Develop Reference

How do I copy an employee information from one dictionary to another?

I am using the Python class Employee to copy create employees in an employee management system and pickle to a file. I got that to work fine, but my instructor wants to be able to search the system even for deleted employees. My question is how do I copy an object from employeDictionary to deletedemployeeDictionary? I keep running into errors.
Here is my employee class:
class Employee:
# Initialize Employee object
def __init__(self, name, ID, department, job):
self.__ID = ID
self.__name = name
self.__department = department
self.__job = job
# Set each object
def set_name(self, name):
self.__name = name
def set_ID(self, ID):
self.__ID = ID
def set_dept(self, department):
self.__department = department
def set_job(self, job):
self.__job = job
# Get each object
def get_name(self):
return self.name
def get_ID(self):
return self.__ID
def get_department(self):
return self.__department
def get_job(self):
return self.__job
def __str__(self):
return (f"ID Number: {self.__ID}\nName: {self.__name}\n"
f"Department: {self.__department}\n Job Title: {self.__job}")
Here is my main code:
import pickle
import emp2
def main():
# Try to open the existing dictionary file
try:
inputFile1 = open('employee.pickle', 'rb')
employeeDictionary = pickle.load(inputFile1)
inputFile1.close()
inputFile2 = open('deletedEmployee.pickle', 'rb')
deletedEmployeeDictionary = pickle.load(inputFile2)
inputFile2.close()
except:
employeeDictionary = {}
deletedEmployeeDictionary = {}
# While loop to continue until user chooses to quit
proceed = True
while proceed:
# Display user's option menu and ask for a choice
print('\n Employee Management System\n')
print('\t1. Lookup an employee')
print('\t2. Add a new employee')
print('\t3. Change an existing employee')
print('\t4. Delete an existing employee')
print('\t5. Save and Quit\n')
choice = int(input('Enter an option to continue: '))
if choice == 1:
lookup (employeeDictionary, deletedEmployeeDictionary)
elif choice ==2:
add(employeeDictionary)
elif choice == 3:
change (employeeDictionary)
elif choice == 4:
delete (employeeDictionary, deletedEmployeeDictionary)
elif choice == 5:
save_quit(employeeDictionary, deletedEmployeeDictionary)
proceed = False
else:
print ('Invalid input!')
choice = int(input('Enter an option to continue: '))
# Lookup an employee
def lookup(dictionary, dictionary2):
# Look up the ID number if it is in the dictionary
employee_id = int(input('Enter the employee ID number: '))
if employee_id in dictionary:
# print('employee_id', ': ', dictionary[employee_id])
print(dictionary.get(employee_id))
elif employee_id in dictionary2:
# print('employee_id', ': ', dictionary2[employee_id])
print(dictionary2.get(employee_id))
else:
print("That ID number was not found.")
# Add an employee
def add(dictionary):
# Add a new employee
empyloyee_id = int(input('Enter the employee ID number: '))
if empyloyee_id not in dictionary.keys():
name = input('Enter the name of the employee: ')
dept = input('Enter the employee department: ')
job = input('Enter the employee job title: ')
entry = emp2.Employee(name, empyloyee_id, dept, job)
dictionary[empyloyee_id] = entry
print('Employee added succesfully')
else:
print('Employee already exists!')
# Change an employee
def change(dictionary):
# If user-entered ID is in dictionary, allow them to change the info
employee_id = int(input(
'Enter the employee ID you would like to change: '))
if employee_id in dictionary.keys():
name = input('Enter new employee name: ')
dept = input('Enter new employee department: ')
job = input('Enter new employee job title: ')
entry = emp2.Employee(name, employee_id, dept, job)
dictionary[employee_id] = entry
print('Employee changed successfully.')
else:
print('That employee ID was not found.')
# Delete an employee
def delete(dictionary, dictionary2):
# If user-entered ID is in dictionary, delete the entry
employee_id = int(input(
'Enter the employee ID you would like to remove: '))
if employee_id in dictionary.keys():
entry = emp2.Employee(dictionary[employee_id])
dictionary2[empyloyee_id] = entry
del dictionary[employee_id]
print('Employee successfully moved to deleted directory!')
else:
print('That employee ID was not found.')
# Save the dictionary and quit the program
def save_quit(dictionary, dictionary2):
# Pickle the dictionary and save to a file
outputFile1 = open('employee.pickle', 'wb')
pickle.dump(dictionary, outputFile1)
outputFile1.close
# Pickle the dictionary and save to a file
outputFile2 = open('deletedEmployee.pickle', 'wb')
pickle.dump(dictionary2, outputFile2)
outputFile2.close
def move(dictionary, dictionary2, employee_id):
empyloyee_id = dictionary.get(employee_id)
name = dictionary.get(name)
dept = dictionary.get(department)
job = dictionary.get(job)
entry = emp2.Employee(name, empyloyee_id, dept, job)
dictionary2[empyloyee_id] = entry
#Calls main function.
if __name__== '__main__':
main()

You have several pieces that require update.
In your lookup function, you do not inform the user whether or not the employee is in the active list or deleted list. You might want to let them know.
I moved your MOVE function to above the delete function. since your DELETE function requires a move call, having MOVE above DELETE gives the ability to handle the function once.
In your DELETE, we updated the script to allow for MOVE to happen, then we can use the POP function to remove the object from the roster.
import pickle
import employee as emp2
def main():
# Try to open the existing dictionary file
try:
inputFile1 = open('employee.pickle', 'rb')
employeeDictionary = pickle.load(inputFile1)
inputFile1.close()
inputFile2 = open('deletedEmployee.pickle', 'rb')
deletedEmployeeDictionary = pickle.load(inputFile2)
inputFile2.close()
except:
employeeDictionary = {}
deletedEmployeeDictionary = {}
# While loop to continue until user chooses to quit
proceed = True
while proceed:
# Display user's option menu and ask for a choice
print('\n Employee Management System\n')
print('\t1. Lookup an employee')
print('\t2. Add a new employee')
print('\t3. Change an existing employee')
print('\t4. Delete an existing employee')
print('\t5. Save and Quit\n')
choice = int(input('Enter an option to continue: '))
if choice == 1:
lookup(employeeDictionary, deletedEmployeeDictionary)
elif choice == 2:
add(employeeDictionary)
elif choice == 3:
change(employeeDictionary)
elif choice == 4:
delete(employeeDictionary, deletedEmployeeDictionary)
elif choice == 5:
save_quit(employeeDictionary, deletedEmployeeDictionary)
proceed = False
else:
print('Invalid input!')
choice = int(input('Enter an option to continue: '))
# Lookup an employee
def lookup(dictionary, dictionary2):
# Look up the ID number if it is in the dictionary
employee_id = int(input('Enter the employee ID number: '))
if employee_id in dictionary:
# print('employee_id', ': ', dictionary[employee_id])
print('Active Record...')
print(dictionary.get(employee_id))
elif employee_id in dictionary2:
# print('employee_id', ': ', dictionary2[employee_id])
print("Deleted Record...")
print(dictionary2.get(employee_id))
else:
print("That ID number was not found.")
# Add an employee
def add(dictionary):
# Add a new employee
empyloyee_id = int(input('Enter the employee ID number: '))
if empyloyee_id not in dictionary.keys():
name = input('Enter the name of the employee: ')
dept = input('Enter the employee department: ')
job = input('Enter the employee job title: ')
entry = emp2.Employee(name, empyloyee_id, dept, job)
dictionary[empyloyee_id] = entry
print('Employee added succesfully')
else:
print('Employee already exists!')
# Change an employee
def change(dictionary):
# If user-entered ID is in dictionary, allow them to change the info
employee_id = int(input(
'Enter the employee ID you would like to change: '))
if employee_id in dictionary.keys():
name = input('Enter new employee name: ')
dept = input('Enter new employee department: ')
job = input('Enter new employee job title: ')
entry = emp2.Employee(name, employee_id, dept, job)
dictionary[employee_id] = entry
print('Employee changed successfully.')
else:
print('That employee ID was not found.')
def move(dictionary, dictionary2, employee_id):
dictionary2[employee_id] = dictionary.get(employee_id)
# Delete an employee
def delete(dictionary, dictionary2):
# If user-entered ID is in dictionary, delete the entry
employee_id = int(input(
'Enter the employee ID you would like to remove: '))
if employee_Id in dictionary:
move(dictionary, dictionary2, employee_id)
dictionary.pop(employee_id)
print('Employee successfully moved to deleted directory!')
else:
print('Employee not in directory!')
# Save the dictionary and quit the program
def save_quit(dictionary, dictionary2):
# Pickle the dictionary and save to a file
outputFile1 = open('employee.pickle', 'wb')
pickle.dump(dictionary, outputFile1)
outputFile1.close
# Pickle the dictionary and save to a file
outputFile2 = open('deletedEmployee.pickle', 'wb')
pickle.dump(dictionary2, outputFile2)
outputFile2.close
# Calls main function.
if __name__ == '__main__':
main()

ValueError: not enough values to unpack (expected 3, got 2) & TypeError: must be str, not MemberClass

Below is my code for a class I am currently working. The title contains the errors I am receiving. Could someone please assist with my code? (The comment's explain the area of concern. Main Menu functions 5 & 6.)
PART 1 - CLASS ESTABLISHMENT
class MemberClass:
name = ""
phone = 0
number = 0
# Initiator Method
def __init__(self, name, phone, number):
self.name = name
self.phone = phone
self.number = number
# Mutator Method 1
def set_name(self, name):
self.name = name
# Mutator Method 2
def set_phone(self, phone):
self.phone = phone
# Mutator Method 3
def set_number(self, number):
self.number = number
# Accessor Method 1
def get_name(self):
return self.name
# Accessor Method 2
def get_phone(self):
return self.phone
# Accessor Method 3
def get_number(self):
return self.number
# Display Method
def display_data(self):
print("")
print("Current Team Member's Information")
print("------------------------------------------------")
print("Member's Name: ", self.name)
print("Member's Phone Number: ", self.phone)
print("Member's Jersey Number: ", self.number)
print("------------------------------------------------")
PART 2 - PROGRAM FUNCTIONS AND DATA
# Create a function for the main menu
def print_menu():
print("===========Main Menu===========")
print("1. Display Current Team Roster.")
print("2. Add Member.")
print("3. Remove Member.")
print("4. Edit Member.")
print("5. Save Progress.")
print("6. Load Current Team Roster")
print("9. Exit Program.\n")
return int(input("Please Enter Your Selection: "))
# Create a function for main menu option 1
def print_members(team_members):
if len(team_members) == 0:
print("No Current Team Members In Memory! Please Add All Team Members.")
else:
for x in team_members.keys():
team_members[x].display_data()
# Create a function for main menu option 2
def add_members(team_members):
new_name = input("Enter New Team Member's Name: ")
new_phone = int(input("Enter New Team Member's Phone Number: "))
new_number = int(input("Enter New Team Member's Jersey Number: "))
team_members[new_name] = MemberClass(new_name, new_phone, new_number)
return team_members
# Create a function for main menu option 3
def remove_members(team_members):
remove_name = input("Enter Existing Team Member's Name to Remove: ")
if remove_name in team_members:
del team_members[remove_name]
print("The Team Member ("+remove_name+") Is No Longer In Our Roster.")
else:
print("The Provided Name ("+remove_name+") Is Not Currently In Our Roster. Please Try Again.")
return team_members
# Create a function for main menu option 4
def edit_members(team_members):
original_name = input("Enter Existing Team Member's Name To Edit: ")
if original_name in team_members:
adjusted_name = input("Enter Existing Team Member's Updated Name: ")
adjusted_phone = int(input("Enter Existing Team Member's Updated Phone Number: "))
adjusted_number = int(input("Enter Existing Team Member's Updated Jersey Number: "))
del team_members[original_name]
team_members[original_name] = MemberClass(adjusted_name, adjusted_phone, adjusted_number)
else:
print("The Provided Name ("+original_name+") Is Not Currently In Our Roster. Please Try Again.")
return team_members
# Create a function for main menu option 5 ***PROBLEM AREA***
def save_members(members, filename):
out_file = open(filename, "wt")
with open(filename, "wt") as out_file:
for name, phone, number in members.items():
out_file.write(name + "," + phone + "," + number + "\n")
# Create a function for main menu option 6 ***PROBLEM AREA***
def load_members(members, filename):
in_file = open(filename, "rt")
with open(filename, "rt") as in_file:
while True:
in_line = in_file.readline()
if not in_line:
break
in_line = in_line[:-1]
name, phone, number = in_line.split(",")
members[name] = phone
PART 3 - PROGRAM ROOT CODE
# Team manager welcome screen, date & time
print("Welcome to San Angelo's Softball Team Roster")
print("This program keeps the most up-to-date information")
print("Today's Date: April 23, 2018")
print("Current Time: 0900\n")
# Create a dictionary named "team_members"
team_members = {}
# Provides Menu Screen
menu_selection = print_menu()
# Create while loop repeating the main menu.
while menu_selection != 9:
if menu_selection == 1:
print_members(team_members)
elif menu_selection == 2:
team_members = add_members(team_members)
elif menu_selection == 3:
team_members = remove_members(team_members)
elif menu_selection == 4:
team_members = edit_members(team_members)
elif menu_selection == 5:
filename = input("Enter Desired Filename: ")
save_members(team_members, filename)
elif menu_selection == 6:
filename = input("Enter Existing Filename: ")
load_members(team_members, filename)
menu_selection = print_menu()
print("Thank You For Updating San Angelo's Softball Team Roster!")

When you iterate a dictionary via dict.items, you may only iterate key / value pairs. Therefore, this line will fail as you are attempting to unpack 3 items when only 2 exist (key & value):
for name, phone, number in members.items():
Instead, what you should do:
for name, myclass in members.items():
phone = myclass.phone
number = myclass.number

How to add items to a class based on user input

I'm in the process of learning python and I am attempting to create a class for a football team. I am just working with different aspects of python to try and get a better understanding. I want a menu based system which will allow the user of the programme to either view all current team members or else register to join the team. Each team member will have a unique ID and when a person joins, it will simple give them the next available number. For example, Chris has the unique ID of 1, Carl has 2, so if Joe joins, he will be automatically given number three. Below is the code I currently have. Viewing card players works perfectly for me but I am struggling with adding a new player.
So my question is, how do I add a new member to the empty list I have which will store all my data and how do I implement that the next person who joins the team will be given the next available number? This is to ensure each member number is unique. Thanks in advance, eager to learn!
class Team(object):
members = [] #create an empty list to store data
def __init__(self, user_id, first, last, address):
self.user_id = user_id
self.first = first
self.last = last
self.address = address
self.email = first + '.' + last + '#python.com'
#instance is fully initialized so I am adding it to the list of users
Team.members.append(self)
def __str__(self):
print()
return 'Membership ID: {}\nFirst Name: {}\nSurname: {}\nLocation: {}\nEmail: {}\n'.format(self.user_id, self.first, self.last, self.address, self.email)
print()
#staticmethod
def all_members():
for user in Team.members:
print (user)
def add_member(Team):
print()
print("Welcome to the team!")
print()
first_name = input("What's your first name?\n")
second_name = input("What's your surname?\n")
address = input("Where do you live?\n")
for x in Team:
unique_id = unique_id =+ 1
user[user_id] = [user_id, first_name, second_name, address]
user_1 = Team(1, 'Chris', 'Parker', 'London')
user_2 = Team(2, 'Carl', 'Lane', 'Chelsea')
def menu(object):
continue_program = True
while continue_program:
print("1. View all members")
print("2. Add user")
print("3. Quit")
try:
choice = int(input("Please pick one of the above options "))
if choice == 1:
Team.all_members()
elif choice == 2:
Team.add_member(object)
elif choice == 3:
continue_program = False
print()
print("Come back soon! ")
print()
else:
print("Invalid choice, please enter a number between 1-3")
menu(object)
except ValueError:
print()
print("Please try again, enter a number between 1 - 3")
print()
#my main program
menu(object)

Things changes:
main function operation changed
user count field made static and automatically created with addition of new user
temp list created to hold users
please comment if you don't understand
all_users = []
class Team(object):
members = [] # create an empty list to store data
user_id = 0
def __init__(self, first, last, address):
self.user_id = Team.user_id
self.first = first
self.last = last
self.address = address
self.email = first + '.' + last + '#python.com'
Team.user_id += 1
# instance is fully initialized so I am adding it to the list of users
Team.members.append(self)
def __str__(self):
print()
return 'Membership ID: {}\nFirst Name: {}\nSurname: {}\nLocation: {}\nEmail: {}\n'.format(self.user_id,
self.first, self.last,
self.address,
self.email)
print()
#staticmethod
def all_members():
for user in all_users:
print(user)
#staticmethod
def add_member():
print()
print("Welcome to the team!")
print()
first_name = input("What's your first name?\n")
second_name = input("What's your surname?\n")
address = input("Where do you live?\n")
# for x in Team:
# unique_id = unique_id = + 1
all_users.append(Team(first_name, second_name, address))
def main():
user_1 = Team('Chris', 'Parker', 'London')
user_2 = Team('Carl', 'Lane', 'Chelsea')
all_users.extend([user_1, user_2])
continue_program = True
while continue_program:
print("1. View all members")
print("2. Add user")
print("3. Quit")
try:
choice = int(input("Please pick one of the above options "))
if choice == 1:
Team.all_members()
elif choice == 2:
Team.add_member()
elif choice == 3:
continue_program = False
print()
print("Come back soon! ")
print()
else:
print("Invalid choice, please enter a number between 1-3")
main()
except ValueError:
print()
print("Please try again, enter a number between 1 - 3")
print()
if __name__ == "__main__":
main()

You are so close:
#staticmethod
def add_member(): # belongs to the class
print()
print("Welcome to the team!")
print()
first_name = input("What's your first name?\n")
second_name = input("What's your surname?\n")
address = input("Where do you live?\n")
# get the maximum id and add one
if Team.members:
unique_id = max(Team.members, key=lambda m: m.user_id) + 1
else:
unique_id = 0
Team(unique_id , first_name, second_name, address)
And in the main function change on call:
elif choice == 2:
Team.add_member()

Attribute Error when importing dictionary from module to another

So I have 4 different classes which I need to combine into one class at the end in a program called "Main" . However whenever I run the Main program, it keeps throwing up an attribute error when it comes to accessing the emp_det dictionary from the Employee class into the other classes so I can use the generated Employee ID stored in the dictionary. (There are two more classes called Weekly_Paid and Timecard but I've only mentioned 3 for the sake of the brevity and because the error seems to be universal).
(All 3 classes are in different files.)
The error I keep getting:
Traceback (most recent call last):
File "C:/Users/Saloni/Documents/Case Sudy 3/MAIN.py", line 28, in <module>
s.MaintainTimecard()
File "C:/Users/Saloni/Documents/Case Sudy 3\Monthly_Paid.py", line 24, in MaintainTimecard
if emp_id in Employee.emp_det:
AttributeError: module 'Employee' has no attribute 'emp_det'
Employee Class:
# ATTRIBUTES: emp_nm, emp_ph, emp_add,emp_id, emp_dob
from random import *
class Employee:
emp_det={} #dictioary to save the details of the employees
#emp_id:[emp_nm,emp_ph,emp_add,emp_dob]
def add_emp(self):
lst=[] #to store all inputed details
print("Enter Employee Details:")
emp_nm=input("Name: ")
emp_ph=input("Contact Number: ")
emp_add=input("Address: ")
emp_dob=input("Date of Birth:")
lst.extend([emp_nm,emp_ph,emp_add,emp_dob]) #store the details
emp_id="emp"+str(randrange(1000,10000))
while emp_id in Employee.emp_det: # avoid repetition
emp_id="emp"+str(randrange(1000,10000))
Employee.emp_det[emp_id]=lst # make dictionary key and store in list
print("Your Employee ID is",emp_id)
def del_emp(self):
t=0 # to count number of invalid inputs
while t<=3:
emp_id=input("Employee ID:")
if emp_id in Employee.emp_det:
del Employee.emp_det[emp_id]
t=4 # to get the program out of the loop
else:
print("Invalid ID. Try Again.")
t+=1
def edit_emp(self):
t=0 # counting invalid inputs
while t<=3:
emp_id=input("Employee ID:")
if emp_id in Employee.emp_det: # checking validity
print("\n Edit: \n 1.Contact \n 2.Address \n")
ch=int(input("Option:"))
if ch==1:
Employee.emp_det[emp_id][1]=input("New Contact Number:")
elif ch==2:
Employee.emp_det[emp_id][2]=input("New Address:")
else:
print("Invalid Option")
t=4 #t o get the program out of the loop
else:
print("Invalid ID. Try Again.")
t+=1
def Edisplay(self):
print("The Employees are:")
print(" ID \t Name \t Contact \t Address \t Date of Birth")
for i in Employee.emp_det: # access to each dictionary element
print(i,"\t",end=" ")
for j in Employee.emp_det[i]: # access every value under the key
print(j,"\t",end=" ")
print("\n")
Monthly-Paid Class
import Employee
import Timecard
class Monthly_Paid:
fixSalary = 40000
def AcceptTimeCard (self):
print ("Timecard details are:")
for i in Timecard.emp_tcinfo:
print(i, "\t", end ="")
for j in Timecard.emp_tcinfo[i]:
print(j,"\t",end=" ")
def Gen_Paycheck (self):
emp_id = input("please enter employee ID")
if emp_id in Employee.emp_det:
print ("Total Salary of " + emp_id + " is :" + fixSalary)
def MaintainTimecard (self):
emp_id = input("Please enter your employee ID")
if emp_id in Employee.emp_det:
print("\n 1.Edit Start Time Hour "
"\n 2.Edit Start Time Minute "
"\n 3. Edit End Time Hour "
"\n 4.Edit End Time Minute")
ch = int(input("Input option"))
if ch == 1:
Timecard.emp_tcinfo[emp_id][1] = input(
"Input new Start Time Hour")
if ch ==2:
Timecard.emp_tcinfo[emp_id][2] = input(
"Input new Start Time Minute")
if ch == 3:
Timecard.emp_tcinfo[emp_id][3] = input(
"Input new End Time Hour")
if ch == 4:
Timecard.emp_tcinfo[emp_id][4] = input(
"Input new End Time Minute")
else:
print("Invalid input")
Main script
print ("Welcome to Employee Time Card System")
import Employee
e= Employee.Employee()
e.add_emp()
print("What kind of employee are you?")
print ("\n 1.Monthly Paid \n 2.Weekly Paid")
ch= int(input("Enter Choice"))
if ch ==1:
import Monthly_Paid
import Timecard
s = Monthly_Paid.Monthly_Paid()
w = Timecard.Timecard()
print("Monthly Paid")
t1= "y"
while t1=="y" or t1=="Y":
print ("\n 1.See Time Card \n2.Edit TimeCard \n 3.See Paycheck")
ch1 = int(input("Enter Choice"))
if ch1 == 1:
s.AcceptTimeCard
if ch1 == 2:
s.MaintainTimecard()
if ch1 == 3:
s.Gen_Paycheck()
else:
print("Invalid Choice")
t1 = input("Continue with Monthly Paid? Y/N")
elif ch == 2:
import Weekly_Paid
a= Weekly_Paid.Weekly_Paid()
t2= "y"
print ("Weekly Paid")
while t2=="y" or t2=="Y":
print ("\n 1.See Time Card \n2.Edit TimeCard \n 3.See Paycheck")
ch1 = int(input("Enter Choice"))
if ch1 == 1:
a.AcceptTimeCard()
if ch1 == 2:
a.MaintainTimeCard()
if ch1 == 3:
a.Gen_Paycheck()
else:
print("Invalid Choice")
t2 = input("Continue with Weekly Paid? Y/N")
else:
print("Invalid choice")

import Employee will look for a module Employee.py. If there is no file called Employee.py then you won't be able to make that import work.
So in the Monthly-Paid Class file you have to do something like:
from path.to.employee_file_name import Employee
The problem then arises from the fact that there's a module called Employee but that contains a class called Employee. Importing the module Employee doesn't give you access to the class automatically. To access the attribute of the
Employee class called emp_det you have to specify the class. So if you imported using
from Employee import Employee
To access you need:
Employee.emp_det
Alternatively if you imported with:
import Employee
then to access you need:
Employee.Employee.emp_det

Why are some variables not defined?

This is what I have to do:
Look up and print the student GPA
Add a new student to the class
Change the GPA of a student
Change the expected grade of a student
Print the data of all the students in a tabular format
Quit the program
import student
import pickle
lookup = 1
change = 2
add = 3
delete = 4
QUIT = 0
FILENAME = 'student.dat'
def main():
students_info = load_students()
choice = 0
load_students()
#add(students_info)
change_grade(students_info)
change_GPA(students_info)
#get_menu_choice()
look_up(students_info)
while choice != QUIT:
choice = get_menu_choice()
if choice == lookup:
look_up(students_info)
elif choice == add:
add(students_info)
elif choice == change:
change(students_info)
elif choice == delete:
delete(students_info)
save_students(students_info)
def load_students():
try:
input_file = open(FILENAME, 'rb')
students_dict = pickle.load(input_file)
input_file.close()
except IOError:
students_dict = {}
print(students_dict)
return students_dict
def get_menu_choice():
print()
print('Menu')
print("-------------------")
print('1. Look up ID')
print('2.....')
choice = int(input("Enter your choice:"))
return choice
def look_up(students_info):
ID = input('Enter ID:')
print(student_info.get(ID, "Not found!"))
## try:
## print(students_info[ID])
## except KeyError:
## print("Not found!")
def change_GPA(students_info):
ID = input("ID:")
if ID in students_info:
GPA= float(input("New GPA:"))
students=student.Student(ID,GPA,grade,work)
students_info[ID] = students
print ("This",students_info[ID])
else:
print("Not found!")
def change_grade(students_info):
ID = input("ID:")
if ID in students_info:
New_grade = input("Enter new grade:")
students=student.Student(ID,GPA,grade,work)
students_info[ID] = students
#new_grade = students_info[name]
else:
print("Not found!")
def add(students_info):
name = input("Enter the student name:")
ID= input("Enter student's ID:")
GPA= float(input("Enter GPA:"))
grade= input("Enter student's expected grade:")
work = input("Does the student work part time or full time?")
students=student.Student(name,ID,GPA,grade,work)
print(students_info['ID'])
def save_students(students_info):
output_file = open(FILENAME, 'wb')
pickle.dump(students_info, output_file)
output_file.close()
main()
Whenever I tried to change the GPA or grade it's not defined. How could I change one value from the dictionary studens_info?

As gus42 has commented, the errors you are getting are from the lines:
students=student.Student(ID,GPA,grade,work)
You've not defined grade or work in either of the places you do this (nor GPA in change_grade), so it should not be surprising that you're getting an error.
I think there are two ways to fix the issue:
The simplest way is to change your logic from creating a new Student object to modifying the one that already exists. I don't know exactly what the attribute names are in your Student class, but here's a reasonable guess at a solution:
def change_GPA(students_info):
ID = input("ID:")
if ID in students_info:
GPA= float(input("New GPA:"))
students_info[ID].GPA = GPA # assign new GPA to old student object
else:
print("Not found!")
def change_grade(students_info):
ID = input("ID:")
if ID in students_info:
grade = input("Enter new grade:")
students_info[ID].grade = grade # assign new grade to existing student object
else:
print("Not found!")
The other option is to replace the existing Student object with a new one with some different values. This is close to what your current code, but it only really makes sense if your Student objects are immutable (perhaps because you made the type with namedtuple?). To make it work (where your current code does not), you'll have to load the old values from the old Student object before making the new object:
def change_GPA(students_info):
ID = input("ID:")
if ID in students_info:
new_GPA = float(input("New GPA:"))
old_grade = students_info[ID].grade # load old values
old_work = students_info[ID].work
new_student = students.Student(ID, new_GPA, old_grade, old_work)
students_info[ID] = new_student # replace the old student with a new object
else:
print("Not found!")
def change_grade(students_info):
ID = input("ID:")
if ID in students_info:
new_grade = input("Enter new grade:")
old_GPA = students_info[ID].GPA
old_work = students_info[ID].work
new_student = students.Student(ID, old_GPA, new_grade, old_work)
students_info[ID] = new_student
else:
print("Not found!")