sample = """<div class="textbox">
    Buying this item will cost you 
    <img align="adsbottom" alt="1" src="/1.jpg;type=symbol"/>
    silver credits and
    <img align="adsbottom" alt="1" src="/1.jpg;type=symbol"/>
    golden credits
</div>
"""
html = BeautifulSoup(sample)
result = []
for child in html.find('div', class_='textbox').children:
    if isinstance(child, Tag):
        result.append(child.get('alt', ''))
else:
    pass
Python, BeautifulSoup — текст <div> и атрибуты <img> в правильном порядке