1.2 python基本操作

1.数据类型

整数，浮点数，真值，字符串

python 对于数据类型可以不要特别申明，数据类型有python自动决定的。

a=10;
print(type(a))

2.输入、输出

• raw_input

• print 支持字符串通过“+”进行添加

name=raw_input("please enter your name")
print "hello!"+str(name)

3.（这个部分需要添加一些知识点）

序列：元组、列表 集合、字典

s1 = (2, 1.3, 'love', 5.6, 9, 12, False)  #元组
s2 = [True, 5, 'smile']                   #列表
d = {'name':'alexzhou','sex':'man'}       #字典
s = set('alexzhou')                       #集合

关于列表的一些使用：

list.append();list.extend();list.insert(i,x);

参考python官方文档

4.python 简单数学运算

• 数学 +, -, *, /, **, %
• 判断 ==, !=, >, >=, <, <=, in
• 逻辑 and, or, not

5.循环

# break  using
# if the cycle have "break",cycle will jump out! 
count = 0
for letter in 'Snow!':
    print 'Letter # ' + str(count) + ' is ' + str(letter)
    count += 1
    #break
print count

while 循环

x = 25
epsilon = 0.01
step = 0.1
guess = 0.0
while abs(guess**2-x) >= epsilon:
    if guess <= x:
        guess += step
    else:
        break
if abs(guess**2 - x) >= epsilon:
    print 'failed'
else:
    print 'succeeded: ' + str(guess)

6.函数

def iterPower(base, exp):
    result = base
    if exp == 0:
        return 1
    while exp >1:
        exp -= 1
        result = result * base      
    return result

6.1用迭代方式实现

def recurPower(base, exp):
    '''
    base: int or float.
    exp: int >= 0

    returns: int or float, base^exp
    '''
    if exp == 0:
        return 1
    elif exp == 1:
        return base
    return base * recurPower(base,exp-1)

6.2 类似回文

def semordnilap(str1, str2):
    '''
    str1: a string
    str2: a string

    returns: True if str1 and str2 are semordnilap;
             False otherwise.
    '''
    # Your code here
    if len(str1) != len(str2):
        return False
    elif len(str1) == 1 or len (str2) == 1:
        return False

    elif str1[0] != str2[-1]:
        return False
    elif str1[len(str1)-1] == str2[-len(str2)]:
        return True
    else:
        return semordnilap(str1[1:],str2[:-1])

7.面向对象（lecture12-4-1）

class A(object):
    def __init__(self):
        self.a = 1
    def x(self):
        print "A.x"
    def y(self):
        print "A.y"
    def z(self):
        print "A.z"
class B(A):
    def __init__(self):
        A.__init__(self)
        self.a = 2
        self.b = 3
    def y(self):
        print "B.y"
    def z(self):
        print "B.z"
class C(object):
    def __init__(self):
        self.a = 4
        self.c = 5
    def y(self):
        print "C.y"
    def z(self):
        print "C.z"
class D(C, B):
    def __init__(self):
        C.__init__(self)
        B.__init__(self)
        self.d = 6
    def z(self):
        print "D.z"