auto save

1.py

+# # print(2,3,4,5,sep=",")
+# for i in range(9):
+#     print(i,end=',')
+# print(9)
+# a=19.78
+# print("我的年龄：%.0f"%a)
+# print()
+try:
+    a=int(input("输入一个分子："))
+    b=int(input("输入分母："))
+    c=a/b
+except ZeroDivisionError:
+    print("分母不能为零")
+except TypeError:
+    print("输入错误！")
+else:
+    print(c)
\ No newline at end of file

2.py

+a=[2,1,34,4,2,3,8]
+a.sort(reverse=True)
+print(a)
+for i in range(0,len(a)-1):
+    for j in range(0,len(a)-i-1):
+        if a[j]>a[j+1]:
+            a[j],a[j+1]=a[j+1],a[j]
+print(a)
\ No newline at end of file

3.py

+c=''
+k=b.read()
+for a in k:
+    if '/a' in a:
+        a=a.replace('/a','/b')
+    c+=a

snake.py

@@ -2,10 +2,12 @@ import pygame
 
 # 初始化pygame，为使用pygame做准备
 pygame.init()
-
+bg=pygame.image.load('bg.png')
 # 创建一个窗口
 screen=pygame.display.set_mode((660,480))
 while True:
     for i in pygame.event.get():
-        if i.==pygame.QUIT:
-            exit()
\ No newline at end of file
+        if i.type==pygame.QUIT:
+            exit()
+    screen.blit(bg,(0,0))
+    pygame.display.update()
\ No newline at end of file