课程 \
Python3 进阶教程（新版）
6-7 Python正确关闭文件
# Enter a code
with open('test.txt', 'a+') as f:
f.seek(0)
content = f.readlines()
f.seek(2)
for line in content:
f.write(line)
2022-02-20
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6-6 Python往文件追加内容
# Enter a code
f = open('test.txt', 'a+')
f.seek(0)
content = f.readlines()
f.seek(2)
f.writelines(content)
f.seek(0)
con= f.readlines()
print(con)
f.close
2022-02-20
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6-5 Python把字符串写入文件
# Enter a code
f = open('test.txt', 'w')
f.readlines()
g=reverce(f)
h = open('test1.txt', 'w')
h.writelines(g)
f.close()
2022-02-19
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6-4 Python读取文件内容
# Enter a code
f = open('read.py')
content = f.readlines()
print(content)
2022-02-19
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6-3 Python打开二进制文件
# Enter a code
f = open('C:\Users\ZL\PycharmProjects\1107\慕课网\test.jpg', 'rb')
f.close()
2022-02-19
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6-2 Python打开文本文件
# Enter a code
f = open('C:\Users\ZL\PycharmProjects\慕课网\test.txt', 'r')
type(f)
f.close()
2022-02-19
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6-1 向Python程序输入内容
# Enter a code
num = input('please input number: ')
num = int(num)
result = 1
for i in range(1, num):
result = result * i
print(result)
2022-02-19
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5-3 Python导入模块
# Enter a code
import math
math.sin(0)
math.cos(0)
from math import sin,cos
sin(0)
cos(0)
2022-02-17
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5-2 Python定义模块
# Enter a code
# common.py
def say_hello(name):
print('Hello {}'.format(name))
2022-02-17
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4-6 Python类的__call__方法
# Enter a code
class Fib(object):
def __init__(self):
self.res = []
def __call__(self, num):
a = 0
b = 1
for x in range(num):
self.res.append(a)
a, b = b, a + b
return self.res
f = Fib()
print(f(10))
2022-02-17
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4-5 Python类的__slots__方法
# Enter a code
class Person(object):
__slots__ = ('name', 'gender')
def __init__(self, name, gender):
self.name = name
self.gender = gender
class Student(Person):
__slots__ = ('score',)
def __init__(self, name, gender, score):
self.name = name
self.gender = gender
self.score = score
s = Student('Bob', 'male', 59)
s.name = 'Tim'
s.score = 99
print(s.score)
2022-02-17
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4-4 Python类的数学运算
# Enter a code
def gcd(a, b):
if b == 0:
return a
return gcd(b, a % b)
class Rational(object):
def __init__(self, p, q):
self.p = p
self.q = q
def __add__(self, r):
return Rational(self.p * r.q + self.q * r.p, self.q * r.q)
def __sub__(self, r):
return Rational(self.p * r.q - self.q * r.p, self.q * r.q)
def __mul__(self, r):
return Rational(self.p * r.p, self.q * r.q)
def __truediv__(self, r):
return Rational(self.p * r.q, self.q * r.p)
def __str__(self):
g = gcd(self.p, self.q)
return '{}/{}'.format(int(self.p/g), int(self.q/g))
r1 = Rational(1, 2)
r2 = Rational(1, 5)
print(r1 + r2)
print(r1 - r2)
print(r1 * r2)
print(r1 / r2)
2022-02-17
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4-3 Python类的__len__方法
# Enter a code
class Fib(object):
def __init__(self, num):
self.res = []
self.num = num
a = 0
b = 1
for x in range(num):
self.res.append(a)
a, b = b, a + b
def __str__(self):
return str(self.res)
def __len__(self):
return self.num
f = Fib(10)
print(f)
print(len(f))
2022-02-16
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3-3 Python判断类型
# Enter a code
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
p = Person('Tim', 'Male')
s = Student('Bob', 'Male', 88)
t = Teacher('Alice', 'Female', 'English')
print(isinstance(t,Person))
print(isinstance(t,Student))
print(isinstance(t,Teacher))
print(isinstance(t,object))
2022-02-15
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3-2 Python继承类
# Enter a code
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
teacher = Teacher('Alice', 'Female', 'English')
print(teacher.name)
print(teacher.gender)
print(teacher.course)
2022-02-15
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2-5 Python类属性
# Enter a code
class Animal(object):
count = 0
def __init__(self, name, age):
self.name = name
self.age = age
Animal.count += 1
dog = Animal('wangwang', 1)
print(Animal.count)
cat = Animal('mimi', 3)
print(Animal.count)
pig = Animal('panpan', 1)
print(Animal.count)
2022-02-15
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2-9 Python定义类方法
# Enter a code
class Animal(object):
__localtion = 'Asia'
__count = 0
def __init__(self, name, age):
self.name = name
self.age = age
Animal.__count += 1
@classmethod
def get_count(cls):
return cls.__count
dog = Animal('wangwang', 1)
cat = Animal('mimi', 3)
pig = Animal('panpan', 1)
count = Animal.get_count()
print(count)
2022-02-15
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2-4 Python实例属性的初始化
# Enter a code
class Animal(object):
def __init__(self, name,age):
self.name = name
self.age = age
dog=Animal('xiaobai',1)
cat=Animal('xiaohong',2)
print(dog.name,dog.age)
print(cat.name,cat.age)
2022-02-12
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