remember_me.py

#~ import json

#~ username = input("What is your name? ")

#~ filename = 'username.json'
#~ with open(filename, 'w') as f_obj:
	#~ json.dump(username, f_obj)
	#~ print("We'll remember you when you come back, " + username + "!")

#########################

#~ import json 

#~ # Load the username, if it has been stored previously.
#~ # Otherwise, prompt for the username and store it.
#~ filename = 'username.json'
#~ try:
	#~ with open(filename) as f_obj:
		#~ username = json.load(f_obj)
		#~ print("Welcome back, " + username + "!")
#~ except FileNotFoundError:
	#~ username = input("What is your name? ")
	#~ with open(filename, 'w') as f_obj:
		#~ json.dump(username, f_obj)
		#~ print("We'll remember you when you come back, " + username + "!")
###########################################

#~ import json

#~ def greet_user():
	#~ """Greet the user by name."""
	#~ filename = 'username.json'
	#~ try:
		#~ with open(filename) as f_obj:
			#~ username = json.load(f_obj)
			#~ print("Welcome back, " + username + "!")
	#~ except FileNotFoundError:
		#~ username = input("What is your name? ")
		#~ with open(filename, 'w') as f_obj:
			#~ json.dump(username, f_obj)
			#~ print("We'll remember you when you come back, " + username + "!")
			
#~ greet_user()

################################
import json

def get_stored_username():
	"""Get stored username if available."""
	filename = 'username.json'
	try:
		with open(filename) as f_obj:
			username = json.load(f_obj)
		return username
	except FileNotFoundError:
		return None

def get_new_username():
	"""Prompt for a new username."""
	username = input("What is your name? ")
	filename = 'username.json'
	with open(filename, 'w') as f_obj:
		json.dump(username, f_obj)
	return username
			
def greet_user():
	"""Greet the user by name."""
	username = get_stored_username()
	if username:
		print("Welcome back, " + username + "!")
	else:
		username = get_new_username()
		print("We'll remember you when you come back, " + username + "!")
			
greet_user()