diff --git a/app2.py b/app2.py
new file mode 100644
index 000000000..289dd7c0c
--- /dev/null
+++ b/app2.py
@@ -0,0 +1,12 @@
+from flask import Flask, jsonify
+import random
+
+app = Flask(__name__)
+
+@app.route('/random', methods=['GET'])
+def random_number():
+    number = random.randint(1, 100)
+    return jsonify({'random_number': number})
+
+if __name__ == '__main__':
+    app.run(debug=True)
diff --git a/dict.py b/dict.py
new file mode 100644
index 000000000..475348769
--- /dev/null
+++ b/dict.py
@@ -0,0 +1,43 @@
+# 创建一个空字典
+fruits = {}
+
+# 创建一个包含一些水果及其数量的字典
+fruits = {
+    'apple': 10,
+    'banana': 5,
+    'orange': 8
+}
+# 访问字典中的值
+print(fruits['apple'])  # 输出: 10
+# 添加一个新的键值对
+fruits['mango'] = 15
+
+# 更新一个已有的键值对
+fruits['banana'] = 7
+
+print(fruits)
+# 输出: {'apple': 10, 'banana': 7, 'orange': 8, 'mango': 15}
+# 删除一个键值对
+del fruits['orange']
+
+print(fruits)
+# 输出: {'apple': 10, 'banana': 7, 'mango': 15}
+
+# 遍历字典中的键值对
+for fruit, quantity in fruits.items():
+    print(f"The quantity of {fruit} is {quantity}")
+
+# 检查键是否在字典中
+if 'apple' in fruits:
+    print("Apple is in the dictionary")
+
+if 'grape' not in fruits:
+    print("Grape is not in the dictionary")
+
+# 获取所有的键
+keys = fruits.keys()
+print(keys)  # 输出: dict_keys(['apple', 'banana', 'mango'])
+
+# 获取所有的值
+values = fruits.values()
+print(values)  # 输出: dict_values([10, 7, 15])
\ No newline at end of file
diff --git a/students.json b/students.json
new file mode 100644
index 000000000..67995e031
--- /dev/null
+++ b/students.json
@@ -0,0 +1,18 @@
+[
+    {
+        "name": "Alice",
+        "age": 23,
+        "courses": [
+            "Math",
+            "Science"
+        ]
+    },
+    {
+        "name": "Charlie",
+        "age": 24,
+        "courses": [
+            "Art",
+            "Design"
+        ]
+    }
+]
\ No newline at end of file
diff --git a/students.py b/students.py
new file mode 100644
index 000000000..87775b9f7
--- /dev/null
+++ b/students.py
@@ -0,0 +1,39 @@
+import json
+
+# 读取 JSON 文件
+with open('students.json', 'r') as file:
+    students = json.load(file)
+
+print(students)
+
+# 遍历学生列表
+for student in students:
+    name = student['name']
+    courses = student['courses']
+    print(f"Student: {name}")
+    print("Courses:")
+    for course in courses:
+        print(f" - {course}")
+
+# 添加新学生
+new_student = {
+    "name": "Charlie",
+    "age": 24,
+    "courses": ["Art", "Design"]
+}
+students.append(new_student)
+
+# 将更新后的数据写回到 JSON 文件
+with open('students.json', 'w') as file:
+    json.dump(students, file, indent=4)
+
+print("New student added.")
+
+# 删除名为 "Bob" 的学生
+students = [student for student in students if student['name'] != 'Bob']
+
+# 将更新后的数据写回到 JSON 文件
+with open('students.json', 'w') as file:
+    json.dump(students, file, indent=4)
+
+print("Student 'Bob' deleted.")
\ No newline at end of file
diff --git a/templates/index.html b/templates/index.html
index 7bee67b55..91458ae75 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -7,7 +7,7 @@
         <header class="App-header">
             <img src="{{ url_for('static', filename='Octocat.png') }}" class="App-logo" alt="logo" />
             <p>
-                GitHub Codespaces <span class="heart">♥️</span> Flask
+                GitHub Codespaces <span class="heart">♥️hello wulb</span> Flask
             </p>
             <p class="small">
                 Edit <code>templates/index.html</code> and refresh to see your changes!