import cppy.cp_util as util
import operator

# 工具函数
def extract_words(path_to_file):    
    return util.extract_file_words(path_to_file)

def frequencies(word_list):
    return util.get_frequencies(word_list)

s = ' lambda word_freq: '+ \
    ' sorted(word_freq.items(), key=operator.itemgetter(1), reverse=True) '
exec( 'mysort = ' + s )  # s 可以是读文件，也可以网络发过来的代码

if __name__ == '__main__':   
    word_freq = frequencies(extract_words( util.testfilepath )) 
    word_freq = locals()['mysort'](word_freq)
    util.print_word_freqs(word_freq)