2019-09-26 at school

Author: xue9981

Chapter10/favorite.json

@@ -0,0 +1 @@
+"12"

Chapter10/favorite_number.py

@@ -0,0 +1,33 @@
+import json
+
+def get_favorite_number():
+    filename = "favorite.json"
+    try:
+        with open(filename) as f_obj:
+            number = json.load(f_obj)
+    except FileNotFoundError:
+        return None
+    else:
+        return number
+
+def get_new_number():
+    filename = "favorite.json"
+    # ask client's favorite number
+    number = input("Please input your favorite number: ")
+    
+    # save client's favoirte number
+    with open(filename, "w") as f_obj:
+        json.dump(number, f_obj)
+
+def get_user_number():
+    number = get_favorite_number()
+    if number:
+        output_number(number)
+    else:
+        get_new_number()
+
+def output_number(number):
+    # output client's favorite number
+    print("I know your favorite number! It's " + str(number))
+
+get_user_number()

Chapter10/remember_me.py

@@ -1,22 +1,47 @@
 import json
 
-def greet_user():
-    # if you saved data, load it.
-    # Or informe your user to add his/her name.
-    """greet user, and print his/her name"""
-    filename = 'username.json'
-    try: 
+def get_stored_username():
+    """if you saved username, print it"""
+    filename = "username.json"
+    try:
         with open(filename) as f_obj:
             username = json.load(f_obj)
     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 + "!")
+        return None
     else:
-        print("Welcome back, " + username + "!")
+        return username
+
+def get_new_username():
+    """inform user to input his/her name"""
+    username = input("What is your name? ")
+    filename = "username.json"
+    with open(filename, "w") as f_obj:
+        json.dump(username, f_obj)
+    return username
 
+def ask_user(username):
+    if username == None:
+        return None
+    while True:
+        msg = "Are you " + username + "? (yes/no) "
+        answer = input(msg)
+        if answer == "yes":
+            return username
+        elif answer == "no":
+            return None
+               
+def greet_user():
+    # if you saved data, load it.
+    # Or informe your user to add his/her name.
+    """greet user, and print his/her name"""
+    username = get_stored_username()
+    username = ask_user(username)
+    if username:
+        print("Welcome back, " + username + "!")
+    else:
+        username = get_new_username()
+        print("We'll remember you when you come back, " + username + "!")
+    
 greet_user()
 
 

Chapter10/username.json

@@ -1 +1 @@
-"Trump"
+"shunhou"