save project

0.py

+new_b=""
+with open(r"C:\Users\XMBC\Desktop\a.txt",'w',encoding="utf-8") as a:
+    a.write("小强：10本\n")
+    a.write("李明：15本\n")
+with open(r"C:\Users\XMBC\Desktop\a.txt",'a',encoding="utf-8") as a:
+    a.write("小兰：12本\n")
+with open(r"C:\Users\XMBC\Desktop\a.txt",'r',encoding="utf-8") as a:
+    for b in a:
+        if "小强：10本" in b:
+            b=b.replace("小强：10本","小强：11本")
+        if "小兰：12本" in b:
+            b=b.replace("小兰：12本","小兰：14本")
+        new_b+=b
+# with open(r"C:\Users\XMBC\Desktop\a.txt",'r',encoding="utf-8") as a:
+#     for b in a:
+        
+#         new_b+=b
+with open(r"C:\Users\XMBC\Desktop\a.txt",'w',encoding="utf-8") as a:
+    a.write(new_b)
+