Pandey's code

from tkinter import *
import csv   #missing
from tkinter import messagebox
#configure tk window
t=Tk()
t.title("Banking")
t.geometry("500x500+500+100")

#set them to stringvar()
pas=StringVar()
un = StringVar()
lname = StringVar()
fname = StringVar()


#This where all function defines 
def f_write(path):
                            f1=open("database.csv","a")
                            f1.write(path)                            
                            f1.close()
def un_data(un,dv):
                                                        
                            f2=open(un+"1.csv","a")
                            f2.write(dv)
                            f2.close()
def f_read(bun,key=0):
    f22=open(bun+"1.csv","r")
    databas=f22.readlines()
    if key==1:
        return databas
    for row in databas:
        row=row.split(",")
        bcd=row[2]
    bcd=eval(bcd)
    f22.close()
    return bcd
def ssymbol(password):
                        b=['!', '"', '#', '$', '%', '&', "'", '(', ')', '*', '+', ',', '-', '.', '/', ':', ';', '<', '=', '>', '?', '@']
                        for i in password:
                            for j in b:
                                if i==j:
                                    return 1
def ucase(password):
                        
                        b=password.upper()
                        for i in password:
                            for j in b:
                                if i==j:
                                    return 1
def nnatural(password):
                        for i in range(49,58):
                            for j in password:
                                if chr(i)==j:
                                    return 1
                                
def password1(fname,lname,un,password,key):    #while causing loop that freeze button
    try:
        if (len(password))>8:
            fname = a
            lname = b
            un = c
            pas = d
            if a==b==c==d==1:
                print("password saved")
                
            elif key != 1:
                password=input("password not secure\nenter password again")
                sum=a+b+c
                path=(fname+","+lname+","+un+","+password+","+"\n")
                f_write(path)
            elif key==1:
                credit="0"
                debit="0"
                balance="1000"
                dv=credit+","+debit+","+balance+"\n"
                un_data(un,dv)
                print("Signup Succussfully")
            else:
                password=input("string should be more than 8 character\nenter password again")
    except:
        messagebox.warning("Wait","You did something wrong here,Try again")
                
def signup():

    #signup window
    sn=Tk()
    sn.title("Signup")
    sn.geometry("500x500+500+100")

    #label
    label=Label(sn,text="Enter your First name")
    label.place(x=50,y=50)
    text=Entry(sn,textvariable=fname)
    text.place(x=200,y=50)
    
    label1=Label(sn,text="Enter your last name")
    label1.place(x=50,y=100)
    text1=Entry(sn,textvariable=lname)
    text1.place(x=200,y=100)
    
    label2=Label(sn,text="Enter your Username")
    label2.place(x=50,y=150)
    text2=Entry(sn,textvariable=un)
    text2.place(x=200,y=150)
    
    label3=Label(sn,text="Enter your password")
    label3.place(x=50,y=200)
    text3=Entry(sn,textvariable=pas)
    text3.place(x=200,y=200)
     
    button=Button(sn,text='check password and save',command=saved) #password1(str(fname),str(lname),str(un),str(pas),key=1)
    button.place(x=50,y=300)

    sn.mainloop()
def saved():
##    fname.delete('0',END)
##    fname.update()
##    lname.delete('0',END)
##    lname.update()
##    pas.delete('0',END)
##    pas.update()
##    un.delete('0',END)
##    un.update()
    messagebox.showinfo("Done","You complete this process")
##    with open('person.csv', 'w') as csvFile:
##        writer = csv.writer(csvFile)
##        writer.writerows([text])
##        writer.writerows([text1])
##        writer.writerows([text2])
##        writer.writerows([text3])
    t.destroy()
def login():
    t.destroy() #destroy window
button=Button(text='Signup',command=signup).pack()
button=Button(text='login',command=login).pack()
t.mainloop()