Update app.py

app.py

@@ -1,4 +1,11 @@
-from flask import Flask, render_template_string
+import subprocess
+import sys
+
+try:
+    from flask import Flask, render_template_string
+except ImportError:
+    subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'flask'])
+    from flask import Flask, render_template_string
 
 app = Flask(__name__)
 
@@ -36,4 +43,4 @@ def home():
     return render_template_string(html_content)
 
 if __name__ == '__main__':
-    app.run(debug=True,port=7860)
+    app.run(debug=True, port=7860)