docs: 2026-04-21作业

2026-04-21/2026-04-21_hw_2.py

@@ -0,0 +1,19 @@
+from flask import *
+
+
+app = Flask(__name__)
+
+@app.route("/")
+@app.route("/filters/")
+def use_of_filters():
+    num = -2.3
+    li = [2, 1, 5, 6, 7, 4, 4]
+    string = 'flask'
+    return render_template('2026-04-21_hw_2.html', num=num, li=li, string=string)
+
+@app.template_filter()          # 注册自定义过滤器
+def reverse(data):              # 自定义过滤器
+    return data[::-1]
+
+if __name__ == "__main__":
+    app.run()