12

PyCharmMiscProject/students_package/student_q.py

@@ -0,0 +1,14 @@
+b = {1:'张三', 2:'老王', 3:'王五'}
+
+def select(sid):
+    # 判断sid这个id是否是字典的键
+    if sid in b:
+        return b[sid]   # 根据键取值
+    else:
+        return None
+
+if __name__ == '__main__':
+
+    print(select(1))
+    print(select(2))
+