python3 implement business card management system

#! /usr/bin/python3

import cards_tools

# Wireless looping, with the user deciding when to exit the system
while True:

 # Display function menu
 cards_tools.show_menu()

 action_str = input("Please select the operation you wish to perform:")

 print("\n\n\n\n\n\n The operation you have selected is [%s] " % action_str)

 # 1,2,3 Operations for business cards
 if action_str in ["1", "2", "3"]:

 # 1. Handling of additional business cards
 if action_str == "1":
  cards_tools.new_card()
 # 2. Show all business cards
 elif action_str == "2":
  cards_tools.show_all()
 # 3. Search for business cards
 elif action_str == "3":
  cards_tools.search_card()

 # 0 Exit system
 elif action_str == "0":

 print("Welcome to using [Business Card Management System] again")

 break
 # If you don't want to write branching code immediately, a pass placeholder ensures that the program code is structured correctly.
 # pass
 # Other content entered incorrectly, need to prompt the user
 else:
 print("You have entered incorrectly, please make a new selection.")

# Record all business card dictionaries
card_list = []


def show_menu():

 """Show menu"""
 print("*" * 50)
 print("Welcome to Business Card Management System V 1.0")
 print("")
 print("1. Add a business card")
 print("2. Show all business cards")
 print("3. Querying/modifying/deleting business cards")
 print("")
 print("0. Exit the system.")
 print("*" * 50)


def new_card():

 """Add a business card"""
 print("-" * 50)
 print("Add a business card")

 # 1. prompts the user to enter business card details
 name_str = input("Please enter your name:")
 phone_str = input("Please enter the phone number:")
 qq_str = input("Please enter QQ:")
 email_str = input("Please enter mailbox:")

 # 2. Create a business card dictionary using user-entered information
 card_dict = {"name" : name_str,
   "phone" : phone_str,
   "qq" : qq_str,
   "email" : email_str}

 # 3. Add the business card dictionary to the list
 card_list.append(card_dict)

 print(card_dict)

 # 4. Prompting the user to add success
 print("\n\\n\n\n\n Add %s of business cards successfully." % name_str)


def show_all():

 """Show all business cards"""
 print("-" * 50)
 print("Show all business cards")

 # Determine if a business card record exists, if not, prompt the user and return to the
 if len(card_list) == 0:

 print("There are currently no business cards recorded, please add a business card")

 # return returns the result of the execution of a function
 # The code underneath will not be executed
 # If return is not followed by anything, it means it will return to the location where the function was called
 # And return no results
 return

 # Print form header
 for name in ["Name", "Telephone.", "QQ", "Mailbox."]:
 print(name, end="\t\t")

 print("")
 # Print the dividing line
 print("=" * 50)

 # Iterate through the list of business cards one at a time and output the dictionary information.
 for card_dict in card_list:
 print("%s\t\t%s\t\t%s\t\t%s" % (card_dict["name"],
     card_dict["phone"],
     card_dict["qq"],
     card_dict["email"]))


def search_card():

 """Search for business cards"""
 print("-" * 50)
 print("Search for business cards")

 # 1. prompts the user to enter the name to be searched for
 find_name = input("Please enter the name to be searched:")

 # 2. traverse the list of business cards, query the name to be searched, and prompt the user if it is not found
 for card_dict in card_list:

 if card_dict["name"] == find_name:

  print("name and surname\t\ttelephones\t\tQQ\t\tinbox")
  print("=" * 50)
  print("%s\t\t%s\t\t%s\t\t%s" % (card_dict["name"],
      card_dict["phone"],
      card_dict["qq"],
      card_dict["email"]))

  # Modify or delete a found business card.

  deel_card(card_dict)

  break

 else:

 print("Sorry, no %s found." % find_name)


def deel_card(find_dict):
 """Handling found business cards

 :param find_dict: searched business card
 """
 print(find_dict)

 action_str = input("Please select the action to be performed."
   "1 Modify 2 Delete 0 Return to previous level")

 if action_str == "1":

 find_dict["name"] = input_card_info(find_dict["name"], "name and surname(carriage return without modification (computing))：")
 find_dict["phone"] = input_card_info(find_dict["phone"], "telephones(carriage return without modification (computing))：")
 find_dict["qq"] = input_card_info(find_dict["qq"], "QQ(carriage return without modification (computing))：")
 find_dict["email"] = input_card_info(find_dict["email"], "mails(carriage return without modification (computing))：")

 print("Modification of business card successful!")

 elif action_str == "2":

 card_list.remove(find_dict)

 print("Business card deleted successfully!")

 elif action_str == "0":
 show_menu()


def input_card_info(dict_value, tip_message):
 """Enter business card information

 :param dict_value:original value in dictionary
 :param tip_message:input tip text
 :return:Returns the content if the user has entered it, otherwise returns the original value.
 """
 # 1. Prompt for modified information
 result_str = input(tip_message)

 # 2. return the input, if any
 if len(result_str) > 0:
 return result_str

 # 3. If there is no input, return the original value
 else:
 return dict_value