auto save

diy.py

 # 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：9本'、'张伟：16本'
+# # 打开或创建文件
+# file1 = open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8')
+# # 写入数据
+# file1.write('小兰：12本\n')
+# file1.write('小丽：11本\n')
+# file1.write('李文：9本\n')
+# file1.write('张伟：16本\n')
+# #关闭文件
+# file1.close()
+
+# file1 = open(r'C:\Users\Administrator\Desktop\test.txt','a',encoding='utf-8')
+# file1.write('小贝：18本\n')
+# file1.write('悟空：12本\n')
+# file1.close()
+
+# with open(r'C:\Users\Administrator\Desktop\test.txt','a',encoding='utf-8') as file1:
+#     file1.write('诺依：18本\n')
+#     file1.close()
+new_date=''
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file1:
+    for date in file1:
+        if '诺依：18本' in date:
+            date = date.replace('诺依：18本','诺依：20本')
+        new_date += date
+with open(r'C:\Users\Administrator\Desktop\test.txt','w',encoding='utf-8') as file1:
+    file1.write(new_date)
+with open(r'C:\Users\Administrator\Desktop\test.txt','r',encoding='utf-8') as file1:
+    a = file1.read()
+    print(a)
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