diff --git a/python_web/server.py b/python_web/server.py
new file mode 100644
index 0000000..23327a9
--- /dev/null
+++ b/python_web/server.py
@@ -0,0 +1,26 @@
+from flask import Flask
+from flask import request
+
+app = Flask(__name__)
+
+@app.route('/', methods=['GET', 'POST'])
+def home():
+    return '<h1>Home</h1>'
+
+@app.route('/signin', methods=['GET'])
+def signin_form():
+    return '''<form action="/signin" method="post">
+              <p><input name="username"></p>
+              <p><input name="password" type="password"></p>
+              <p><button type="submit">Sign In</button></p>
+              </form>'''
+
+@app.route('/signin', methods=['POST'])
+def signin():
+    # 需要从request对象读取表单内容：
+    if request.form['username']=='admin' and request.form['password']=='password':
+        return '<h3>Hello, admin!</h3>'
+    return '<h3>Bad username or password.</h3>'
+
+if __name__ == '__main__':
+    app.run(host="0.0.0.0", port=4321)
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