Porter Stemmer 算法无法逐行处理句子
Porter Stemmer algorithm not working through the sentences row by row
我正在尝试通过 Porter Stemmer 算法 运行 句子，但是我收到错误：AttributeError: 'list' object has no attribute 'lower'。谁能帮忙，因为我无法确定问题所在：
这是我的输入：
Sentiment Review
Neg The new Ford Focus came highly recommended to me when I was looking to buy my first new car I researched its history and found that it received great reviews for comfort and safety during its European release Test driving the car I found it to be comfortable well equipped and stylish I have now driven the car for for 6 months and have put only 5000 miles on it While I have been happy with the overall performance of the car I have been sorely disappointed with the workmanship involved Realizing that new models are notorious for having manufacturing bugs I felt somewhat reassured that these would have been worked out from 1998 1999 during the first European release I was wrong My car has been in the repair shop a total of five times for manufacturers defects including a flooded passenger compartment repaired twice to date faulty master clutch cylinder misaligned striker plate on seat back latch broken break switch and cruise control While I really love my car I would hesitate to recommend it to any but my worst enemies Time will tell if the problems my Focus has had are unique or are related to intrinsic design flaws
Neg We bought the Focus ZTS sedan because my wife needed an economical car to haul the grandkids around with We traded in a 94 Explorer with a 5 speed just before the Firestone tire fiasco became public My wife loves driving the car Although it is a bit small for me 6 1 290lbs it is OK The car handles great and with the Zetec engine it has adequate performance although I wouldnt want any less go than its got Now for the problems the main one of which is because I do my own oil changes A particular sore point for me with most cars is that the manufacturers dont make it easy to change the oil and filter without creating a mess This new Focus is particularly bad First the owners manual indicates a Motocraft FL2005 filter The car had an FL801 on it which some ham fisted factory idiot had torqued to about a million foot pounds I had to use some very large pliers and turn the filter almost 3 4 turn before it was loose enough to move by hand Poor quality control The filter happens to be mounted in a horizontal position and is almost flush with the side of the engine When I finally got it loose oil ran down the side of the engine onto the drive axle onto the frame down my arm and all over the driveway Very bad design On other cars I have been able to use a cut off soda bottle placed over the filter to catch the drips On the Focus it wont work The hood on this car is aluminum It bends very easy mine already has a dent in it and I didnt have an accident A minor problem is the power windows They wont operate with the key in the accessory position Tilt wheel also difficult to operate Bottom line only 3 000 miles on this car but its going to get traded off as soon as possible for a vehicle with a little more substance and which is easier to maintain ive owned 9 Fords since 1986 still have 3 If all the newer Fords are made this way the Focus may be the last Ford product I buy
Neg Recently I had the need to rent a car I picked the Ford Focus I was amazed with this car I liked it better than my own more expensive 1999 Toyota Corolla LE The steering wheel is not only height adjustable but also telescopes something you do not normally find on such a reasonably priced car The drivers seat also adjusted forward and back and in height nice feature for someone tall like myself The front seats were roomy and comfortable and the back seat had I think the most leg room I HAVE EVER SEEN in a compact car The stereo sounded good considering it was stock and the face of the radio has an upward tilt to it so that it is driver friendly All the bells and whistles were located within easy reach and the air worked well In addition to having a roomy trunk there are 60 40 split rear seats Child safety seat anchors and shoulder harness seat belts for 5 passengers I rented the 4 door sedan but there are 3 body styles The 4 door sedan 4 door wagon and a sporty little hatch back I have read the safety ratings for the hatch back and from what I recall it got 5 stars This car is definately on my list of cars to consider purchasing in the near future you should take a look at it too
Pos Cruising In My Big T I have had my 91 Thunderbird for 4 years now bought it way back in my freshman year and it has served me well throughout college I am a horrible Northern driver and brutal on my vehicles but this piece of Ford craftsmanship refuses to bail out on me Its a rough and tumble vehicle that remains an incredible deal for the price especially when bought used from a reputable dealer The Advantages 1 Seat Space These are big seats people with the kind of legroom that only those pretentious you know whats in first class usually get their hands on And that spaciousness isnt just about spoiling the people up front either it extends to the back seat as well which means that everyone feels just a little bit more comfortable and relaxed when you get to wherever you re going And not only are the seats big but the generous amount of padding in each makes for an especially comfortable ride 2 Appearance ive gt to admit it to you I just love the look of the Thunderbird though it is an acquired taste to be sure I can best describe the style as Italian sleek in a chunky way and available in colors like burgundy that make it look like a cross between a hit mobile and a hearse 3 Smooth Ride Riding in my Thunderbird has always seemed quite smooth to me especially when you consider how low to the ground it is Why so low That kind of positioning allows the Thunderbird to provide the rider with great control as your feel for the road is significantly enhanced In the same arena as the ride is the ease of use of the console which for me equals smoothness and ease The Thunderbirds radio and air console is incredibly well designed with everything within reach and intuitively organized Seem trivial to you Try changing the station at 75 miles an hour and see how important knob placement is 4 Trunk This is a important feature for me as I seem to move every 3 6 months The trunk on the Thunderbird is big enough for all of your luggage not to mention the corpse of Vinnie The Chin from a rival family My Defense I have read another review of this vehicle that criticizes the brake quality and I have to vehemently disagree with it I ride my brakes hard and I have never had a lockup or other incident The brakes do tend to squeek a bit but the noise is no indication of a performance issue The Final Verdict The bottom line is that the Thunderbird is a comfortable and well designed car at a reasonable price As long as you like burgundy vehicles and live in an area thats at least 30 Italian the Thunderbird is a great option
Pos I arrived in the states from Australia at the end of March 1999 to stay there for a year and come home at the end of March 2000 I stayed with friends in South Carolina who is a Ford man as I have always owned GM or Chevs they lent me a 1979 red corvette until I bought myself a car so after 3 months I did buy a 1985 Z28 Camaro 350 to fix up and use for the 9 months after looking at it I thought this was a bad idea so looked in the local paper and found a red 1991 V8 Thunderbird with 114 000 miles on it for 3000 After taking it for a test drive offered the lady 2800 and drove it home it had a slight water leak from the water pump so while replacing it I installed a set of under drive pulleys which I could notice the power increase the first time I drove it put a K amp N air cleaner in as well I had a friend come over from Australia so we drove from Greenville SC across to Sequin TX did about 3000 miles in that trip we took the long way and had no trouble at all and got 27 MPG sitting on 80 MPH had a radar detector it has a highway ratio in it 2 75 My brother came over from Australia so we went from Greenville SC down to Daytona Beach and back then drove across America to California which we did about 4600 miles trouble free When we left Williams AZ the car was buried under snow as we had a cold snap and snow dig the snow away and turn the key starting the engine at once and never missing a beat The car came with the premium sound system but the radio cassette was playing up so replaced it with a Pioneer radio CD I went to the wreckers and bought an electric motor seat assembly for the right hand side so when converting to RHD will have an electric adjustment Also bought a sports instrument cluster and centre handbrake assy out of a super coupe These cars were never made for export or for Right Hand Drive so have to get all the parts needed now for conversion I did 18 000 miles in 9 months without the car stopping or letting me down I gave the car 4 oil changes added fuel octane booster with every tank of gas it has the factory 15 alloy wheels with Michelin tyres I found the car very easy to drive and steer but did experience brake shudder which appears to be a common problem due to thin brake rotors I added a rear spoiler and had the windows tinted which makes the car look sporty as in Australia the only 2 door cars are mainly Jap imports so in the end I shipped the car back to Australia where I have to convert it over to Right Hand Drive for our road rules this cars owes me 10 000 Australia 5200 US landed back at my house in Australia which when converted to RHD they sell from 35 000 to 40 000 18 000 to 21 000 US BEST CAR I HAVE EVER OWNED
这是我为此使用的代码：
import pandas as pd
df = pd.read_csv ('test_data.csv')
df.head()
import nltk
from nltk.tokenize import word_tokenize
from nltk.stem import PorterStemmer
ps = PorterStemmer()
def porterStemmer(text):
for line in text:
w = word_tokenize(line)
words = []
for x in w:
words.append(ps.stem(x))
return words
word_tokenize 函数 returns 标记列表。因此，您需要第二个 for 循环或列表理解：
words = [ps.stem(x) for x in w]
使用 for 循环：
w = word_tokenize(line)
words = []
for x in w:
words.append(ps.stem(x))
我正在尝试通过 Porter Stemmer 算法 运行 句子，但是我收到错误：AttributeError: 'list' object has no attribute 'lower'。谁能帮忙，因为我无法确定问题所在：
这是我的输入：
Sentiment Review
Neg The new Ford Focus came highly recommended to me when I was looking to buy my first new car I researched its history and found that it received great reviews for comfort and safety during its European release Test driving the car I found it to be comfortable well equipped and stylish I have now driven the car for for 6 months and have put only 5000 miles on it While I have been happy with the overall performance of the car I have been sorely disappointed with the workmanship involved Realizing that new models are notorious for having manufacturing bugs I felt somewhat reassured that these would have been worked out from 1998 1999 during the first European release I was wrong My car has been in the repair shop a total of five times for manufacturers defects including a flooded passenger compartment repaired twice to date faulty master clutch cylinder misaligned striker plate on seat back latch broken break switch and cruise control While I really love my car I would hesitate to recommend it to any but my worst enemies Time will tell if the problems my Focus has had are unique or are related to intrinsic design flaws
Neg We bought the Focus ZTS sedan because my wife needed an economical car to haul the grandkids around with We traded in a 94 Explorer with a 5 speed just before the Firestone tire fiasco became public My wife loves driving the car Although it is a bit small for me 6 1 290lbs it is OK The car handles great and with the Zetec engine it has adequate performance although I wouldnt want any less go than its got Now for the problems the main one of which is because I do my own oil changes A particular sore point for me with most cars is that the manufacturers dont make it easy to change the oil and filter without creating a mess This new Focus is particularly bad First the owners manual indicates a Motocraft FL2005 filter The car had an FL801 on it which some ham fisted factory idiot had torqued to about a million foot pounds I had to use some very large pliers and turn the filter almost 3 4 turn before it was loose enough to move by hand Poor quality control The filter happens to be mounted in a horizontal position and is almost flush with the side of the engine When I finally got it loose oil ran down the side of the engine onto the drive axle onto the frame down my arm and all over the driveway Very bad design On other cars I have been able to use a cut off soda bottle placed over the filter to catch the drips On the Focus it wont work The hood on this car is aluminum It bends very easy mine already has a dent in it and I didnt have an accident A minor problem is the power windows They wont operate with the key in the accessory position Tilt wheel also difficult to operate Bottom line only 3 000 miles on this car but its going to get traded off as soon as possible for a vehicle with a little more substance and which is easier to maintain ive owned 9 Fords since 1986 still have 3 If all the newer Fords are made this way the Focus may be the last Ford product I buy
Neg Recently I had the need to rent a car I picked the Ford Focus I was amazed with this car I liked it better than my own more expensive 1999 Toyota Corolla LE The steering wheel is not only height adjustable but also telescopes something you do not normally find on such a reasonably priced car The drivers seat also adjusted forward and back and in height nice feature for someone tall like myself The front seats were roomy and comfortable and the back seat had I think the most leg room I HAVE EVER SEEN in a compact car The stereo sounded good considering it was stock and the face of the radio has an upward tilt to it so that it is driver friendly All the bells and whistles were located within easy reach and the air worked well In addition to having a roomy trunk there are 60 40 split rear seats Child safety seat anchors and shoulder harness seat belts for 5 passengers I rented the 4 door sedan but there are 3 body styles The 4 door sedan 4 door wagon and a sporty little hatch back I have read the safety ratings for the hatch back and from what I recall it got 5 stars This car is definately on my list of cars to consider purchasing in the near future you should take a look at it too
Pos Cruising In My Big T I have had my 91 Thunderbird for 4 years now bought it way back in my freshman year and it has served me well throughout college I am a horrible Northern driver and brutal on my vehicles but this piece of Ford craftsmanship refuses to bail out on me Its a rough and tumble vehicle that remains an incredible deal for the price especially when bought used from a reputable dealer The Advantages 1 Seat Space These are big seats people with the kind of legroom that only those pretentious you know whats in first class usually get their hands on And that spaciousness isnt just about spoiling the people up front either it extends to the back seat as well which means that everyone feels just a little bit more comfortable and relaxed when you get to wherever you re going And not only are the seats big but the generous amount of padding in each makes for an especially comfortable ride 2 Appearance ive gt to admit it to you I just love the look of the Thunderbird though it is an acquired taste to be sure I can best describe the style as Italian sleek in a chunky way and available in colors like burgundy that make it look like a cross between a hit mobile and a hearse 3 Smooth Ride Riding in my Thunderbird has always seemed quite smooth to me especially when you consider how low to the ground it is Why so low That kind of positioning allows the Thunderbird to provide the rider with great control as your feel for the road is significantly enhanced In the same arena as the ride is the ease of use of the console which for me equals smoothness and ease The Thunderbirds radio and air console is incredibly well designed with everything within reach and intuitively organized Seem trivial to you Try changing the station at 75 miles an hour and see how important knob placement is 4 Trunk This is a important feature for me as I seem to move every 3 6 months The trunk on the Thunderbird is big enough for all of your luggage not to mention the corpse of Vinnie The Chin from a rival family My Defense I have read another review of this vehicle that criticizes the brake quality and I have to vehemently disagree with it I ride my brakes hard and I have never had a lockup or other incident The brakes do tend to squeek a bit but the noise is no indication of a performance issue The Final Verdict The bottom line is that the Thunderbird is a comfortable and well designed car at a reasonable price As long as you like burgundy vehicles and live in an area thats at least 30 Italian the Thunderbird is a great option
Pos I arrived in the states from Australia at the end of March 1999 to stay there for a year and come home at the end of March 2000 I stayed with friends in South Carolina who is a Ford man as I have always owned GM or Chevs they lent me a 1979 red corvette until I bought myself a car so after 3 months I did buy a 1985 Z28 Camaro 350 to fix up and use for the 9 months after looking at it I thought this was a bad idea so looked in the local paper and found a red 1991 V8 Thunderbird with 114 000 miles on it for 3000 After taking it for a test drive offered the lady 2800 and drove it home it had a slight water leak from the water pump so while replacing it I installed a set of under drive pulleys which I could notice the power increase the first time I drove it put a K amp N air cleaner in as well I had a friend come over from Australia so we drove from Greenville SC across to Sequin TX did about 3000 miles in that trip we took the long way and had no trouble at all and got 27 MPG sitting on 80 MPH had a radar detector it has a highway ratio in it 2 75 My brother came over from Australia so we went from Greenville SC down to Daytona Beach and back then drove across America to California which we did about 4600 miles trouble free When we left Williams AZ the car was buried under snow as we had a cold snap and snow dig the snow away and turn the key starting the engine at once and never missing a beat The car came with the premium sound system but the radio cassette was playing up so replaced it with a Pioneer radio CD I went to the wreckers and bought an electric motor seat assembly for the right hand side so when converting to RHD will have an electric adjustment Also bought a sports instrument cluster and centre handbrake assy out of a super coupe These cars were never made for export or for Right Hand Drive so have to get all the parts needed now for conversion I did 18 000 miles in 9 months without the car stopping or letting me down I gave the car 4 oil changes added fuel octane booster with every tank of gas it has the factory 15 alloy wheels with Michelin tyres I found the car very easy to drive and steer but did experience brake shudder which appears to be a common problem due to thin brake rotors I added a rear spoiler and had the windows tinted which makes the car look sporty as in Australia the only 2 door cars are mainly Jap imports so in the end I shipped the car back to Australia where I have to convert it over to Right Hand Drive for our road rules this cars owes me 10 000 Australia 5200 US landed back at my house in Australia which when converted to RHD they sell from 35 000 to 40 000 18 000 to 21 000 US BEST CAR I HAVE EVER OWNED
这是我为此使用的代码：
import pandas as pd
df = pd.read_csv ('test_data.csv')
df.head()
import nltk
from nltk.tokenize import word_tokenize
from nltk.stem import PorterStemmer
ps = PorterStemmer()
def porterStemmer(text):
for line in text:
w = word_tokenize(line)
words = []
for x in w:
words.append(ps.stem(x))
return words
word_tokenize 函数 returns 标记列表。因此，您需要第二个 for 循环或列表理解：
words = [ps.stem(x) for x in w]
使用 for 循环：
w = word_tokenize(line)
words = []
for x in w:
words.append(ps.stem(x))