Develop Reference

TypeError: get_first_name() missing 1 required positional argument: 'self' in Python

So im having trouble displaying the admins first name, for some reason it keeps saying it doesnt exist, please give me some feedback on whats wrong, very appreciated
below you can find the admin class where we set all parameters like first name and last name etc
after that weve got the bank system class where ive imported the admin class and instanced it and still nothing, even after adding the missing positional argument it says that fname does not exist
class Admin:
def __init__(self, fname, lname, address, user_name, password, full_rights):
self.fname = fname
self.lname = lname
self.address = address
self.user_name = user_name
self.password = password
self.full_admin_rights = full_rights
def update_first_name(self, fname):
self.fname = fname
def update_last_name(self, lname):
self.lname = lname
def get_first_name(self):
return self.fname
def get_last_name(self):
return self.lname
from customer_account import CustomerAccount
from admin import Admin
accounts_list = []
admins_list = []
class BankSystem(object):
def __init__(self):
self.accounts_list = []
self.admins_list = []
self.load_bank_data()
def load_bank_data(self):
# create admins
admin_1 = Admin("Julian", "Padget", ["12", "London Road", "Birmingham", "B95 7TT"], "id1188", "1441", True)
self.admins_list.append(admin_1)
admin_2 = Admin("Cathy", "Newman", ["47", "Mars Street", "Newcastle", "NE12 6TZ"], "id3313", "2442", False)
self.admins_list.append(admin_2)
def search_admins_by_name(self, admin_username):
found_admin =None
for a in self.admins_list:
username =a.get_username()
if username ==admin_username:
found_admin =a
break
if found_admin ==None:
print("\n The Admin %s does not exist! Try again...\n"%admin_username)
return found_admin
def main_menu(self):
#print the options you have
print()
print()
print ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
print ("Welcome to the Python Bank System")
print ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
print ("1) Admin login")
print ("2) Quit Python Bank System")
print (" ")
option = int(input ("Choose your option: "))
return option
def run_main_options(self):
loop = 1
while loop == 1:
choice = self.main_menu()
if choice == 1:
username = input ("\n Please input admin username: ")
password = input ("\n Please input admin password: ")
admin_obj = self.admin_login(username, password)
if admin_obj != None:
self.run_admin_options(admin_obj)
elif choice == 2:
loop = 0
print ("\n Thank-You for stopping by the bank!")
def admin_login(self, username, password):
found_admin=self.search_admins_by_name(username)
msg="\n Login failed"
if found_admin!=None:
if found_admin.get_password()==password:
print("Login Sucssesful")
return msg,found_admin
def admin_menu(self, admin_obj):
#print the options you have
admin_obj = Admin
print (" ")
print ("Welcome Admin %s %s : Avilable options are:" %(admin_obj.get_first_name(), admin_obj.get_last_name()))
print ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
print ("1) Transfer money")
print ("2) Customer account operations & profile settings")
print ("3) Delete customer")
print ("4) Print all customers detail")
print ("5) Sign out")
print (" ")
option = int(input ("Choose your option: "))
return option
app = BankSystem()
app.run_main_options()

At least two problems:
BankSystem.admin_login() returns a pair consisting of a message and an admin object, but run_main_options() assigns that pair to a single variable admin_obj. You should change it to something like msg, admin_obj = … to behave like you appear to expect.
BankSystem.admin_menu() overwrites the object it was passed on the first line. This line should be removed.

Adding a error message in Python as well as commands

#!/usr/bin/env python3
import csv
# a file in the current directory
FILENAME = "contacts.csv"
def write_contacts(contacts):
with open(FILENAME, "w", newline="") as file:
writer = csv.writer(file)
writer.writerows(contacts)
def read_contacts():
contacts = []
with open(FILENAME, newline="") as file:
reader = csv.reader(file)
for row in reader:
contacts.append(row)
return contacts
def list_contacts(contacts):
for i in range (len(contacts)):
contact= contacts[i]
print(str(i+1) +"."+ contact[0])
print()
def view_contact(contacts):
pos = int(input("Number: "))
if not (pos-1)in range(len(contacts)):
print(str(pos) + ' not in list, try again')
view(contacts)
return
contact = []
print(name + email + phone+".\n")
print()
def delete_contact(contacts):
index = int(input("Number: "))
contact = contacts.pop(index -1)
write_contacts(contacts)
print(contact[0]+" was deleted.\n")
def add_contact(contacts):
name=input("Name: ")
email=input("Email: ")
phone=input("Phone number: ")
contact= []
contact.append(name)
contact.append(email)
contacts.append(contact)
write_contacts(contacts)
print(name + " was added.\n")
def display_menu():
print("Contact Manager")
print()
print("COMMAND MENU")
print("list - List all contacts")
print("view - View a contact")
print("add - Add a contact")
print("delete- Delete a contact")
print()
print()
def main():
display_menu()
contacts = read_contacts()
while True:
command = input("Command: ")
if command.lower() == "list":
list_contacts(contacts)
elif command.lower()== "view":
view_contact(contacts)
elif command.lower()== "add":
add_contact(contacts)
elif command.lower()== "delete":
delete_contact(contacts)
break
else:
print("Not a valid command. Please try again.\n")
print("Bye!")
if __name__ == "__main__":
main()
This all my code. I'm trying to figure out how to make the delete and view commands display an error message when the user enters a number that is invalid but it's not working. I'm also trying to view a contact when the user selects a specific number form list which would then display the email name and phone number of that selected number. I'm currently stuck
The errors im getting are
raceback (most recent call last):
, line 93, in
main()
, line 81, in main
view_contact(contacts)
, line 32, in view_contact
view(contacts)
NameError: name 'view' is not defined

I don't think you has a good start with list into cvs using append, anyway is your example.
You can use remove to remove your contact from list, see examples with list: http://www.thegeekstuff.com/2013/06/python-list
when the user select a specific number from list , just read by stepping to the number phone because you add with: name + email + phone.
adding an error message , use: try except finally

Running a dictionary with a while loop

I am trying to insert a while loop into this program so when it asks for member it starts a dictionary (assuming I would use a dictionary) that lets me input n number of band members and the instrument they use in some form like (name,instrument),(name2,instrument2)..and so on. I know it will be run as a while loop, but I'm not not sure how to enter it in this instance. Would using a dictionary be the best action and if so how would I add it in a case like this?
class Song:
def __init__(self, song, chart, member):
self.song = song
self.chart = chart
self.member = member
def __str__(self):
return (self.song
+ " Top Chart:"
+ str(self.chart)
+ " Band Members: "
+ str(self.member)
+ '\n')
def write():
with open("string.txt", "a+", encoding="utf-8") as f:
while(1):
prompt = ":\t"
in_song = input("Input song or type q " + prompt)
if (in_song == 'q'):
break
in_chart_spot = input("Input chart spot" + prompt)
in_band_mem = input("Input band members" + prompt)
song_data = Song(in_song, in_chart_spot, in_band_mem)
#albumdata = Album()
f.write(str(song_data))
if __name__ == '__main__':
write()

Problems with pickling data

import random
import pickle, shelve
import os
#import RPi.GPIO as GPIO | Raspberry pi only
import tkinter
import sys
import time
class Operator(object):
global list_name
def __init__(self):
print("Welcome to Python OS 1.0")
print("type 'help' to access help...") # ADD CODE OS.REMOVE("FILE")
def CheckDetails(self):
if not os.path.isfile( 'details.dat' ) :
data=[0]
data[0] = input('Enter Your Name: ' )
file= open( 'details.dat' , 'wb' )
pickle.dump( data , file )
file.close()
else :
File = open( 'details.dat' , 'rb' )
data = pickle.load( File )
file.close()
user = ""
while user != data[0]:
input("please enter your username...")
print( 'Welcome Back To Python OS, '+ data[0])
def Help(self):
print("""
write(sentence) - Prints the typed sentence on the screen
open(file, mode) - Opens the file and mode such as 'r'
create(listName) - creates the list, listName
add(data, listName) - adds the data to listName
remove(data, listName) - removes the selected data from listName
""")
def write(self, sentence):
print(sentence)
#classmethod
def create(self):
list_name = input("Please enter the list name...")
vars()[list_name] = []
time.sleep(1)
print("List (" + list_name + ") created")
def add(self):
data = input("Please specify the data to be added...")
list_name += data
def remove(self, data, list_name):
remove_data = input("Plese specify the data to be removed...")
list_name -= data
def main():
os = Operator()
os.CheckDetails()
ans = ""
ans = ans.lower()
while ans != "quit":
ans = input()
if ans == "write":
os.write()
elif ans == "help":
os.Help()
elif ans == "create":
os.create()
elif ans == "add":
os.add()
elif ans == "remove":
os.remove()
elif ans == "quit":
break
else:
print("Sorry, that command does not exist or it will be added into a future update...")
print("goodbye...")
main()
I am trying to make some sort of simplified python, but hitting errors only on the CheckDetails() function. I'm pickling data (which is fine) but getting errors when making the user check his or her username is correct, I've tested it and even though I have typed in the correct username, it carry's on asking for my username. Can anyone please help?

You have a while loop that will execute forever because you are not assigning your user variable to anything.
while user != data[0]:
user = input("please enter your username...")
print( 'Welcome Back To Python OS, '+ data[0])

Writing and retrieving pickled object to a file

I'm doing creating a address book for a computer science class, where we are supposed to have a list of objects "contact" written to a file when the program closes and read from the file when the program starts. However, after the data is written to the file, once it is read it does not seem to keep its object form.
import pickle
class Contact:
#Creating the class with the attributes I want
def __init__(self, firstname, lastname, number, areacode, city):
self.firstname = firstname
self.lastname = lastname
self.number = number
self.areacode = areacode
self.city = city
def __str__(self):
return "({0} {1}, {2}, {3}, {4})".format(self.firstname, self.lastname, self.number, self.areacode, self.city)
#reading the object
def opendata():
readable = []
addresses = []
A = open("Address_book", "rb+")
addresses = A.read()
A.close
B = len(addresses)
if B != 0:
readable = pickle.loads(addresses)
return readable
else:
return addresses
def savedata(file):
addresses = open("Address_book", "wb+")
temp = pickle.dumps(file)
addresses.write(temp)
addresses.close()
def Address_manager():
Address = []
fromfile = opendata()
Address.append(fromfile)
while True:
print("add = add contact, modify = modify contact, search = search contacts, end = close program, print = print full list")
A = input("What do you want to do?: ")
if A == "end":
savedata(Address)
break
else:
if A == "print":
for i in Address:
print(str(i))
print("")
continue
elif A == "add":
Address.append(add_contact())
print("")
continue
elif A == "search":
lists2 = search_contact(Address)
A = 0
for i in lists2:
A += 1
print(A, str(i))
print("")
print("")
continue
elif A == "modify":
modified = modify_contact(Address)
Address.append(modified)
print("")
continue
def add_contact():
while True:
try:
A = Contact(input("First name: "), input("Last name: "), input("Phone Number: "), input("Area Code: "), input("City: "))
print(str(A))
B = input("Is this right?: (y/n)")
if B == "y":
print("Well done?")
return A
else:
print("Try Again")
continue
except:
print("bad data")
If I try to "print" the list after getting it from the file it prints them in the wrong form. What am I doing wrong and why?
Edit 1: I apologize for the less than efficient code.
Edit 2: Added function to add contact