### 每一行自己寫，每行都要了解，要了解程式的執行順序。 ###
### 寫不出來就偷看或找解答，但是要完全的 tracing code。 ###
### 解法不只一種，此處只提供參考解法，並非唯一解答，只要符合題目要求，都算答對。 ###



### Chatper 1

# 練習 1-2 (hw1-1-HelloWorld.py)
print('Hello, Python!')
print('整數 3 + 2 相加，結果為: ')
print(3 + 2)



### Chatper 2

# 練習 2-2
from time import sleep

sleep(1)
print('*')
sleep(1)
print('**')
sleep(1)
print('***')
sleep(1)
print('****')
sleep(1)
print('*****')



### Chatper 3

# 練習 3-4
name = input("What's your name? ")
age = int(input('How old are you? '))
older = age + 25
print('Hi ' + name + '! In 25 years you will be ' + str(older) + '!')



# 練習 3-5
b = int(input('Enter a number: '))
e = int(input('Enter a number: '))
b_e = b ** e
print('b to the power of e is', b_e)



### Chatper 4

# 練習 4-2-1
fah = 75
cel = (fah - 32) / 1.8
print(cel)



# 練習 4-2-2
miles = 5
km = miles / 0.62137
meters = 1000 * km
print("miles")
print(miles)
print("km")
print(km)
print("meters")



### Chapter 5

# 觀念驗證 5.1
1. 否
2. 是
3. 否
4. 否
5. 否



# 觀念驗證 5.2
1. num is less than 10
   Finished
2. Finished
3. Finished



# 觀念驗證 5.3

1. if " " in word:
2. if num1 + num2 < 0:



# 觀念驗證 5.4
略



# 觀念驗證 5.5
1. True
2. True
3. False
4. True
5. 226007



# 練習 5-1-2
var = 0

if type(var) == int:
    print("I'm a numbers person.")

if type(var) == str:
    print("I'm a words person.")



# 練習 5-1-3
words = input('Tell me anything: ')

if ' ' in words:
    print('This string has spaces.')



# 練習 5-1-4
print('Guess my number! ')
secret = 7
num = int(input("What's your guess? (0-99) "))

if num < secret:
    print('Too low.')

if num > secret:
    print('Too high.')

if num == secret:
    print('You got it!')



# 練習 5-1-5
num = int(input('Tell me a number: '))

if num >= 0:
    print('Absolute value: ', num)

if num < 0:
    print('Absolute value: ', -num)



# 觀念驗證 5.6
數字有 3 種狀況，使用 if-else 語法的話，只能判斷正數或負數，當使用者輸入 0 時，無法顯示正確的訊息。



# 觀念驗證 5.7
num 為 -3，輸出：num is negative
num 為 0，輸出：num is zero
num 為 2，輸出：num is positive
num 為 1，輸出：num is positive



# 觀念驗證 5.8
略



# 觀念驗證 5.9
num			if-elif-else		if
-------------------------------------------------------------------------------
20			num is greater than 3 	num is greater than 3
			Finished. 			Finished.
-------------------------------------------------------------------------------
9			num is less than 10	num is less than 10
			Finished. 			num is greater than 3
							Finished.
-------------------------------------------------------------------------------
5			num is less than 6	num is less than 6
			Finished. 			num is less than 10
							num is greater than 3
							Finished.
-------------------------------------------------------------------------------
0			num is less than 6	num is less than 6
			Finished.			num is less than 10
							Finished.



# 練習 5-2-1
num1 = int(input('One number: '))
num2 = int(input('Another number: '))

if num1 < num2:
    print('first number is less than the second number')
elif num2 < num1:
    print('first number is greater than the second number')
else:
    print('numbers are equal')



# 練習 5-2-2
words = input('Enter anything: ')

if 'a' in words and 'e' in words and 'i' in words and 'o' in words and 'u' in words:
    print('You have all the vowels!')

if words[0] == 'a' and words[-1] == 'z':
    print("And it's sort of alphabetical!")



### Chapter 6

# 觀念驗證 6.1
s = input('請輸入顯示內容: ')
n = int(input('請輸入顯示次數: '))

while(n > 0):
    print(n, s) 
    n = n - 1



# 觀念驗證 6.2
因為 tries 先加 1 才印出次數，因此顯示的猜測次數會比實際猜的次數多 1 次。



# 練習 6-1-1
# 此為猜數字，修正後的程式碼如下
num = 8
guess = int(input('Guess my number: '))

while guess != num:
    guess = int(input('Guess again: '))

print('Right!')



# 練習 6-1-2
play = input('Play? y or yes: ')

while play == 'y' or play == 'yes':
    num = 8
    guess = int(input('Guess a number! '))
    
    while guess != num:
        guess = int(input('Guess again: '))
        
    print('Right!')
    play = input('Play? y or yes: ')
    
print('See you later!')



# 觀念驗證 6.3
1. 0
2. 0, 1, 2, 3, 4
3. 0, 1, 2, 3, 4, 5, 6, ..., 99



# 觀念驗證 6.4
1. 0, 1, 2, 3, 4, 5, 6, 7, 8
2. 3, 4, 5, 6, 7
3. -2, 0, 2
4. 5, 2, -1, -4
5. (無資料)



# 觀念驗證 6.5
Mins = int(input('please input Minutes to countdown: '))
for i in range(Mins-1, -1, -1):
    for j in range(59, -1, -1):
        print(i, ':', j)



# 練習 6-2-1
counter = 0

for num in range(1, 100):
    if num % 3 == 0:
        counter += 1

print(counter, 'numbers are even and divisible by 3')



# 練習 6-2-2
layer = int(input('請問要幾層: '))

for i in range(layer):
    print(' ' * (layer -1 - i) + '*' * (i * 2 + 1))



# 觀念驗證 6.6
vowels = 'aeiou'
words = input('Tell me something: ')

for letter in words:
    if letter in vowels:

print('vowel')



# 觀念驗證 6.7
Name = (('張', '天才'), ('王', '子帥'), ('陳', '美美'))
print('全名是: ')

for e in Name:
    print(e[0] + e[1])



# 觀念驗證 6.8
password = 'robot fort flower graph'
space_count = 0

for ch in password:
    if ch == ' ':
        space_count += 1

print(space_count)

# 我們也可以使用 password.count(' ')，來計算字串內有幾個空白。



# 練習 6-3-1
names = input('Tell me some names, separated by spaces: ')
name = ''

for ch in names:
    if ch == ' ':
        print('Hi', name)
        name = ''
    else:
        name += ch
    
# 需額外處理最後一個名字，因為最後一個名字之後沒有空白
lastspace = names.rfind(' ')
print('Hi', names[lastspace + 1:])



# 練習 6-3-2
wish_list = ()
item = input('What do you want to buy? ')

while (item != '沒了'):
    wish_list = wish_list + (item, )
    item = input('What do you want to buy? ')

print('你購買的物品如下: ')

for e in wish_list:
  print('● ' + e)