1 while True: 2 str_num = input("Enter number:") 3 4 flag = True 5 dotCount = 0 6 if str_num[0] == '-': 7 str_num_copy = str_num[1:] 8 else: 9 str_num_copy = str_num 10 for ch in str_num_copy: 11 if ch>='0' and ch <= '9': 12 continue 13 elif ch == '.': 14 dotCount += 1 15 if dotCount>1: 16 flag = False 17 print("您输入的内容不规范,请重新输入") 18 break 19 continue 20 else: 21 flag = False 22 print("您输入的内容不规范,请重新输入") 23 break 24 if flag == True: 25 print(float(str_num)) 26 break 27 28 # import math 29 # while True: 30 # x = input('Enter number:') 31 # y = int(x) / 6 32 # num = math.ceil(y) 33 # print(num) 34 # # 用列表解析的方式 35 # while True: 36 # x = input('Enter number:') 37 # num = int(x) 38 # page = num // 6 39 # n = 1 if num%6!=0 else 0 40 # print(page+n) 41 42 43 #排序 44 # list1 = [5,4,3,2,1,2,3,4,5] 45 # #对list1进行排序 排序之后改变了id号 46 # l = sorted(list1)#result:[1, 2, 2, 3, 3, 4, 4, 5, 5] 47 # print(l)#[1, 2, 2, 3, 3, 4, 4, 5, 5] 48 # print(id(l),id(list1))#43557960 43558536 49 # 50 # list1 = [5,4,3,2,1,2,3,4,5] 51 # #对list1进行排序 排序之后改变了id号 52 # l = list1.sort() 53 # print(l,list1)# None [1, 2, 2, 3, 3, 4, 4, 5, 5] 54 # print(id(l),id(list1))#1790284944 43688648 55 # 56 # list1 = [5,4,3,2,1,2,3,4,5] 57 # print(id(list1))#43689032 58 # #对list1进行排序 排序之后不改变id号 59 # list1.sort() 60 # print(list1)#[1, 2, 2, 3, 3, 4, 4, 5, 5] 61 # print(id(list1))#43689032
import os #fork不支持windows上面运行 if __name__ == '__main__': pid = os.fork() print(pid)