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AttributeError: ResultSet object has no attribute 'find_all' - Web scraping - Beautiful Soup [duplicate]

I'm scraping a table from a Wikipedia page and it is showing error: attribute error. Here is my code:

right_table=soup.find_all('table',class_="nowraplinks collapsible autocollapse navbox-inner")
print(right_table)
print(type(right_table)) <class 'bs4.element.resultset'>
I want to iterate into each row, but it is showing error 
for row in right_table.find_all('tr'):
    print(row)
The error is:
  
AttributeError: ResultSet object has no attribute 'find_all'. You're
  probably treating a list of items like a single item. Did you call
  find_all() when you meant to call find()?
Welcome to both stackoverflow and BeautifulSoup.
The result of a find_all will be a list. For which you can not apply find_all() again as it will be going for a list. 
You have to do something like (if you have only one table), 
right_table=soup.find('table',class_="nowraplinks collapsible autocollapse navbox-inner")
for row in right_table.find_all('tr'):
    print(row)
or if you have multiple tables you need to add another for loop, like,
right_table=soup.find('table',class_="nowraplinks collapsible autocollapse navbox-inner")
for table in right_table:    
   for row in table.find_all('tr'):
        print(row)
Hope this helps! Cheers!