HNG.py

from random import sample
from string import ascii_letters, digits
from sys import exit 
from pprint import pprint 

name, first_name, last_name, gmail, default_password, status, bio_data_container, container = "", "", "", "","", "", {}, {} 
user_input = "" # stores input from users

'''name stores the individual names of registered employee
status holds a yes or no response from user 
bio_data_container contains the data of each employee
container contains the data of all registered employees 
'''

random_strings = "".join(sample(ascii_letters + digits,5)) # a list of random 5-character words

print("Command-line HNG Employees Bio-data Register Application".upper().center(65, "*"))

print()

print("Kindly proceed to filling your bio-data.")

print()

def final_output():
	''' this prints the successfully saved bio-data of registered employees
	'''
	print("You're done saving the bio-data of HNG's employees.", "All saved data are printed below:", sep = "\n")
	
	print() 
	
	# Bio-data of all registered employees is printed
	pprint(container, width = 20)
	
# FUNCTION DEFINITION OF MAIN()
def main():
	''' this collects the bio-data of employees to be registered and saves it in a super container dictionary for each employee successfully registered
	'''
	global name, count, bio_data_container, container
	
	first_name = input("Enter your first name: ").title()
	
	while first_name.isalpha() == False or len(first_name) < 2:
		print()
		
		print("Invalid input!", "Name should contain only alphabets and it should have more than two characters.", sep = "\n")
		
		print()
		
		first_name = input("Enter your first name: ").title()
		
		print()
	
	last_name = input("Enter your last name: ").title()
	
	while last_name.isalpha() == False or len(last_name) < 2:
		print()
		
		print("Invalid input!", "Name should contain only alphabets and it should have more than two characters.", sep = "\n")
		
		print()
		
		last_name = input("Enter your last name: "). title()
		
		print()
		
	gmail = input("Enter your gmail address: ").lower()
	
	# checks for the validity of email addresses 
	while gmail.endswith("@gmail.com") == False or len(gmail) <= len("@gmail.com"):
		print()
		
		print("Invalid input!", "Enter a valid gmail address.", sep = "\n")
		
		print()
		
		gmail = input("Enter your gmail address: "). lower()
		
	default_password = first_name[:2] + last_name[-2:] + random_strings
	
	print()
	
	print(f"Your default password is {default_password}")
	
	print()
	
	print("Are you satisfied with the default password?".title())
	
	user_input = input("Enter y for 'yes' or n for 'no' please: ").lower()
	
	while user_input.isalpha() == False or user_input not in ("yes", "y", "no", "n"):
		print()
		
		print("Invalid input!", "Enter y for 'yes' or n for 'no' please.", sep = "\n")
		
		print()
		
		user_input = input("Enter 'y' or 'n' please: ").lower()
		
	if user_input == "no" or user_input == "n":
		
		print()
		
		default_password = input("Enter your preferred password: ")
		
		# checks for password strength
		while len(default_password) < 8 or default_password.isalpha() == True or default_password.isnumeric() == True or default_password[0].isupper() == False:
			print()
			
			print("Enter a more secure password please.","Hint: Password must start with a capital letter, it must not be less than 8 characters, it must contain numbers.",sep="\n")
			print()
			
			default_password = input("Enter your preferred password: ")
			
	else:
		pass
						
	print()
	
	name = first_name + " " + last_name 
	
	# populating sub-container
	bio_data_container["Full_Name"] = name
	bio_data_container["Email_address"] = gmail
	bio_data_container["Password"] = default_password
	
	# populating super-container
	# this prevents two registered employees having the same bio-data
	if bio_data_container not in container.values(): 
		container[name +"'s bio-data are:"] = bio_data_container
				
		print(f"{name}'s bio-data saved successfully!")
	
		print()
	else:
		print("Bio-data NOT saved since it exists!")
		
		print()
		
		next_option()
		
# FUNCTION INVOCATION OF MAIN() 		
main()

bio_data_container = {} # this emulates the clearing of the contents of the dictionary storing the previously saved employee bio-data since this dictionary is now in a super dictionary called container & also because the empty bio_data_containerwould be used for subsequent registration of employees

# FUNCTION DEFINITION FOR NEXT_OPTION()
def next_option():
	''' this permits the registration of different employees consecutively. 
	'''
	global status, bio_data_container, user_input 
	
	print("Do you want to add another employee's bio-data?".upper())
	
	print()
	
	user_input = input("Enter y for 'yes' or n for 'no' please: ").lower()
		
	while user_input.isalpha() == False or user_input not in ("yes", "y", "no", "n"):
		print()
			
		print("Invalid input!", "Enter y for 'yes' or n for 'no' please.", sep = "\n")
			
		print()
			
		user_input = input("Enter 'y' or 'n' please: ").lower()
			
	if user_input == "no" or user_input == "n":
		status = ("no", "n")
		
		''' this is here because the execution of line 139 doesn't allow line 183 to be executed which needs to be executed for lines 189-190 and 195 to be executed consecutively. 
		'''
		if user_input in ("no", "n"):
			print()
			
			final_output()
			exit()

	elif user_input in ("yes", "y"):
		print()
		main() # invokes main program body
		bio_data_container = {} # emulates clearing of sub-container contents
		next_option() # recursive call that keeps asking user if he wishes to register another employee or not
	return status 

# FUNCTION INVOCATION OF NEXT_OPTION()
status = next_option()

# this is executed when user indicates that no other employee is to registered 
if status == ("no", "n"):
	pass

print()

# FINAL_OUTPUT INVOCATION 	
final_output()