# How to create a Random password generator(with GUI) application using python? # Introduction While creating a new account on any platform it is important to set a strong password so that outsiders and hackers will not be able to guess your password. In this blog, we are going to see how to create a Random password generator using python # Code ## Headers ``` from tkinter import * from tkinter import messagebox import re import random ``` Tkinter is used for the GUI of the application re is used to check password strength random is used to generate random password ## Setting up a title ``` root=Tk() root.title("Random password generator") ``` ![Screenshot (219).png](https://cdn.hashnode.com/res/hashnode/image/upload/v1652106138523/BdEidV8gg.png align="left") root is the main window of the application ## Password fields ``` top=Frame(root) uc=Button(top,text="Upper Case",font=("Comic Sans MS", 15, "bold"),bg="green",command=lambda: change_mode("uc",uppercase)) lc=Button(top,text="Lower Case",font=("Comic Sans MS",15, "bold"),bg="red",command=lambda: change_mode("lc",lowercase)) num=Button(top,text="Numbers",font=("Comic Sans MS", 15, "bold"),bg="red",command=lambda: change_mode("num",number)) sym=Button(top,text="Symbols",font=("Comic Sans MS", 15, "bold"),bg="red",command=lambda: change_mode("sym",symbol)) uc.grid(row=0,column=0,padx=5) lc.grid(row=0,column=1,padx=5) num.grid(row=0,column=2,padx=5) sym.grid(row=0,column=3,padx=5) top.grid(row=0,column=0) ``` ![scr20.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1652106253161/COTW1OAhW.png align="left") top(Frame):- It is the upper part of the application uc (Button):- It will turn on/off the Uppercase field lc (Button):- It will turn on/off the Lowercase field num (Button):- It will turn on/off the Numbers field sym (Button):- It will turn on/off the Symbols field ## Getting password and displaying it ``` middle=Frame(root) password_length=Scale(middle, from_=0, to=30,length=350,width=20, orient=HORIZONTAL) password=Entry(middle,font=("Comic Sans MS", 20, "bold")) generate=Button(middle,text="Generate",font=("Comic Sans MS", 13, "bold"),bg="green",command=generate_password) password_length.grid(row=0,column=0,pady=20) password.grid(row=1,column=0,padx=10) generate.grid(row=1,column=1) middle.grid(row=1,column=0,pady=5) ``` ![scr21.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1652106546797/K2VMmhU-o.png align="left") middle(Frame):- It is the lower part of the application password_length(Scale) :- In which user can select password length password(Entry):- In which password is going to be displayed generate(Button):- It will invoke the generate_password function ## Functions ``` def generate_password(): global uppercase,lowercase,number,symbol global password global password_length lowercase_ch="abcdefghijklmnopqrstuvwxyz" uppercase_ch="ABCDEFGHIJKLMNOPQRSTUVWXYZ" numbers="01234567890" symbols="!@#$%^&*()?{}[]+^;.,<>" if (lowercase or uppercase or number or symbol)==0: messagebox.showinfo("Password generator", "Select atleast one field") password_sample="" if uppercase: password_sample+=uppercase_ch if lowercase: password_sample+=lowercase_ch if number: password_sample+=numbers if symbol: password_sample+=symbols p = "".join(random.sample(password_sample,int(password_length.get() ))) if(len(p)>=8): if(bool(re.match('((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%^&*]).{8,30})',p))==True): password.config(fg="green") elif(bool(re.match('((\d*)([a-z]*)([A-Z]*)([!@#$%^&*]*).{8,30})',p))==True): password.config(fg="red") else: password.config(fg="red") password.delete(0,END) password.insert(0,p) def change_mode(what,color): global uc,lc,num,sym global uppercase,lowercase,number,symbol if what=="uc": if color: uc.config(bg="red") uppercase=0 else: uc.config(bg="green") uppercase=1 if what=="lc": if color: lc.config(bg="red") lowercase=0 else: lc.config(bg="green") lowercase=1 if what=="num": if color: num.config(bg="red") number=0 else: num.config(bg="green") number=1 if what=="sym": if color: sym.config(bg="red") symbol=0 else: sym.config(bg="green") symbol=1 ``` generate_password(function) will check which are fields checked by the user and based on the input length given by the user it will generate a password. change_mode(function) will change the color of the button and set the field as 0/1 for example:- when lc(button) is clicked it will change green to red color and set lowercase(variable) to zero ## Final code ``` from tkinter import * from tkinter import messagebox import re import random root=Tk() root.title("Random password generator") #global variables uppercase=1 lowercase=0 number=0 symbol=0 #functions def generate_password(): global uppercase,lowercase,number,symbol global password global password_length lowercase_ch="abcdefghijklmnopqrstuvwxyz" uppercase_ch="ABCDEFGHIJKLMNOPQRSTUVWXYZ" numbers="01234567890" symbols="!@#$%^&*()?{}[]+^;.,<>" if (lowercase or uppercase or number or symbol)==0: messagebox.showinfo("Password generator", "Select atleast one field") password_sample="" if uppercase: password_sample+=uppercase_ch if lowercase: password_sample+=lowercase_ch if number: password_sample+=numbers if symbol: password_sample+=symbols p = "".join(random.sample(password_sample,int(password_length.get() ))) if(len(p)>=8): if(bool(re.match('((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%^&*]).{8,30})',p))==True): password.config(fg="green") elif(bool(re.match('((\d*)([a-z]*)([A-Z]*)([!@#$%^&*]*).{8,30})',p))==True): password.config(fg="red") else: password.config(fg="red") password.delete(0,END) password.insert(0,p) def change_mode(what,color): global uc,lc,num,sym global uppercase,lowercase,number,symbol if what=="uc": if color: uc.config(bg="red") uppercase=0 else: uc.config(bg="green") uppercase=1 if what=="lc": if color: lc.config(bg="red") lowercase=0 else: lc.config(bg="green") lowercase=1 if what=="num": if color: num.config(bg="red") number=0 else: num.config(bg="green") number=1 if what=="sym": if color: sym.config(bg="red") symbol=0 else: sym.config(bg="green") symbol=1 top=Frame(root) uc=Button(top,text="Upper Case",font=("Comic Sans MS", 15, "bold"),bg="green",command=lambda: change_mode("uc",uppercase)) lc=Button(top,text="Lower Case",font=("Comic Sans MS",15, "bold"),bg="red",command=lambda: change_mode("lc",lowercase)) num=Button(top,text="Numbers",font=("Comic Sans MS", 15, "bold"),bg="red",command=lambda: change_mode("num",number)) sym=Button(top,text="Symbols",font=("Comic Sans MS", 15, "bold"),bg="red",command=lambda: change_mode("sym",symbol)) uc.grid(row=0,column=0,padx=5) lc.grid(row=0,column=1,padx=5) num.grid(row=0,column=2,padx=5) sym.grid(row=0,column=3,padx=5) top.grid(row=0,column=0) middle=Frame(root) password_length=Scale(middle, from_=0, to=30,length=350,width=20, orient=HORIZONTAL) password=Entry(middle,font=("Comic Sans MS", 20, "bold")) generate=Button(middle,text="Generate",font=("Comic Sans MS", 13, "bold"),bg="green",command=generate_password) password_length.grid(row=0,column=0,pady=20) password.grid(row=1,column=0,padx=10) generate.grid(row=1,column=1) middle.grid(row=1,column=0,pady=5) root.mainloop() ``` ***Strong password*** ![Screenshot (223).png](https://cdn.hashnode.com/res/hashnode/image/upload/v1652107283399/rfMjo6exc.png align="left") ***Weak password*** ![Screenshot (224).png](https://cdn.hashnode.com/res/hashnode/image/upload/v1652107315374/TezBZlue4.png align="left") github code:-[click here](https://github.com/vasanthkumar7/random-password-generator)