Finished chapter 3

chenguohui · chenguohui · commit c5d24d14e7db · 2017-06-29T10:38:56.000+08:00
diff --git a/chap03/collatz.py b/chap03/collatz.py
@@ -0,0 +1,14 @@
+def collatz(number):
+    if number % 2 == 0:
+        number = number // 2
+    else:
+        number = 3 * number + 1
+    print(number)
+    return number
+
+try:
+    number = int(input("Input a positive integer: "))
+    while number != 1:
+        number = collatz(number)
+except ValueError:
+    print("You should input a positive integer.")
diff --git a/chap03/guessTheNumber.py b/chap03/guessTheNumber.py
@@ -0,0 +1,21 @@
+# This is a guess the number game.
+import random
+secretNumber = random.randint(1, 20)
+print('I am thinking of a number between 1 and 20.')
+
+# Ask the player to guess 6 times.
+for guessesTaken in range(1, 7):
+    print('Take a guess.')
+    guess = int(input())
+
+    if guess < secretNumber:
+        print('Your guess is too low.')
+    elif guess > secretNumber:
+        print('Your guess is too high.')
+    else:
+        break # This condition is the correct guess!
+
+if guess == secretNumber:
+    print('Good job! You guessed my number in ' + str(guessesTaken) + ' guesses!')
+else:
+    print('Nope. The number I was thinking of was ' + str(secretNumber))
diff --git a/chap03/helloFunc.py b/chap03/helloFunc.py
@@ -0,0 +1,8 @@
+def hello():
+    print('Howdy!')
+    print('Howdy!!!')
+    print('Hello there.')
+
+hello()
+hello()
+hello()
diff --git a/chap03/helloFunc2.py b/chap03/helloFunc2.py
@@ -0,0 +1,5 @@
+def hello(name):
+    print('Hello ' + name)
+
+hello('Alice')
+hello('Bob')
diff --git a/chap03/magic8Ball.py b/chap03/magic8Ball.py
@@ -0,0 +1,25 @@
+import random
+
+def getAnswer(answerNumber):
+    if answerNumber == 1:
+       return 'It is certain'
+    elif answerNumber == 2:
+        return 'It is decidely decidedly so'
+    elif answerNumber == 3:
+        return 'Yes'
+    elif answerNumber == 4:
+        return 'Reply hazy try again'
+    elif answerNumber == 5:
+        return 'Ask again later'
+    elif answerNumber == 6:
+        return 'Concentrate and ask again'
+    elif answerNumber == 7:
+        return 'My reply is no'
+    elif answerNumber == 8:
+        return 'Outlook not so good'
+    elif answerNumber == 9:
+        return 'Very doubtful'
+
+r = random.randint(1, 9)
+fortune = getAnswer(r)
+print(fortune)
diff --git a/chap03/sameName.py b/chap03/sameName.py
@@ -0,0 +1,13 @@
+def spam():
+    eggs = 'spam local'
+    print(eggs) # prints 'spam local'
+
+def bacon():
+    eggs = 'bacon local'
+    print(eggs) # prints 'bacon local'
+    spam()
+    print(eggs) # prints 'bacon local'
+
+eggs = 'global'
+bacon()
+print(eggs) # prints 'global'
diff --git a/chap03/sameName2.py b/chap03/sameName2.py
@@ -0,0 +1,7 @@
+def spam():
+    global eggs
+    eggs = 'spam'
+
+eggs = 'global'
+spam()
+print(eggs)
diff --git a/chap03/sameName3.py b/chap03/sameName3.py
@@ -0,0 +1,13 @@
+def spam():
+    global eggs # this is the global
+    eggs = 'spam'
+
+def bacon():
+    eggs = 'bacon' # this is a local
+
+def ham():
+    print(eggs) # this is the global
+
+eggs = 42 # this is the global
+spam()
+print(eggs)
diff --git a/chap03/sameName4.py b/chap03/sameName4.py
@@ -0,0 +1,6 @@
+def spam():
+    print(eggs) # ERROR!
+    eggs = 'spam local'
+
+eggs = 'global'
+spam()
diff --git a/chap03/zeroDivide.py b/chap03/zeroDivide.py
@@ -0,0 +1,10 @@
+def spam(divideBy):
+    return 42 / divideBy
+
+try:
+    print(spam(2))
+    print(spam(12))
+    print(spam(0))
+    print(spam(1))
+except ZeroDivisionError:
+    print('Error: Invalid argument.')
