Python realizes business card management system

The examples in this article share the specific code of python to implement business card management system for your reference. The specific content is as follows

system requirement

Program starts, displays the welcome interface of the business card management system, and displays the function menu

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Welcome to use [Business Card Management System] V1.0
?

1. New business card
2. display all
3. Query business cards
   ?
4. Exit system

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• Users select different functions with numbers
• Perform different functions according to function selection
• The user's business card needs to record the user's [name] (https://www.zalou.cn/tag/xingming), phone number, QQ, email
• If the specified business card is found, the user can choose to modify or delete the business card
• Information saved locally

demand analysis

• The development is carried out in a separate file mode, the main file cards_main.py is complex business logic, and the cards_tool.py file is responsible for the realization of specific functions.
• Create new business card, show all, query the corresponding function [function] (https://www.zalou.cn/tag/hanshu) of the business card. If the code is too long, split it again.
• The choice of data structure? A business card contains multiple key-value pairs using a dictionary data type, and all business card information uses a list data structure.
• To ensure that the local storage and reading of business card information uses python file operations, enter the business card system to read the name information file first, and when exiting the business card system, all business card information is rewritten into the business card file.

Code

The code is very concise, and too many comments can be messy.

cards_main.py

import cards_tool
# Main business logic
cards_tool.read_card()
 
 
# 1. Display the main user interface
while True:
 cards_tool.show_menu()
 menu_str =input("Please choose an action:")print("The function you choose:%s"% menu_str)if menu_str =="1":
 cards_tool.create_card()
 elif menu_str =="2":
 cards_tool.show_card_all()
 elif menu_str =="3":
 cards_tool.search_card()
 elif menu_str =="0":
 cards_tool.write_card()breakelse:print("The input is wrong, please re-enter")

cards_tool.py

import os
card_info_all =[] #All business card information
# Specific functions of business card management
def write_card():"""When exiting the system, save the business card information to the folder"""
f =open("E:\workspace_python\FirstDemo\Business Card Management System.txt","w")
f.write(str(card_info_all))
f.close()
def read_card():"""When entering the system, load the business card information into the memory"""
is_exist = os.path.exists("E:\workspace_python\FirstDemo\Business Card Management System.txt")if is_exist:
# File exists, load information into memory
f =open("E:\workspace_python\FirstDemo\Business Card Management System.txt","r")
global card_info_all
card_info_all =eval(f.read())
# print(card_info_all)
f.close()else:
# No file creates empty file
f =open("E:\workspace_python\FirstDemo\Business Card Management System.txt","w")
f.close()print(is_exist)
def show_menu():"""Main menu page display"""print("*"*30)print("welcome[Naming Management System] v1.0")print()print("1.New business card")print("2.display all")print("3.Query business cards")print()print("0.Exit system")print("*"*30)
def create_card():"""New business card"""print("功能：New business card")
name =input("Please type in your name:")
phone =input("Please enter the phone:")
qq =input("Please enter qq number:")
email =input("please input your email:")
card_info ={"name":name,"phone":phone,"qq":qq,"email":email}
card_info_all.append(card_info)print("Add to%s'business card success"% name)
def show_card_all():"""Show all business cards"""print("Function: show all")if not len(card_info_all):print("No business card")returnprint("name".ljust(14),"phone".ljust(14),"qq".ljust(14),"email".ljust(14),sep="")print("-"*56)for card in card_info_all:print(card["name"].ljust(14),card["phone"].ljust(14),card["qq"].ljust(14),card["email"].ljust(14),sep="")print("-"*56)
def search_card():"""Query business cards"""print("功能：Query business cards")
name =input("Please enter the query name:")for card in card_info_all:if name == card["name"]:print("name".ljust(14),"phone".ljust(14),"qq".ljust(14),"email".ljust(14), sep="")print("-"*56)print(card["name"].ljust(14), card["phone"].ljust(14), card["qq"].ljust(14), card["email"].ljust(14),sep="")
# Advanced business card processing
set_card(card)break;else:print("could not find it%s"% name)
def set_card(card):"""Advanced settings for business cards"""while True:
menu =input("Please enter the operation on the business card: 1.modify/ 2.delete/ 0.Back to previous")if menu =="1":
name =input("Please type in your name:")
phone =input("Please enter the phone:")
qq =input("Please enter qq number:")
email =input("please input your email:")
card["name"]= name
card["phone"]= phone
card["qq"]= qq
card["email"]= email
print("%s's business card was modified successfully"% name)return
elif menu =="2":
card_info_all.remove(card)print("Successfully deleted business card")return
elif menu =="0":returnelse:print("The input is wrong, please re-enter")

Code running result

Exercise summary

This small exercise is mainly a comprehensive application of the basic knowledge of python. You must master the basic knowledge of python. Does it feel simple for friends who have experience in other programming languages?

For more learning materials, please pay attention to the topic "Management System Development".

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