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05-data-classes/dataclass/coordinates.py

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+"""
+``Coordinate``: simple class decorated with ``dataclass`` and a custom ``__str__``::
+
+    >>> moscow = Coordinate(55.756, 37.617)
+    >>> print(moscow)
+    55.8°N, 37.6°E
+
+"""
+
+# tag::COORDINATE[]
+
+from dataclasses import dataclass
+
+@dataclass(frozen=True)
+class Coordinate:
+    lat: float
+    lon: float
+
+    def __str__(self):
+        ns = 'N' if self.lat >= 0 else 'S'
+        we = 'E' if self.lon >= 0 else 'W'
+        return f'{abs(self.lat):.1f}°{ns}, {abs(self.lon):.1f}°{we}'
+# end::COORDINATE[]