auto save

1.py

+c = [[0 for i in range(2)] for i in range(11)]  #存放奇数个5和偶数个5的二维列表
+c[1][0] = 9                           #一位数中包含偶数个5的个数
+c[1][1] = 1                           #一位数中包含奇数个5的个数
+k = 9
+n = 4
+for i in range(2,n+1):                   
+    if i == n:
+        k = k-1 
+    c[i][0] = c[i-1][1] + k * c[i-1][0]
+    c[i][1] = k*c[i-1][1] + c[i-1][0]
+print(c)
\ No newline at end of file

2.py

+import math
+print(math.sqrt(0.2))
\ No newline at end of file

3.py

+import turtle
+turtle.circle(80,-360)
+turtle.circle(-80)
+turtle.forward(160)
+turtle.circle(80)
+turtle.circle(-80)
+turtle.done()
\ No newline at end of file

quiz.py

 # 勇于挑战的创造师，请运行以下代码，看看能不能删掉水果列表中的香蕉，运行结果是什么呢？
 # 勇于挑战的创造师，请运行以下代码，看看能不能删掉水果列表中的香蕉，运行结果是什么呢？
 list=['苹果','香蕉','西瓜','香蕉','桃子','香蕉']
 list=['苹果','香蕉','西瓜','香蕉','桃子','香蕉']
-for i in range(len(list)):
-    if "香蕉" in list:
-        list.remove("香蕉")
+while True:
+    try:
+        list.remove('香蕉')
+    except:
+        break
 print(list)
 print(list)