python3.4.3下逐行讀入txt文本并去重的方法

#!/bin/python3
original_list1=[" "]
original_list2=[" "]
original_list3=[" "]
original_list4=[" "]
newlist1=[" "]
newlist2=[" "]
newlist3=[" "]
newlist4=[" "]
newtxt1=""
newtxt2=""
newtxt3=""
newtxt4=""
#first way to readline
f = open("duplicate_txt.txt","r+") # 返回一個(gè)文件對(duì)象 
line = f.readline() # 調(diào)用文件的 readline()方法 
while line: 
 original_list1.append(line) 
 line = f.readline() 
f.close() 
#use "set()" remove duplicate str in the list
# in this way,list will sort randomly
newlist1 = list(set(original_list1))
#newlist1 = {}.fromkeys(original_list1).keys() #faster 
#rebuild a new txt 
newtxt1="".join(newlist1)
f1 = open("noduplicate1.txt","w")
f1.write(newtxt1)
f1.close()
###################################################################
#second way to readline
for line in open("duplicate_txt.txt","r+"): 
 original_list2.append(line)
newlist2 = list(set(original_list2))
newlist2.sort(key=original_list2.index) #sort
#newlist2 = sorted(set(original_list2),key=l1.index) #other way
newtxt2="".join(newlist2)
f2 = open("noduplicate2.txt","w")
f2.write(newtxt2)
f2.close()
###################################################################
#third way to readline
f3 = open("duplicate_txt.txt","r") 
original_list3 = f3.readlines() #讀取全部?jī)?nèi)容 ，并以列表方式返回 
for i in original_list3: #遍歷去重
 if not i in newlist3:
 newlist3.append(i)
newtxt3="".join(newlist3)
f4 = open("noduplicate3.txt","w")
f4.write(newtxt3)
f4.close()
###################################################################
#fourth way
f5 = open('duplicate_txt.txt',"r+") 
try: 
 original_list4 = f5.readlines() 
 [newlist4.append(i) for i in original_list4 if not i in newlist4]
 newtxt4="".join(newlist4)
 f6 = open("noduplicate4.txt","w")
 f6.write(newtxt4)
 f6.close()
finally: 
 f5.close()

f = open("test.txt"，"w")
f.write(u"你好")

f = open("test.txt"，"w")
text=u"你好"
text=text.encode(encoding='utf-8')
f.write(text)

f = open("test.txt"，"w")
try:
 text=u"你好"
 text=text.encode(encoding='utf-8')
 f.write(text)
except: IOError as e:
 print("oops,%s"%e.args[0])
finally:
 f.close()

with open("test.txt"，"w") as f:
 text=u"你好"
 f.write(text.encode(encoding='utf-8'))

from io import open
with open("test.txt"，"w",encoding='utf-8') as f:
 f.write(u"你好")