期末考试复习
补修的python跟着大一一起学，考试肯定不会出难，于是就敲了一些代码，把他们放到博客上，来记录一下
代码都是一段一段的，且python代码不是很多，所以我都写到了一个文件里，作为练习
# python期末考试编程题
# 往文件写东西
# fp = open(r'file/test.txt','a+')
# print('hellow',file=fp)
# fp.close()
# x = list(range(500))
# print(x)
# for item in x:
# t = 5**5
# print(item)
# 优化上面代码
# x = list(range(100))
# t = 5**5
# for item in x:
# print(item)
# print(t)
# 生成随机数对偶数下标并降序排列，奇数下标不变
# import random
# x = [random.randint(0,100) for i in range(20)]
# print(x)
# y = x[::2]
# print(y)
# y.sort(reverse=True)
# x[::2]=y
# print(x)
# def join(list,sep=None):
# return (sep or ',').join(list)
# print(join(['1','b','c'])) # 1,b,c
# print(join(['1','b','c'],':')) # 1:b:c
# def Sum(a,b=3,c=5):
# return sum([a,b,c])
# print(Sum(a=8,c=2))
# print(Sum(8))
# print(Sum(8,2))
# # 13
# # 16
# # 15
# def Sum(*p):
# return sum(p)
# print(Sum(3,5,8))
# print(Sum(8))
# print(Sum(8,2,10))
# # 16
# # 8
# # 20
# # 编写函数判断奇偶数
# import math
# def IsPrime(v):
# n = int(math.sqrt(v)+1)
# for i in range(2,n):
# if v%i==0:
# return 'No'
# else:
# return 'Yes'
# print(IsPrime(21))
# # 模拟内置sorted函数
# def Sorted(v):
# t=v[::]
# r=[]
# while t:
# tt = min(t)
# r.append(tt)
# t.remove(tt)
# return r
# a = ['1','2','3','4','5','6','1','2','3','6','5']
# print(Sorted(a))
# # 生成10个随机数，对前十个升序，对后十个降序
# import random
# x = [random.randint(0,100) for i in range(20)]
# print(x)
# y=x[0:10]
# y.sort() #原地排序
# x[0:10]=y
# y=x[10:20]
# y.sort(reverse=True)
# x[10:20]=y
# print(x)
# # #判断是否为闰年
# x=input('Please input an integer of 4 digit meaning the year:')
# x=eval(x)
# print(x)
# if x%400==0 or (x%4 ==0 and not x%100==0):
# print('Yes')
# else:
# print('No')
# # 计算分段函数
# x = input('Please input x:')
# x = eval(x)
# if x<0 or x>=20:
# print(0)
# elif 0<=x<=5:
# print(x)
# elif 5<=x<10:
# print(3*x-5)
# elif 10<=x<20:
# print(0.5*x-2)
# # 下列程序不能运行，因为是只读属性
# class Test:
# def _init_(self,value):
# self._value=value
# @property
# def value(self):
# return self._value
# t = Test(3)
# t.value = 5
# print(t.value)
# # 统计数字出现频率
# import random
# x = [random.randint(1,20) for i in range(50)]
# #print(x)
# r = dict()
# #print(r)
# for i in x:
# r[i] = r.get(i,0)+1
# #print(r)
# for k,v in r.items():
# print(k,v)
# # 程序文件名
# def main():
# if __name__=='__main__':
# print(1)
# else:
# print(2)
# main()
# a=[1,2,3,4]
# print(a)
# print(a[-4])
# x= [111,2,33]
# x=sorted([111,2,33])
# key = lambda x: -len(str(x))
# print(key)
# print(max([1111,2,222]))
# print((3,))
# print({1,2,})
# print([1,2,])
# print([i for i in range(100)if i%13 == 0])
# x=[1,3,5,7,1,2]
# x[len(x)+2:]=[1,2]
# print(x)
# def expend_list(list,num):
# if len(list)>num:
# return
# for i in range(1,):
print(132+321)
print('132'+'321')