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02-array-seq/match_lat_lon.py

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+"""
+metro_lat_long.py
+
+Demonstration of nested tuple unpacking::
+
+    >>> main()
+                    |  latitude | longitude
+    Mexico City     |   19.4333 |  -99.1333
+    New York-Newark |   40.8086 |  -74.0204
+    Sao Paulo       |  -23.5478 |  -46.6358
+
+"""
+
+# tag::MAIN[]
+metro_areas = [
+    ('Tokyo', 'JP', 36.933, (35.689722, 139.691667)),
+    ('Delhi NCR', 'IN', 21.935, (28.613889, 77.208889)),
+    ('Mexico City', 'MX', 20.142, (19.433333, -99.133333)),
+    ('New York-Newark', 'US', 20.104, (40.808611, -74.020386)),
+    ('Sao Paulo', 'BR', 19.649, (-23.547778, -46.635833)),
+]
+
+def main():
+    print(f'{"":15} | {"latitude":>9} | {"longitude":>9}')
+    for record in metro_areas:
+        match record:
+            case [name, _, _, (lat, lon)] if lon <= 0:
+                print(f'{name:15} | {lat:9.4f} | {lon:9.4f}')
+# end::MAIN[]
+
+if __name__ == '__main__':
+    main()