save project

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'
+# a=open(r'C:\Users\Administrator\Desktop\新建文本文档.txt',"w",encoding="utf-8")
+# a.write('小兰：12本')
+# a.close()
+
+# with open(r'C:\Users\Administrator\Desktop\新建文本文档.txt',"a",encoding="utf-8") as b:
+#     b.write('小丽：11本\n')
+#     b.write('李文：9本\n')
+#     b.write('张伟：16本\n')
+
+d=""
+with open(r'C:\Users\Administrator\Desktop\新建文本文档.txt',"r",encoding="utf-8") as c:
+    for i in c:
+        if '小兰：12本' in i:
+            i=i.replace('小兰：12本','小兰：10本')    
+        d+=i
+print(d)
+
+with open(r'C:\Users\Administrator\Desktop\新建文本文档.txt',"w",encoding="utf-8") as b:
+    b.write(d)
+