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(r"C:\Users\10839\Desktop\book.txt",'w',encoding='utf-8')as file:
+    file.write('小兰：12本\n小丽：11本\n李文：9本\n张伟：16本\n')
+#file1.close()
+with open(r"C:\Users\10839\Desktop\book.txt",'a',encoding='utf-8')as file:
+    file.write('小强：20本')
+with open(r"C:\Users\10839\Desktop\book.txt",'r',encoding='utf-8')as file:
+    a=file.read()
+    print(a)
+new_data=''
+with open(r"C:\Users\10839\Desktop\book.txt",'r',encoding='utf-8')as file:
+    for data in file:
+        if '小兰：12本' in data:
+            #print('数据找到了)
+            data=data.replace('小兰：12本','小兰：21本')
+        print(data)
+        new_data+=data
+with open(r"C:\Users\10839\Desktop\book.txt",'w',encoding='utf-8')as file:
+    file.write(new_data)
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