migration from cloud service

week3/ex3.py

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+def main():
+    usingJSON = False
+    al = []
+    print('==Exercise 3==')
+    if not usingJSON: 
+        print('''I have a method to input all 5 floats in one time using JSON.
+            Pls set usingJSON = True in source code to try it.''')
+        for i in range(5):
+            flag=True
+            while flag:
+                a = input(f"pls input float {i+1}:")
+                try: 
+                    a = float(a)
+                    flag=False
+                    al.append(a)
+                except :
+                    print("pls input a float!")
+        print(al)
+    else:
+        import json
+        print("In this case you need to enter a JSON string of the whole list.")
+        flag=True
+        while flag:
+            a = input("pls input float[] JSON:")
+            try: 
+                a = json.loads(a)
+                states = [True if type(i)==float else False for i in a]
+                if False in states:
+                    print(f"Error! not a float[]!\nCurrent Input:{a}")
+                    raise ValueError("Not a float[]")
+                flag=False
+                al.append(a)
+            except :
+                print("pls input a proper float[]!")
+    print('==End Of Ex3==')
+    return 0
+
+if __name__ == '__main__':
+    main()