feat(projects): 新增Scrapy综合案例示例代码

projects/crawling/single_inheritance.py

@@ -0,0 +1,42 @@
+class Father:  # 1
+    genre = "sports"  # 2
+
+    def __init__(self, name):  # 4
+        self.name = name
+
+    def exercise(self):  # 4
+        print('exercise better!')
+
+
+class Child(Father):  # 5
+    def __init__(self, name, gender):  # 6
+        self.name = name  # 7
+        self.gender = gender  # 8
+
+    def exercise(self):  # 9
+        if self.genre == "sports":
+            print("exercise good!")
+        else:
+            print("exercise")
+
+    def hobbies(self):  # 10
+        return ["reading", "watching movies", "music"]
+
+
+def main():
+    elder_ming = Father("Ming")
+    elder_ming.exercise()
+    elder_ming_has_hobbies = hasattr(elder_ming, "hobbies") or False
+    print(f"Elder Ming has other hobbies? {elder_ming_has_hobbies}")
+    print("=" * 20)
+
+    young_ming = Child("Ming", "boy")
+    young_ming.exercise()
+    young_ming_has_hobbies = hasattr(young_ming, "hobbies")
+    print(f"Young Ming has other hobbies? {young_ming_has_hobbies}")
+    if young_ming_has_hobbies:
+        print(f"Young Ming's hobbies: {young_ming.hobbies()}")
+
+
+if __name__ == '__main__':
+    main()