综合练习：词频统计

word='''
Well I wonder could it be
　　When I was dreaming about you baby
　　You were dreaming of me
　　Call me crazy
　　Call me blind
　　To still be suffering is stupid after all of this time
　　Did I lose my love to someone better
　　And does she love you like I do
　　I do, you know I really really do
　　Well hey
　　So much I need to say
　　Been lonely since the day
　　The day you went away
　　So sad but true
　　For me there's only you
　　Been crying since the day
　　the day you went away
　　I remember date and time
　　September twenty second
　　Sunday twenty five after nine
　　In the doorway with your case
　　No longer shouting at each other
　　There were tears on our faces
　　And we were letting go of something special
　　Something we'll never have again
　　I know, I guess I really really know
　　Why do we never know what we've got till it's gone
　　How could I carry on the day you went away
　　Cause I've been missing you so much I have to say
　　just one last dance
'''
symbol=[",",";",".","!","?","'",":","-"]
words=['t','ve','s','ll']
new_art=word
for i in range(len(symbol)):
    new_art=new_art.replace(symbol[i],'')

new_art=new_art.lower()
art_list=new_art.split()

dic = dict(zip())
for i in art_list:
    dic[i] = new_art.count(i)

for i in words:
    if(dic.get(i)!=None):
        dic.pop(i)

new_dic = sorted(dic.items(),key=lambda x:x[1],reverse = True)
for i in range(20):
    print(new_dic[i])