空列表的 Python 和 Pandas NoneType 错误

Question

I have a form which takes a list of inputs via html (searchinput) and adds it to a query in python.

    searchterms = []
    searchterms = request.values.get('searchinput').strip().split(', ')
    filtered = pd.concat([df.query("Drug.str.contains('|'.join(@searchterms), na=False, case=False, regex=True)", engine='python')])
    return render_template('drugsafety.html', tables=[filtered.to_html(classes='data')], titles=['na', 'Drug List'])

This gives

AttributeError: 'NoneType' object has no attribute 'strip'

If I then feed in a value like searchterms = ["foobar"] it works and will even take the form inputs without error.

How can I get around this initial needing a value to boot it into life?

edit

    searchterms = []
    if searchterms is not None:
        searchterms = request.values.get('searchinput').strip().split(', ')
        filtered = pd.concat([ df.query("Drug.str.contains('|'.join(@searchterms), na=False, case=False, regex=True)", engine='python')])            
    else:  
        searchterms = ["Foo"]

Thanks for any help

Answer 1

Try to put default value ( '' ) in .get :

# put `''` in .get():
searchterms = request.values.get('searchinput', '').strip().split(', ')