auto save

diy2.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'
+# #open函数，打开或者创建一个文件
+# file_1 = open(r'F:\bellcodePython\test.txt','w',encoding='utf-8')
+
+# #写入文件
+# file_1.write('胖汉语:200')
+
+# #关闭文件
+# file_1.close()
+
+new_data = ''
+with open(r'F:\bellcodePython\test.txt','r',encoding='utf-8') as file_1:
+    for data in file_1:
+        if "胖汉语" in data:
+            data = data.replace('胖汉语:200','胖汉语:100')
+        new_data += data
+        print(new_data)
+
+with open(r'F:\bellcodePython\test.txt','w',encoding='utf-8') as file_1:
+    file_1.write(new_data)
\ No newline at end of file