ch05: new chapter

05-record-like/dataclass/coordinates.py

@@ -0,0 +1,24 @@
+"""
+``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
+    long: float
+        
+    def __str__(self):
+        ns = 'N' if self.lat >= 0 else 'S'
+        we = 'E' if self.long >= 0 else 'W'
+        return f'{abs(self.lat):.1f}°{ns}, {abs(self.long):.1f}°{we}'
+# end::COORDINATE[]