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\Ding\Desktop\新建文件夹\book.txt","w",encoding="utf-8")
+# a.write('小兰：12本\n小丽：11本\n李文：9本\n张伟：16本')
+# a.close()
+# with open(r'C:\Users\Ding\Desktop\新建文件夹\book.txt','a',encoding='utf-8') as a:
+#     a.write('\n小强：12本\n李明：15本')
+c=''
+with open(r'C:\Users\Ding\Desktop\新建文件夹\book.txt','r',encoding='utf-8') as a:
+    for b in a:
+        if '小强：12本' in b:
+            b=b.replace('小强：12本','小强：11本')
+        c+=b
+
+with open(r'C:\Users\Ding\Desktop\新建文件夹\book.txt','w',encoding='utf-8') as a:
+    a.write(c)
+
+with open(r'C:\Users\Ding\Desktop\新建文件夹\book.txt','r',encoding='utf-8') as a:
+    d=a.read()
+    print(d)
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