#10-1 Python學習筆記
with open('learning_python.txt') as file_object:
    contents = file_object.read()
    print(contents)

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with open('learning_python.txt') as file_object:
    for line in file_object:
        print(line.rstrip())

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with open('learning_python.txt') as file_object:
    lines = file_object.readlines()

for line in lines:
    print(line.rstrip())

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#10-2 C語言學習筆記
with open('learning_python.txt') as file_object:
    lines = file_object.readlines()

for line in lines:
    line1 = line.replace('Python'
 
,'C')
    print(line1.rstrip())

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#10-3 訪客
filename = 'guest.txt'
with open(filename,'w') as file_object:
    name = input('請輸入你的名字：')
    file_object.write(name)

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#10-4 訪客名單
filename = 'guest_book.txt'
with open(filename,'a') as file_object:
    print('按‘q’推出')
    while True:
        name = input('請輸入你的名字：'
 
)
        if name == 'q':
            break
        file_object.write(name + '\n')

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#10-5 關於程式設計的調查
filename = 'reason.txt'
with open(filename,'a') as file_object:
    print('按‘q’推出')
    while True:
        reason = input('請問你為何喜歡程式設計：')
        if reason == 'q':
            break
        file_object.write(reason + '\n')

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#10-6 加法運算
try:
    number1 = int(input('請輸入一個數字：'))
    number2 = int(input('請在輸入一個數字：'))
    result = number1 + number2
    print(result)
except ValueError:
    print('你輸入的格式有問題')

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#10-7 加法計算器
while True:
    try:
        number1 = int(input('請輸入一個數字：'))
        number2 = int(input('請在輸入一個數字：'))
        result = number1 + number2
        print(result)
    except ValueError:
        print('你輸入的格式有問題')

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#10-8 貓和狗
try:
    with open('cats.txt') as cat:
        print(cat.read())
    with open('dogs.txt') as dog:
        print(dog.read())
except FileNotFoundError:
    print('對不起沒有找到檔案')

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#10-9 沉默的貓和狗
try:
    with open('cats.txt') as cat:
        print(cat.read())
    with open('dogs.txt') as dog:
        print(dog.read())
except FileNotFoundError:
    pass

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#10-10 常見單詞
try:
    with open("The Girl Scouts' Canoe Trip by Edith Lavell.txt") as book:
        content = book.read()
        number = content.lower().count('the')
        print(number)
except FileNotFoundError:
    pass

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#10-11 喜歡的數字
import json

filename = 'numbers.json'
number = input('請輸入你最喜歡的數字：')
with open(filename, 'w') as f_obj:
     json.dump(number, f_obj)
with open(filename) as f_obj:
     number = json.load(f_obj)
     print('I know your favorite number! It is ___' + number)

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#10-12 記住喜歡的數字
import json

filename = 'numbers.json'
try:    
    with open(filename) as f_obj:
        number = json.load(f_obj)
        print('I know your favorite number! It is ___' + number)
except FileNotFoundError:
    number = input('請輸入你最喜歡的數字：')
    with open(filename, 'w') as f_obj:
        json.dump(number, f_obj)

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#10-13 驗證使用者
import json

def get_stored_username():
    """如果儲存了使用者名稱，就獲取它"""
    filename = 'username.json'
    try:
        with open(filename) as f_obj:
            username = json.load(f_obj)
    except FileNotFoundError:
        return None
    else:
        return username

def get_new_username():
    """提示使用者輸入使用者名稱"""
    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():
    """問候使用者，並指出其名字"""
    username = get_stored_username()
    if username:
        yep = input('Is ' + username + ' your name?(y/n)')
        if  yep == 'y':
            print("Welcome back, " + username + "!")
        else:
            username = get_new_username()
            print("We'll remember you when you come back, " + username + "!")
    else:
        username = get_new_username()
        print("We'll remember you when you come back, " + username + "!")

greet_user()