python期末考试复习

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')