
+        linespacing=1.5,
+        **text_props,
+    )
 
     fig = plt.gcf()
-    fig.set_size_inches(10, 8)   # 1 inch equal to 80pt
+    fig.set_size_inches(10, 8)  # 1 inch equal to 80pt
 
     if outfile:
-        fig.savefig(outfile, dpi=80, bbox_inches='tight')
+        fig.savefig(outfile, dpi=80, bbox_inches="tight")
         plt.close(fig)
     else:
         plt.show()
 
+
 # pylint: disable=C0116
 def main():
     args = parse_args()
 
-    plotbar(args.period,
-            args.outfile,
-            args.verbose)
+    plotbar(args.period, args.outfile, args.verbose)
+
 
 main()