28
'True and True' #Ture
'False and True' #False
'1 == 1 and 2 == 1' #False
'"test" == "test"' #True
'1 == 1 or 2 != 1' #True
'True and 1 == 1' #True
'False and 0 != 0' #False
'"test" == "testing"' #False
'1 != 0 and 2 == 1' #False
'"test" != "testing"' #True
'"test" == 1' #False
'not(True and False)' #True
'not(1 == 1 and 0!=1)' #False
'not(10 ==1 or 1000 == 1000)' #False
'not(1!=10 or 3==4)' #False
'not("testing" == "testing" and "Zed" == "Cool Guy")' #True
'1==1 and not("testing" == 1 or 1 == 0)' #True
'"chunky" == "banon" and not (3 == 4 or 3==3)' #False
'3 == 3 and not ("testing" == "testing" or "Python" == "Fun")' #False
29
people = 20
cats = 30
dogs = 15
if people < cats:
print("Too many cats! The world is doomed!")
if people > cats:
print("Not many cats, the world is saved!")
if people < dogs:
print("The world is drooled on!")
if people > dogs:
print("The world is dry.")
dogs += 5
if people >= dogs:
print("People are greater than or equal to dogs.")
if people <= dogs:
print("People are less than or equal to dogs.")
if people == dogs:
print("People are dogs.")
30
people = 30
cars = 40
buses = 15
if cars > people:
print("We should take the cars.")
elif cars < people:
print("We should not take the cars.")
else:
print("We can't decide.")
if buses > cars:
print("That's too many buses.")
elif buses < cars:
print("Maybe we could take the buses.")
else:
print("We still can't decide.")
if people > buses:
print("Alright, let's just take the buses.")
else:
print("Fine, let's stay home then.")
31
print("You enter a dark room with two doors. Do you go through door #1 or door #2?")
door = raw_input("> ")
if door == "1":
print("There's a giant bear here eating a chesse cake. What do you do?")
print("1. Take the cake.")
print("2. Scream at the bear.")
bear = raw_input("> ")
if bear == "1":
print("The bear eats your face off. Good job!")
elif bear == "2":
print("The bear eats your legs off. Good job!")
else:
print("Well, doing %s is probably better. Bear runs away." % bear)
elif door == "2":
print("You stare into the endless abyss at Cthulhu's retina.")
print("1. Blueberries.")
print("2. Yellow jacket clothespins.")
print("3. Understanding revolvers yelling melodies.")
insanity = raw_input("> ")
if insanity == "1" or insanity == "2":
print("Your body survives powered by a mind of jello. Good job!")
else:
print("The insanity rots your eyes into a pool of muck. Good job!")
else:
print("You stumble around and fall on a knife and die. Good job!")
32
the_count = [1,2,3,4,5]
fruits = ['apples', 'oranges', 'pears', 'apricots']
change = [1, 'pennies', 2, 'dimes', 3, 'quarters']
#this first kind of for-loop goes through a list
for number in the_count:
print("This is count %d " % number)
#same as above
for fruit in fruits:
print("A fruit of type: %s" % fruit)
# also we can go through mixed lists too
# notice we have to use %r since we don't know what's in it
for i in change:
print("I got %r" %i)
# we can also build lists, first start with an empty one
elements = []
# then use the range function to do 0 to 5 counts
# range(1,6)生成从1到6步数为1的序列，第一个参数可以省略，从0开始，可以加入第三个参数为步数
for i in range(1,6):
print("Adding %d to the list." % i)
#append is a function that lists understand
elements.append(i) #list末尾添加新的对象
# elements.sort() 排序
# elements.reverse() 反向列表中元素
# elements.clear() 清空列表
# elements.copy() 复制列表
# elements.count(x) 统计某个元素出现的次数
# elements.extend(seq) 在列表末尾一次性增加另一个列中的多个值
# elements.index() 从列表中查找某个值的第一个匹配项的索引位置
# elements.insert() 将对象插入列表中
# elements.remove() 移除列表中某个值的第一个匹配项
# elements.pop() 移除列表中的一个值（初始最后一个），并返回值
# len(list) 列表元素个数
# max(list) 列表中的最大值
# min(list) 列表中的最小值
# list(seq) 将元组转换为list
# now we can print them out too
for i in elements:
print("Elements was: %d " % i)
i = 0
numbers = []
while i < 6:
print("At the top i is %d" % i)
numbers.append(i)
i = i + 1
print("Numbers now:", numbers)
print("At the bottom i is %d" % i)
print("The numbers:")
for num in numbers:
print(num)
#for range
i = 0
numbers = []
for i in range(6):
print("At the top i is %d" % i)
numbers.append(i)
i = i + 1
print("Numbers now:", numbers)
print("At the bottom i is %d" % i)
print("The numbers:")
for num in numbers:
print(num)
#函数
def list_num(x):
i = 0
numbers = []
for i in range(x):
print("At the top i is %d" % i)
numbers.append(i)
i = i + 1
print("Numbers now:", numbers)
print("At the bottom i is %d" % i)
print("The numbers:")
for num in numbers:
print(num)
list_num(10)
34
animals = ['bear', 'python', 'peacock', 'kangaroo', 'whale', 'platypus']
print("The animal at 1 is the 2nd animal and is a %s" % animals[1])
print("The 3rd animal is at 4 and is a %s" % animals[4])
print("The 1st animal is at 2 and is a %s" % animals[2])
print("The animal at 3 is the 4th animal and is a %s" % animals[3])
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