auto save

11.py

+#使用两种方法来修改文件地址！
+#1.在地址前面加r
+#2.把地址里面的一个反斜杠写为两个反斜杠
+#r，read为只读，w，write为只写，a,append,追加
+new_d=''
+with open(r"C:\Users\DELL\Desktop\taxt.txt",'w',encoding='utf-8') as file1:
+    # file1.write("李一:20本\n")
+    # file1.write("李二:30本\n")
+    # file1.write("李三:40本\n")
+    for d in file1:
+        if '李一:10本' in d:
+            d.replace('李一:10本','李一:11本')
+    new_d+=d
+    file1.write(new_d)
+
+
+#a=open("C:\\Users\\DELL\\Desktop\\text.txt")
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