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'
+# with open("shit.txt","w",encoding="utf-8") as f1:
+#    f1.write('小兰：12本\n')
+#    f1.write('小丽：11本\n')
+#    f1.write('李文：9本\n')
+#    f1.write('张伟：16本\n')
+# with open("shit.txt","a",encoding="utf-8") as f2:
+#     f2.write("小黄：20本\n")
+with open ("shit.txt","r",encoding="utf-8") as f3:
+    new_deta = ''
+    for data in f3:
+        if "小兰：12本" in data:
+            new_deta=new_deta+'小兰：30本\n'
+        else:
+            new_deta=new_deta+data
+    print(new_deta)
+with open ("shit.txt","w",encoding="utf-8") as f4:
+    f4.write(new_deta)
\ No newline at end of file

shit.txt

+小兰：30本
+小丽：11本
+李文：9本
+张伟：16本
+勾石：20本
\ No newline at end of file