实现一个简单的单词本

功能：

可以添加单词和词义，当所添加的单词已存在有相应提示

可以查找单词，当查找的单词不存在时有相应提示

可以删除单词，当删除的单词不存在时有相应提示

以上功能可以无限制操作，直到用户输入bye退出程序

dict = {}

while 1:

command = input("Please input your command: ")

if command == "add":

new_word = input("Please input the word want to add: ")

if new_word in dict:

print("The word already exist.")

continue

meaning = input("Please input the corresponding meaning to the word: ")

dict[new_word] = meaning

print("Thanks! The following new word has been added: %s" % new_word)

print("Continue input your command.")

elif command == "search":

keyword = input("Please input the word want to search: ")

if keyword in dict:

print("Found it!")

else:

print("Not found.")

print("Continue input your command.")

elif command == "delete":

word_for_delete = input("Please input the word want to delete: ")

if word_for_delete not in dict:

print("Not found. Not able to delete.")

else:

dict.pop(word_for_delete)

print("%s is deleted successfully." % word_for_delete)

print("Continue input your command.")

elif command == "bye":

print("Exit the program.")

break

else:

print("Wrong command. Please input again.")

continue