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'
+# l=open(r'C:\Users\TH\Desktop\test.txt','w',encoding='utf-8')
+# l.write('小兰:12本\n')
+# l.write('小丽:11本\n')
+# l.write('李文:9本\n')
+# l.write('张伟:16本\n')
+# l.close()
+# with open(r'C:\Users\TH\Desktop\test.txt','a',encoding='utf-8') as l:
+#     l.write('小兰:11本\n')
+# l=open(r'C:\Users\TH\Desktop\test.txt','r',encoding='utf-8')
+# h=l.read()
+# print(h)
+with open(r'C:\Users\TH\Desktop\test.txt','r',encoding='utf-8') as l:
+    for i in l:
+        if '小兰:12本' in i:
+            print('数据在文件中')
+            i=i.replace('小兰:12本','小兰:10本')
+            print(i)
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