#範例7-6：字典dict的複製
#https://www.w3schools.com/python/python_dictionaries_copy.asp
#https://www.w3school.com.cn/python/python_dictionaries.asp

#注意1：不可以直接設定dict2 = dict1, You cannot copy a dict simply by typing dict2 = dict1, 
#您不能通過鍵入 dict2 = dict1 來複製字典，因為：dict2 只是對 dict1 的引用，而 dict1 中的更改也將自動在 dict2 中進行。
#原因：because: dict2 will only be a reference to dict1, and changes made in dict1 will automatically also be made in dict2.
#結果：改了dict2, 也會更動到dict1
#解決方法：There are ways to make a copy, one way is to use the built-in dict method copy().

#語法：dict2 = dict1.copy()
#語法：dict2 = dict(dict1)

#-----------------------------
#phone = {"品牌":"samsung","規格":"galaxy s22","銷售年":2022}
#1.錯誤的複製方法：p2 = phone
#p2 = phone
#p2["品牌"] = "iphone"
#print(phone.values())
#print(p2.values())
#-----------------------------
#建立phone的dict

#複製到p2

#修改p2的品牌名稱

print("phone的所有值=")
print("p2的所有值=")

#結論：複製dict，不可以直接 a2 = a1
#因為，兩個會連動，修改一個，就會改到另外一個

#----------------------------
#2.正確的複製方法(1) phone.copy()
#phone = {"品牌":"samsung","規格":"galaxy s22","銷售年":2022}
#p2 = phone.copy()
#p2["品牌"] = "iphone"
#print(phone.values())
#print(p2.values())
#----------------------------
print()
#建立phone的dict
phone = {"品牌":"samsung","規格":"galaxy s22","銷售年":2022}
#複製到p2

#修改p2的品牌名稱

print("phone的所有值=")
print("p2的所有值=")

#-----------------------------
#3.正確的複製方法(2) dict(phone)
#p2 = dict(phone)
#p2["品牌"] = "iphone"
#print(phone.values())
#print(p2.values())
#--------------------------------------------------
print()
#建立phone的dict
phone = {"品牌":"samsung","規格":"galaxy s22","銷售年":2022}
#複製到p2

#修改p2的品牌名稱

print("phone的所有值=")
print("p2的所有值=")






























































































#-----------------------------------------------------------

#範例7-6：字典dict的複製
#https://www.w3schools.com/python/python_dictionaries_copy.asp
#https://www.w3school.com.cn/python/python_dictionaries.asp

#注意1：不可以直接設定dict2 = dict1, You cannot copy a dict simply by typing dict2 = dict1, 
#原因：because: dict2 will only be a reference to dict1, and changes made in dict1 will automatically also be made in dict2.
#結果：改了dict2, 也會更動到dict1
#解決方法：There are ways to make a copy, one way is to use the built-in dict method copy().

#語法：dict2 = dict1.copy()
#語法：dict2 = dict(dict1)

#-----------------------------
#1.錯誤的複製方法: p2 = phone
phone = {"品牌":"samsung","規格":"galaxy s22","銷售年":2022}
p2 = phone
p2["品牌"] = "iphone"
print(phone.values())
print(p2.values())

#結論：複製dict，不可以直接 a2 = a1
#因為，兩個會連動，修改一個，就會改到另外一個

#----------------------------
#2.正確的複製方法(1) phone.copy()
phone = {"品牌":"samsung","規格":"galaxy s22","銷售年":2022}
p2 = phone.copy()
p2["品牌"] = "iphone"
print()
print(phone.values())
print(p2.values())


#-----------------------------
#3.正確的複製方法(2) dict(phone)
phone = {"品牌":"samsung","規格":"galaxy s22","銷售年":2022}
p2 = dict(phone)
p2["品牌"] = "iphone"
print()
print(phone.values())
print(p2.values())



#-----------------------------------------------------------