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python进阶

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慕勒9208223

类里面的构造函数def __init__(self, ***)第一项参数固定为self，剩余的为其他自定义属性，创建实例时都要赋值，空值用None替代。访问时用‘.’操作符。
函数任意参数：*args表示元数据参数，无名，为tuple类；**kw表示关键字key-word参数，有key值，为dict类。*args在**kw前。

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0 采集收起来源：python中初始化实例属性
2018-10-31

双鱼座的泪

sorted()函数可对list进行排序：

>>>sorted([36, 5, 12, 9, 21])
[5, 9, 12, 21, 36]

倒序排列：

def reversed_cmp(x, y):
    if x > y:
        return -1
    if x < y:
        return 1
    return 0

>>> sorted([36, 5, 12, 9, 21], reversed_cmp)
[36, 21, 12, 9, 5]

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0 采集收起来源：python中自定义排序函数

2018-10-31

慕盖茨3033461

class Fib(object):

def __init__(self, num):
sum , L=0,[0,1]
for i in range(num-2):
sum = L[i]+L[i+1]
L.append(sum)
self.num = L
def __str__(self):
return str(self.num)
__repr__ = __str__

def __len__(self):
return len(self.num)

f = Fib(5)
print f
print len(f)

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0 采集收起来源：python中 __len__
2018-10-31
慕盖茨3033461

class Student(object):

def __init__(self, name, score):
self.name = name
self.score = score

def __str__(self):
return '(%s: %s)' % (self.name, self.score)

__repr__ = __str__

def __cmp__(x, y):
if x.score > y.score:
return -1
elif x.score < y.score:
return 1
elif x.name > y.name:
return 1
elif x.name < y.name:
return -1
else:
return 0

L = [Student('Tim', 99), Student('Bob', 88), Student('Alice', 99)]
print sorted(L)

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0 采集收起来源：python中 __cmp__
2018-10-31
慕盖茨3033461

class Person(object):

def __init__(self, name, gender):
self.name = name
self.gender = gender

class Student(Person):

def __init__(self, name, gender, score):
super(Student, self).__init__(name, gender)
self.score = score

def __str__(self):
return '(Student:%s,%s,%s)' % (self.name,self.gender,self.score)
__repr__ = __str__

s = Student('Bob', 'male', 88)
print s

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0 采集收起来源：python中 __str__和__repr__
2018-10-31
慕盖茨3033461

class Person(object):
def __init__(self, name, gender):
self.name = name
self.gender = gender

class Student(Person):
def __init__(self, name, gender, score):
super(Student, self).__init__(name, gender)
self.score = score
def whoAmI(self):
return 'I am a Student, my name is %s' % self.name
p = Person('hanyang','nv')
print p.name
s = Student('hanyang','nan' , 90)
print s.whoAmI()
print dir(s)
b = dir(s)
L = 'hanyang'
print len(L)
def ooo(x):
if len(x)<7:
return x

print filter(ooo,b)

print filter(lambda x : x and not '_' in x ,b)

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0 采集收起来源：python中获取对象信息
2018-10-31
慕盖茨3033461

class Person(object):

def __init__(self, name, gender, **kw):
self.name = name
self.gender = gender
for k,v in kw.iteritems():
setattr(self ,k,v)

p = Person('Bob', 'Male', age=18, course='Python')
print p.age
print p.course

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0 采集收起来源：python中获取对象信息
2018-10-31
慕盖茨3033461

class Person(object):
pass

class Student(Person):
pass

class Teacher(Person):
pass

class SkillMixin(object):
pass

class BasketballMixin(SkillMixin):
def skill(self):
return 'basketball'

class FootballMixin(SkillMixin):
def skill(self):
return 'football'

class BStudent(Person,BasketballMixin):
pass

class FTeacher(Person,FootballMixin):
pass

s = BStudent()
print s.skill()

t = FTeacher()
print t.skill()

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0 采集收起来源：python中多重继承
2018-10-31
慕盖茨3033461

import json

class Students(object):
def __init__(self,name):
self.name =name
def read(self):
return self.name
s = Students(r'["Tim", "Bob", "Alice"]')

print json.load(s)

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0 采集收起来源：python中多态
2018-10-31
慕盖茨3033461

class Person(object):

def __init__(self, name, gender):
self.name = name
self.gender = gender

class Student(Person):

def __init__(self, name, gender, score):
super(Student, self).__init__(name, gender)
self.score = score

class Teacher(Person):

def __init__(self, name, gender, course):
super(Teacher, self).__init__(name, gender)
self.course = course

t = Teacher('Alice', 'Female', 'English')

print isinstance(t,Person)
print isinstance(t,Student)
print isinstance(t,Teacher)
print isinstance(t,object)

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0 采集收起来源：python中判断类型
2018-10-31
慕盖茨3033461

class Person(object):
def __init__(self, name, gender):
self.name = name
self.gender = gender

class Teacher(Person):

def __init__(self, name, gender, course):
super(Teacher,self).__init__(name,gender)
self.course =course
t = Teacher('Alice', 'Female', 'English')
print t.name
print t.course

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0 采集收起来源：python中继承一个类
2018-10-31
慕尼黑1448190

排序使用：
1.统一首字母为大写或小写
sorted(L1,lambda p1,p2:cmp(p1.name,p2.name))
2.忽略大小写
sorted(L1,lambda p1,p2:cmp(p1.name。upper(),p2.name.upper()))

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1 采集收起来源：python中创建实例属性
2018-10-30
慕莱坞9076050

int() 函数用于将一个字符串或数字转换为整型。

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0 采集收起来源：python中filter()函数
2018-10-30
慕盖茨3033461

class Person(object):

__count = 0
@classmethod
def how_many(cls):
return cls.__count
def __init__(self,name):
self.name = name
Person.__count +=1

print Person.how_many()

p1 = Person('Bob')

print Person.how_many()

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0 采集收起来源：python中定义类方法
2018-10-30
慕盖茨3033461

#-*- coding:utf-8 -*-
class Person(object):

def __init__(self, name, score):
self.name =name
self.__score =score

def get_grade(self):
if(self.__score>80):
return 'A-优秀'
elif(self.__score>=60):
return 'B-及格'
else:
return 'C-不及格'

p1 = Person('Bob', 90)
p2 = Person('Alice', 65)
p3 = Person('Tim', 48)

print p1.get_grade()
print p2.get_grade()
print p3.get_grade()

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0 采集收起来源：python中定义实例方法
2018-10-30

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课程须知: 本课程是Python入门的后续课程 1、掌握Python编程的基础知识 2、掌握Python函数的编写 3、对面向对象编程有所了解更佳

老师告诉你能学到什么？: 1、什么是函数式编程 2、Python的函数式编程特点 3、Python的模块 4、Python面向对象编程 5、Python强大的定制类