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'
+# with open(r'C:\Users\EDY\Desktop\book.txt','r',encoding = 'utf-8') as f:
+#     f.write('小强：12本\n')
+#     f.write('李明：15本\n')
+x = ''
+with open(r'C:\Users\EDY\Desktop\book.txt','r',encoding = 'utf-8') as f:
+    for i in f:
+        if '小强：12本' in i:
+            i = i.replace('小强：12','小强：11')   
+        if '小兰：12本' in i:    
+            i = i.replace('小兰：12','小兰：14')
+        x += i   
+with open(r'C:\Users\EDY\Desktop\book.txt','w',encoding = 'utf-8') as f1:  
+    f1.write(x)       
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