20181205作业

作业1

a = "python的创始人是Guido"
print (a[(a.index('G')):(len(a))])
print (a[(len(a)):(a.index('G')-1):-1])
print(a[::3])

作业2

a = '你'
b = '最帅'
c = a + b
d = a+b+b+b
print(c)
print(d)

作业3

from random import *
for i in range(10):
     a = randint(0,1000)
     a = str (a)
     if a is a[::-1] :
          print (a)

作业4

for x in range(20):
     for y in range(33):
          for z in range(100):
               a = x+y+z
               b = 5*x+3*y+1/3*z
               if a == 100 and b == 100 :
                    print(x,y,z)

作业5

a = input ( '请输入一段字符串' )
x = 0
y = 0
for i in a:
     if 'a' <= i <= 'z' or 'A' <= i <= 'Z':
          x += 1
     if '0' <= i <= '9' :
          y += 1
print('字母的个数是{}，数字的个数是{}。'.format(x,y))

作业6

y,m = eval ( input ( '请输入一个年月' ) )
if y < 1990 :
     print ( '你输入的年份有误！' )
d = 1
for i in range (y+1):
     if i > 1990 :
          if i % 4 == 0 and i % 100 != 0 or i % 400 == 0 :
               d += 366
          else :
               d += 365
     else :
          continue
for n in range ( m ):
     if n in [ 1 , 3 , 5 , 7 , 8 , 10 , 12 ] :
          d += 31
     elif n in [ 4 , 6 , 9 , 11 ] :
          d += 30
     elif n == 2 :
          if y % 4 == 0 and y % 100 != 0 or y % 400 == 0 :
               d += 29
          else :
               d += 28
f = d % 7
print ( f )