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'
+file1= open(r'C:\Users\cm\Desktop\book.txt','w',encoding='utf-8')
+file1.write('小兰:12本\n')
+file1.write('小丽:11本\n)
+file1.write('李文:9本\n')
+file1.write('张伟:16本\n')
+file1.close()

diy2.py

+file= open(r'C:\Users\cm\Desktop\book.txt','w',encoding='utf-8')
+file.write('小强:10本\n')
+file.write('李明:15本\n')
+file.close()
\ No newline at end of file

diy3.py

+with open(r'C:\Users\cm\Desktop\book.txt','w',encoding='utf-8') as file1:
+    for data in file1:
+        if '小强: 10本' in data:
+            prit('小强数据在文件中')
+        if '小兰: 12本' in data:
+            prit('小兰数据在文件中')
+        
\ No newline at end of file

diy4.py

+new_data=''
+with open(r'C:\Users\cm\Desktop\book.txt','w',encoding='utf-8') as file1:
+    for data in file1:
+        if '小强: 10本' in data:
+            data=data.replace('小强: 10本'，'小强:11本')
+        if '小兰: 12本' in data:
+            data=data.replace('小兰: 12本'，'小兰:14本')
+        new_data +=data
+
+with open(r'C:\Users\cm\Desktop\book.txt','w',encoding='utf-8') as file1:
+    file1.write(new_data)
+
+with open(r'C:\Users\cm\Desktop\book.txt','w',encoding='utf-8') as file1:
+    a=file1.read()
+    print(a)
+    
\ No newline at end of file