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')