contacts_list=[]
contacts_number=0

def Add_contact():
    global contacts_number
    contact_name=str(input("What is your contact's name ? "))
    contact_number=int(input("What is your contact's number ? "))
    contact_mail=str(input("What is your contact's mail ? "))
    new_contact=Contact(contact_name,contact_number,contact_mail)
    contacts_list.append(new_contact)
    contacts_number+=1
class Contact:
    def __init__(self,name,number,mail):
        self.name=name
        self.number=number
        self.mail=mail
        self.position=contacts_number

while True:
    choice=None
    choice=int(input("1 : New contact, 2 Delete Contact, 3 : Display a contact, 4 Display all contacts, 9 Leave "))
    if choice==1:
        Add_contact()
    elif choice==2:
        ask=input("How do you want to find your contact (in order to delete him) ? 1 Name, 2 Number, 3 Mail ? ")
        a=0
        if ask=="1":
            infos=str(input("What is his name ?"))
            while a<contacts_number:
                if contacts_list[a].name==infos:
                    del contacts_list[a]
                    contacts_number-=1
                    break
                else:
                    a+=1
        elif ask=="2":
            infos=int(input("What is his number ?"))
            while a<contacts_number:
                if contacts_list[a].number==infos:
                    del contacts_list[a]
                    contacts_number-=1
                    break
                else:
                    a+=1
        elif ask=="3":
            infos=str(input("What is his mail ?"))
            while a<contacts_number:
                if contacts_list[a].mail==infos:
                    del contacts_list[a]
                    contacts_number-=1
                    break
                else:
                    a+=1
    elif choice==3:
        zouk=input("How do you want to find your contact ? 1 Name, 2 Number, 3 Mail ? ")
        if zouk=="1":
            contact_searched_infos=str(input("What is his name ? "))
            for w in range(contacts_number):
                if contacts_list[w].name==contact_searched_infos:
                    print(f"Your contact's name is : {contacts_list[w].name}, his number is : {contacts_list[w].number}, his mail is : {contacts_list[w].mail}.")
        elif zouk=="2":
            contact_searched_infos=int(input("What is his number ? "))
            for w in range(contacts_number):
                if contacts_list[w].number==contact_searched_infos:
                    print(f"Your contact's name is : {contacts_list[w].name}, his number is : {contacts_list[w].number}, his mail is : {contacts_list[w].mail}.")
        elif zouk=="3":
            contact_searched_infos=str(input("What is his mail ? "))
            for w in range(contacts_number):
                if contacts_list[w].mail==contact_searched_infos:
                    print(f"Your contact's name is : {contacts_list[w].name}, his number is : {contacts_list[w].number}, his mail is : {contacts_list[w].mail}.")
    elif choice==4:
        for z in range(contacts_number):
            print(f"Your contact's name is : {contacts_list[z].name}, his number is : {contacts_list[z].number}, his mail is : {contacts_list[z].mail}.")
    elif choice==9:
        break