python - render_template() takes exactly 1 argument -

i getting 500 error when click submit following view. why getting error , how fix it?

from flask import flask, render_template flask import request, jsonify  app = flask(__name__)  @app.route('/', methods=['get', 'post']) def homepage():     if request.method == 'post':         f1 = request.form['firstverb']         f2 = request.form['secondverb']         return render_template('index.html', f1, f2)     return render_template('index.html')  if __name__ == "__main__":     app.run(); 

<form class="form-inline" method="post" action=""> <div class="form-group">     <label for="first">first word</label>     <input type="text" class="form-control" id="first" name="firstverb"> </div> <div class="form-group">     <label for="second">second word</label>     <input type="text" class="form-control" id="second" name="secondverb" > </div> <button type="submit" class="btn btn-primary">run it</button> </form>  {{ f1 }} {{ f2 }} 

first off when getting 500 error should consider running app debug mode. building app , debugging, no reason keep off hide what's going on you.

if __name__ == "__main__":     app.run(debug=true) 

now gets more exciting:

127.0.0.1 - - [08/jul/2015 14:15:04] "post / http/1.1" 500 - traceback (most recent call last): ...   file "/tmp/demo.py", line 11, in homepage     return render_template('index.html', f1, f2) typeerror: render_template() takes 1 argument (3 given) 

there problem. should refer documentation render_template , see accepts 1 positional argument (the template name), rest of arguments (in **context) provided keyword arguments. otherwise in template there no way reference variables passed in (you have give them explicit names), fixing call to:

    return render_template('index.html', f1=f1, f2=f2) 

that should solve problems.

finally, please refrain asking questions can trivially solved tiny bit of work (that can gathered better reading of provided documentation), , please go through entire flask tutorial grasp basics of framework.