human
Solve the following python programming problem given the following code:
def ___sortBookmarks(visibleBookmarks, currentFile) : 
    from collections import defaultdict 
    def lineSortFn(bookmark) : 
        return bookmark.getLineNumber () 
def sortByLineNumber(bookmarks) : 
        return sorted (bookmarks, key = lineSortFn) 
fileBookmarks = defaultdict (list) 
    sortedBookmarks = [] 
    for bookmark in visibleBookmarks : 
        filePath = bookmark.getFilePath () 
        fileBookmarks [filePath].append (bookmark) 
currentFileBookmarks = fileBookmarks [currentFile] 
    sortedBookmarks = (sortedBookmarks + sortByLineNumber (currentFileBookmarks)) 
    del fileBookmarks [currentFile] 
    for bookmarkList in fileBookmarks.values () : 
        sortedBookmarkList = sortByLineNumber (bookmarkList) 
        sortedBookmarks = (sortedBookmarks + sortedBookmarkList) 
return bookmarkList 

    
    

    Fix the buggy line: return bookmarkList
assistant
#Here is Python program to fix the buggy line: return bookmarkList
.

return sortedBookmarks