auto save

diy.py

+# with open(r'C:\Users\CM\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as file:
+#     a=file.readlines()
+
+# final_sum=[]
+# for i in a:        #用for...in...把每一行的数据遍历 
+#     data=i.split() #把字符串切分成更细的一个个的字符串
+#     sum=0                  #先把总钱数设为0
+#     for sales in data[1:]: #遍历列表中第1个数据和之后的数据
+#         sum=sum+int(sales)#然后依次加起来，但sales是字符串，所以要转换   
+#     result = data[0]+str(sum)+'\n' #结果就是学生姓名和总义卖款，后面加上换行符，写入的时候更清晰
+#     final_sum.append(result)  #每次把结果都补充到列表中
+
+# # 这里写入文件的时候，注意命名一个新的文件名哦       
+# with open(r'C:\Users\CM\Documents\lesson13-1\new_sales_list.txt','a',encoding='utf-8') as file:
+#     file.writelines(final_sum)
+
+# str = 'gdfghjmn cxdfgh'
+# print(str[2::2])
+# un = ()
+# print(type(un))
+# list = [2,5,3,5,1,3]
+# list2 = set(list)
+# print(list)
+# list1 = [3,21,4,36,7]
+# list1.pop()
+# list1.pop(2)
+# list1.pop()
+# print(list1)
+
+# set1 = {2,3,1,4,5}
+# set1.add(5)
+
+# print(set1)
+
+
+# list = ['dsf','uiy','nvg','qld','nyg']
+# list[3] = 'xyz'
+# print(list)
+
+
+# def name1(list):
+#     print(list[3:6]+list[2:4])
+# list = ['s','e','u','s','w','t']
+# name1(list)
+
+# list = ['dhj','qpo','adm','vse','lkh']
+# for i in range(5):
+#     if list[i] == 'adm':
+#         print(i)
+
+# list = ['r','g','q','v','s','q','k','p']
+# print(list.index(q))
+
+
+# sum = 0
+# i = 1
+# while i<10:
+#     if i == 6:
+#         continue
+#     sum += i
+#     i += 2
+# print(sum)
+
+# list = ['hgh','iuh','vdk','owk','pop']
+# list.insert(2,'pop')
+# print(list)
+
+# def name1(list):
+#     print(list[3]*list[2])
+# list = [2,5,9,4,5]
+# name1(list)
+
+# dict = {"name":"Jack","age":23,"sex":"man"}
+# dict["Address"] = "深圳"
+# print(dict)
+
+
+# x = [3,4,1,5,0,8]
+# for i in range(len(x)-1):
+#     for j in range(len(x)-i-1):
+#         if x[j] > x[j+1]:
+#             x[j],x[j+1] = x[j+1],x[j]
+# print(x)
+
+
+# sum = 0
+# i = 1
+# while i< 10:
+#     i+=2
+#     sum +=i
+# print(sum)
+# list = []
+# for i in range(2,15,3):
+#     if i == 12:
+#          break
+#     list.append(i)
+# print(list)
+
+
+# str = 'lkjhgv'
+# str1 = 'rtghbo'
+# print(str[1:2]+str1[1::2])
+
+# x = [3,4,5]
+# if x[0] > x[1]:
+#     x[0],x[1] = x[1],x[0]
+# if x[1]>x[2]:
+#     x[1],x[2] = x[2],x[1]
+# print(x)
+
+
+def te(list):
+    print(list[-5:-3])
+l= [3,5,7,2,3,5,1,3]
+te(l)
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