def peven(n):
? ? i = 0
? ? s = 0.0
? ? for i in range(2,n + 1,2):
? ? ? ? s += 1.0 / i
? ? return s

def podd(n):
? ? s = 0.0
? ? for i in range(1, n + 1,2):
? ? ? ? s += 1.0 / i
? ? return s

def dcall(fp,n):
? ? s = fp(n)
? ? return s

if __name__ == '__main__':
? ? n = int(input('input a number: '))
? ? if n % 2 == 0:
? ? ? ? sum = dcall(peven,n)
? ? else:
? ? ? ? sum = dcall(podd,n)
? ? print (sum)

l=['moyu','niupi','xuecaibichi','shengfaji','42']
for i in range(len(l)):
? ? print(l[i])

if __name__ == '__main__':
? ? person = {"li":18,"wang":50,"zhang":20,"sun":22}
? ? m = 'li'
? ? for key in person.keys():
? ? ? ? if person[m] < person[key]:
? ? ? ? ? ? m = key

? ? print ('%s,%d' % (m,person[m]))

l=['baaa','aaab','aaba','aaaa','abaa']
l.sort()
print(l)

if __name__ == '__main__':
? ? i = 0
? ? j = 1
? ? x = 0
? ? while (i < 5) :
? ? ? ? x = 4 * j
? ? ? ? for i in range(0,5) :
? ? ? ? ? ? if(x%4 != 0) :
? ? ? ? ? ? ? ? break
? ? ? ? ? ? else :
? ? ? ? ? ? ? ? i += 1
? ? ? ? ? ? x = (x/4) * 5 +1
? ? ? ? j += 1
? ? print(x)

? ? for p in range(5):
? ? ? ? x=(x-1)/5*4
? ? print(x)

a = 809
for i in range(10,100):
? ? b = i * a
? ? if b >= 1000 and b <= 10000 and 8 * i < 100 and 9 * i >= 100:
? ? ? ? print(b,' = 800 * ', i, ' + 9 * ', i)


for i in range(10,100):
? ? if 8*i>99 or 9*i<100:
? ? ? ? continue
? ? if 809*i==800*i+9*i:
? ? ? ? print(i)
? ? ? ? break

n=eval('0o'+str(int(input('八進制輸入：'))))
print(n)

if __name__ == '__main__':
? ? sum = 4
? ? s = 4
? ? for j in range(2,9):
? ? ? ? print (sum)
? ? ? ? if j <= 2:
? ? ? ? ? ? s *= 7
? ? ? ? else:
? ? ? ? ? ? s *= 8
? ? ? ? sum += s
? ? print('sum = %d' % sum)

delimiter = ','
mylist = ['Brazil', 'Russia', 'India', 'China']
print(delimiter.join(mylist))

if __name__ == '__main__':
? ? zi = int(input('輸入一個數(shù)字:'))
? ? n1 = 1
? ? c9 = 1
? ? m9 = 9
? ? sum = 9
? ? while n1 != 0:
? ? ? ? if sum % zi == 0:
? ? ? ? ? ? n1 = 0
? ? ? ? else:
? ? ? ? ? ? m9 *= 10
? ? ? ? ? ? sum += m9
? ? ? ? ? ? c9 += 1
? ? print ('%d 個 9 可以被 %d 整除 : %d' % (c9,zi,sum))
? ? r = sum / zi
? ? print ('%d / %d = %d' % (sum,zi,r))

a='guangtou'
b='feipang'
print(b+a)

if __name__ == '__main__':
? ? class student:
? ? ? ? x = 0
? ? ? ? c = 0
? ? def f(stu):
? ? ? ? stu.x = 20
? ? ? ? stu.c = 'c'
? ? a= student()
? ? a.x = 3
? ? a.c = 'a'
? ? f(a)
? ? print(a.x,a.c)

for i in range(3):
? ? print('*'*int(input('input a number: ')))

n=input()
n = str(n)
a=[]
for i in range(4):
? ? a.append((int(n[i])+5)%10)
a[0],a[3]=a[3],a[0]
a[1],a[2]=a[2],a[1]
print ("".join('%s' %s for s in a))

#list ?
#新建列表 ?
testList=[10086,'中國移動',[1,2,4,5]] ?

#訪問列表長度 ?
print (len(testList) ?)
#到列表結(jié)尾 ?
print (testList[1:])
#向列表添加元素 ?
testList.append('i\'m new here!') ?

print (len(testList) ?)
print (testList[-1] ?)
#彈出列表的最后一個元素 ?
print (testList.pop(1) ?)
print (len(testList) ?)
print (testList ?)
#list comprehension ?
#后面有介紹，暫時掠過 ?
matrix = [[1, 2, 3], ?
[4, 5, 6], ?
[7, 8, 9]] ?
print (matrix ?)
print (matrix[1] ?)
col2 = [row[1] for row in matrix]#get a ?column from a matrix ?
print (col2 ?)
col2even = [row[1] for row in matrix if ?row[1] % 2 == 0]#filter odd item ?
print (col2even)

if __name__ == '__main__':
? ? import time
? ? print (time.ctime(time.time()))
? ? print (time.asctime(time.localtime(time.time())))
? ? print (time.asctime(time.gmtime(time.time())))

if __name__ == '__main__':
? ? import time
? ? start = time.time()
? ? for i in range(3000):
? ? ? ? print(i)
? ? end = time.time()

? ? print (end - start)

if __name__ == '__main__':
? ? import time
? ? start = time.clock()
? ? for i in range(100):
? ? ? ? print(i)
? ? end = time.clock()
? ? print('different is %6.3f' % (end - start))

if __name__ == '__main__':
? ? import time
? ? import random

? ? play_it = input('do you want to play it.(\'y\' or \'n\')')
? ? while play_it == 'y':
? ? ? ? c = input('input a character:\n')
? ? ? ? i = random.randint(0,2**32) % 100
? ? ? ? print ('please input number you guess:\n')
? ? ? ? start = time.clock()
? ? ? ? a = time.time()
? ? ? ? guess = int(input('input your guess:\n'))
? ? ? ? while guess != i:
? ? ? ? ? ? if guess > i:
? ? ? ? ? ? ? ? print('please input a little smaller')
? ? ? ? ? ? ? ? guess = int(input('input your guess:\n'))
? ? ? ? ? ? else:
? ? ? ? ? ? ? ? print('please input a little bigger')
? ? ? ? ? ? ? ? guess = int(input('input your guess:\n'))
? ? ? ? end = time.clock()
? ? ? ? b = time.time()
? ? ? ? var = (end - start) / 18.2
? ? ? ? print (var)
? ? ? ? # print 'It took you %6.3 seconds' % time.difftime(b,a))
? ? ? ? if var < 15:
? ? ? ? ? ? print ('you are very clever!')
? ? ? ? elif var < 25:
? ? ? ? ? ? print ('you are normal!')
? ? ? ? else:
? ? ? ? ? ? print ('you are stupid!')
? ? ? ? print ('Congradulations')
? ? ? ? print ('The number you guess is %d' % i)
? ? ? ? play_it = input('do you want to play it.')

from dateutil import parser
dt = parser.parse("Aug 28 2015 12:00AM")
print (dt)

s1='xuebixuebixuebixuebixuebixuebixuebixue'
s2='xuebi'
print(s1.count(s2))

if __name__ == '__main__':
? ? from sys import stdout
? ? filename = input('輸入文件名:\n')
? ? fp = open(filename,"w")
? ? ch = input('輸入字符串:\n')
? ? while ch != '#':
? ? ? ? fp.write(ch)
? ? ? ? stdout.write(ch)
? ? ? ? ch = input('')
? ? fp.close()

if __name__ == '__main__':
? ? fp = open('test.txt','w')
? ? string = input('please input a string:\n')
? ? string = string.upper()
? ? fp.write(string)
? ? fp = open('test.txt','r')
? ? print (fp.read())
? ? fp.close()

if __name__ == '__main__':
? ? import string
? ? fp = open('test1.txt')
? ? a = fp.read()
? ? fp.close()

? ? fp = open('test2.txt')
? ? b = fp.read()
? ? fp.close()

? ? fp = open('test3.txt','w')
? ? l = list(a + b)
? ? l.sort()
? ? s = ''
? ? s = s.join(l)
? ? fp.write(s)
? ? fp.close()

i = ['a', 'b']
l = [1, 2]
print (dict(zip(i,l)))