Read links and associated categories for specified articles 
        in text file seperated by a space

        Args:
            file_path (str): The path to text file with news article links
                             and category

        Returns:
            articles: Array of tuples that contains article link & cateogory
                      ex. [('IPO','www.cs.columbia.edu')]

def read_links_file(self,file_path):
        '''
        Read links and associated categories for specified articles 
        in text file seperated by a space

        Args:
            file_path (str): The path to text file with news article links
                             and category

        Returns:
            articles: Array of tuples that contains article link & cateogory
                      ex. [('IPO','www.cs.columbia.edu')]
        '''

        articles = []
        with open(file_path) as f:
            for line in f:
                line = line.strip()
                #Ignore blank lines
                if len(line) != 0:
                    link,category = line.split(' ')
                    articles.append((category.rstrip(),link.strip()))

        return articles