Python核心编程练习题

1.输入一个数值，判断是否为正数，负数，小数，以及字符串

 import re

 def is_number(num):
     pattern = re.compile(r'^[-+]?[-0-9]\d*\.\d*|[-+]?\.?[0-9]\d*$')
     result = pattern.match(num)
     if result:
         return True
     else:
         return False

 while True:
     i = input("Enter Number:")
     if i == 'q':
         print('-----End----')
         break
     elif is_number(i):
         if type(eval(i)) == int:
             i = int(i)
             if i > 0:
                 print('{} is positive number'.format(i))
             elif i < 0:
                 print('{} is negative number'.format(i))
             elif i == 0:
                 print('{} is Zero'.format(i))
         else:
             print('{} is decimals'.format(i))
     else:
         print('{} is a string'.format(i))

2:输入五位数组成一个列表，并求和

 lists = []
 i = 0
 while i < 5:
     list_num = input('enter number:')
     if list_num == 'q':
         break
     else:
         list_num = int(list_num)
         lists.append(list_num)
         print(lists)
         sum_num = sum(lists)
         print('sum:{}'.format(sum_num))
         i += 1