python练手题目

import sys
import re
# 输出
# print ('helloword')
# print(100+300)

# 输入
# name = str(input('输入名字'))
# print('你的名字是',name)

# 转义字符
# print('I\n','am\t','ok')

# 换行符
# print('''line1
# ... line2
# ... line3''')

# and,or
# a=1
# b=2
# c=2
# if a==b or a==c:
#     print('true')
# if a==b or b==c:
#     print('false')

# 输出格式化字符串,输出变量和常量和字符串混合的内容
# print('Hello, %s' % 'world')

# %s格式化把任何数据类型转化成字符串
# print('age:%s.gender:%s'%(25,True))
# print('age:%s.gender:%s %%'%(25,True))#当%是普通字符时

# 输出
# print ('helloword')
# print(100+300)

# 输入
# name = str(input('输入名字'))
# print('你的名字是',name)

# 转义字符
# print('I\n','am\t','ok')

# 换行符
# print('''line1
# ... line2
# ... line3''')

# and,or
# a=1
# b=2
# c=2
# if a==b or a==c:
#     print('true')
# if a==b or b==c:
#     print('false')


# 输出格式化字符串,输出变量和常量和字符串混合的内容
# print('Hello, %s' % 'world')

# %s格式化把任何数据类型转化成字符串
# print('age:%s.gender:%s'%(25,True))
# print('age:%s.gender:%s %%'%(25,True))#当%是普通字符时

#打印
# n = 123
# f = 456.789
# s1 = 'Hello, world'
# s2 = 'Hello, \'Adam\''
# s3 = r'Hello, "Bart"'
# s4 = r'''Hello,Lisa!'''
# print(n)
# print(f)
# print(s1)
# print(s2)
# print(s3)
# print(s4)


#将字符串转换成ascall码值
# print(ord("a"))
# print(ord("A"))
# print('\u4e2d\u6587')

#打印不同编码
# print('ABC'.encode('ascii'))
# print('中文'.encode('utf-8'))

#list
# mate=['one','two','three','four','five','six','seven']
# print(mate[0])
# print(mate[-1])
# mate.append('eait')#添加
# mate.insert(5,'6')#插入
# print(mate)
# mate.pop(3)
# print('删除后')#删除
# print(mate)
# mate[2]='replace'
# print(mate)
# print('list中还是list')
# listtext=[1,2,3,4,5,['a','b','c'],5,6]
# print(len(listtext))
# print(listtext)

#元组tuple，代码里面的数值不可以改变
# mate=('one','tow','three')
# print(mate)
# print(mate[1])
# t=()#空tuple
# y=(1,)#定义一个只有一个元素的tuple
# print(y)

#可以变的tuple
# u = ('a', 'b', ['A', 'B'])
# u[2][0]='s'
# u[2][1]='d'
# print(u)

#for循环
# names=[1,2,3,4,5]
# for name in names:
#     print(name)

# sum=0
# for x in [1,2,3,4,5,6,7,8,9]:
#     sum=sum+x
# print(sum)

# sum=0
# for x in range(101):
#     sum=x+sum
# print(sum)

# while循环
# sum = 0
# n = 99
# while n > 0:
#         sum = sum+n
#         n = n-2
# print(sum)

#dict字典，就是键值对
# name={'mic':1,'wula':0}
# names={'lili':'乌鸡国','lala':'ing大'}
# print(name['mic'])
# print(names['lili'])
# name['mic']=12#可以赋值
# print(name['mic'])
# print(name)
# print('jjj' in name)#判断是不是有这个字段
# print(name.get('lilis','值不存在'))
# name.pop('wula')#删除掉一个键值对
# print(name)

#特殊字典set，不存储值，只有键
# s =set([1,2,3])
# d=set([1,2,3,4,5,6,2,3,44])
# print(s)
# print(d,'自动不显示重复值')
# s.remove(1)#删除数值
# print(s)
# #打印交集并集很好用
# print(s&d)
# print(s|d)

# 内置函数
# print(abs(-10))
# print(max(1,2,4,5,6,7,23))
# print(min(1,2,4,5,6,7,23))

#数据类型转换
# print(int('223'))
# print(hex(120))#16进制打印

#自定义函数
#终端内调用才有用
# def abs(x):
#     if x>=0:
#         return x
#     else:
#         return-x

# def power(x,n):#求平方
#     s=1
#     while n>0:
#         n=n-1
#         s=s*x
#     return s

# def stuinfo(name,gender,age=6,city='南昌'):#默认值
#     print('名字:',name)
#     print('年龄',age)
#     print('居住地',city)
#     print('gender',gender)

# def sum(number):#可变参数参数用一个列表装进去
#     s=0
#     for n in number:
#         s=s+n*n
#     return(s)

# def sums(*number):#可变参数
#     s=0
#     for n in number:
#         s=s+n*n
#     return(s)


#递归,函数内部调用自身就是递归,计算阶乘
# def fact(n):
#         if n==1:
#             return 1
#         return n*fact(n-1)

# 打印数列1到99
# num=[]
# a=1
# while a<100:
#     num.append(a)
#     a=a+2
# print(num)

#打印99乘法表
# for i in range(1,10):
#     for j in range(1,10):
#         print(i,'*',j,'=',i*j)

#切片
# l=[1,2,3,4,5,6,7,8,9,10]
# print(l[0:2])#取前两个值
# print(l[-2:-1])#取倒数第二个开始一个值
# print(l[::3])#每三个取一个

# 列表生成式
# print(list(range(1,11)))

# 迭代器
#生成1的平方，2的平方....
# list=[1,2,3,4]
# it = iter(list)
# for x in it:
#     print(x*x)

# list = [1,2,3,4]
# it=iter(list)   #创建迭代对象
# print(next(it)) #输出迭代的下一个元素
# print(next(it))

# 生成器
# L = [x * x for x in range(10)]#生成一个对象
# print(L)#调用

#高阶函数
# def add(x,y,f):#定义函数调用
#     print(f(x) + f(y))
# add(-5,6,abs)

#map reduce
# def f(x):
#     return(x*x)#定义一个平方函数
# r=map(f,[1,2,3,4,5,6,7,8,9])#使用map函数方法对这个数列进行调用
# print(list(r))






# def cuboid(x,y,h):
#     print('长方体体积为',x*y*h)
#     print('长方体表面积是',(x*y+x*h+y*h)*2)
# i=int(input('输入宽'))
# j=int(input('输入长'))
# k=int(input('输入高'))
# cuboid(i,j,k)
#文件读写练写
#f = open('public/txt/demo.txt')
#while True:
#    lines=f.readlines()
#    if not lines:
 #       break
  #      pass
    
f.close()