auto save

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\David\Desktop\text.txt','w',encoding='utf-8')
+# a.write('小兰：12本\n')
+# a.write('小丽：11本\n')
+# a.write('李文：9本\n')
+# a.write('张伟：16本')
+# a.close()
+with open(r'C:\Users\David\Desktop\text.txt','a',encoding='utf-8') as a:
+
+    b = a.readline()
+     for b in a:
+        if "小强：10本" in a:
+            if"小兰：12本" in a:
+                print("数据在文件中")
\ No newline at end of file

first.py

+# file=open(r'C:\Users\David\Desktop\text.txt','r',encoding='utf-8')
+# a=file.read()
+# print(a)
+# file.close()
+
+# with open(r'C:\Users\David\Desktop\text.txt','r',encoding='utf-8') as file1 :
+#     a=file1.read()
+#     print(a)
+
+with open(r'C:\Users\David\Desktop\text.txt','r',encoding='utf-8') as file2:
+    for data in file2:
+        if "小强：10本" in data:
+            print("数据在文件中")
+
+