<form action="" method="POST" ><button class="btn btn-danger" type="submit" name="delete" value="{{  item2  }}"><span class="glyphicon glyphicon-trash"></span> Delete</button> </form>

@app.route('/', methods=["GET","POST"])
def home():
    if request.method == 'POST':
        if request.form['delete'] == post_id:
            sql = "DELETE FROM test_table WHERE post_id = " + post_id +";"
            c.execute(sql)
            return redirect("/")