auto save

diy4.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'
+# file_1 = open(r'D:\bellcode\test.txt','a',encoding='utf-8')
+
+# #写入数据
+# file_1.write('小蓝:32本\n')
+
+# #关闭文件
+# file_1.close()
+
+new_data = ''
+with open(r'D:\bellcode\test.txt','r',encoding='utf-8') as file_1:
+    for data in file_1:
+        if "李文:9本" in data:
+            data = data.replace('李文:9本','李文:11本')
+        new_data += data
+
+with open(r'D:\bellcode\test.txt','w',encoding='utf-8') as file_1:
+    file_1.write(new_data)
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