Python-day17

1、查看保留字

import keyword
print(keyword.kwlist)

2、小数相加

from decimal import Decimal
print(Decimal('1.1')+Decimal('1.1'))

3、数据类型转换

name='cecilia'
age=1
print('我叫{}，今年{}岁'.format(name,age))
print(f'我叫{name}，今年{age}岁')
print('我叫'+name+'，今年'+str(age)+'岁')

4、两数之和

a=int(input('num1='))
b=int(input('num2='))
c=a+b
print(c)

def add(a,b):
    c=a+b
    return c
x=int(input('x='))
y=int(input('y='))
print(add(x,y))

5、整除

x=int(input('x='))
y=int(input('y='))
print(x//y)

6、解包赋值

num1,num2,num3=10,20,30
print(num1,num2,num3)
num1,num2=num2,num1
print(num1,num2)

7、条件表达式

num1=int(input('num1='))
num2=int(input('num2='))
print(str(num1)+'>='+str(num2) if num1>=num2 else str(num1)+'<='+str(num2))

8、range()

s1=range(12)
s2=range(4,12)
s3=range(6,20,2)
print(list(s1))
print(list(s2))
print(list(s3))
print(tuple(s1))
print(set(s1))

9、100以内偶数和

i=1
sum=0
while i<=100:
    if not bool(i%2):
        sum=sum+i
    i+=1
print(sum)

sum=0
for i in range(101):
    if not bool(i%2):
        sum=sum+i
print(sum)

10、类的浅拷贝和深拷贝

class CPU:
    pass
class Disk:
    pass
class Computer:
    def __init__(self,cpu,disk):
        self.cpu=cpu
        self.disk=disk
cpu1=CPU()
cpu2=cpu1
disk=Disk()
computer=Computer(cpu1,disk)
import copy
computer2=copy.copy(computer)
computer3=copy.deepcopy(computer)
print(computer,computer.cpu,computer.disk)
print(computer2,computer2.cpu,computer2.disk)
print(computer3,computer3.cpu,computer3.disk)

11、模块导入

12、以主程序形式运行

13、常用内置模块

import sys
print(sys.getsizeof(88))
import time
print(time.time())
print(time.localtime(time.time()))
import urllib.request
print(urllib.request.urlopen('https://music.163.com').read())

14、schedule，time模块应用

import schedule
import time
def fun():
    print('hh--')
schedule.every(3).seconds.do(fun)
while True:
    schedule.run_pending()
    time.sleep(1)

15、文件的读写

file=open('a.txt.txt','r')
print(file.readlines())
file.close()

16、常用文件打开模式

file=open('b.txt','w')
file.write('hello')
file.close()

file=open('b.txt','a')
file.write('hello')
file.close()