save project

diy.py

-with open(r'c:\Users\admin\Desktop\JLGJFD.txt.txt','r',encoding='utf-8') as file:
-    a=file.readlines()
-    # print(type(a[3:5]))
-    for i in a:
-        ad=i.split()
-        print(ad[0])
-        print(ad[1:])
+with open(r'C:\Users\QC\Desktop\新建文本文档.txt','w',encoding='utf-8')as qwe:
+    qwe.write('小明:21\n小可:21\n小红:21\n')
+with open(r'C:\Users\QC\Desktop\新建文本文档.txt','r',encoding='utf-8')as qwe:
+    a=qwe.read()
+    print(a)
+nqwe=''
+with open(r'C:\Users\QC\Desktop\新建文本文档.txt','r',encoding='utf-8')as qwe:
\ No newline at end of file
+    for poi in qwe:
+        if '小明:21' in poi:
+            print('数据在文件中')
+            poi=poi.replace('小明:21','小明:30')
+        nqwe+=poi
+with open(r'C:\Users\QC\Desktop\新建文本文档.txt','w',encoding='utf-8')as qwe:
+    qwe.write(nqwe)                                     
+
+    
+        
+                   
\ No newline at end of file