Python text processing: AttributeError: 'list' object has no attribute 'lower'

Question

I am new to Python and to Stackoverflow(please be gentle) and am trying to learn how to do a sentiment analysis. I am using a combination of code I found in a tutorial and here: Python - AttributeError: 'list' object has no attribute However, I keep getting ``` Traceback (most recent call last): File "C:/Python27/training", line 111, in <module> processedTestTweet = processTweet(row) File "C:/Python27/training", line 19, in processTweet tweet = tweet.lower() AttributeError: 'list' object has no attribute 'lower'` ``` This is my code: ``` import csv #import regex import re import pprint import nltk.classify #start replaceTwoOrMore def replaceTwoOrMore(s): #look for 2 or more repetitions of character pattern = re.compile(r"(.)\1{1,}", re.DOTALL) return pattern.sub(r"\1\1", s) # process the tweets def processTweet(tweet): #Convert to lower case tweet = tweet.lower() #Convert www.* or https?://* to URL tweet = re.sub('((www\.[\s]+)|(https?://[^\s]+))','URL',tweet) #Convert @username to AT…

Accepted Answer

The result from the csv reader is a list, `lower` only works on strings. Presumably it is a list of string, so there are two options. Either you can call `lower` on each element, or turn the list into a string and then call `lower` on it.

```
# the first approach
[item.lower() for item in tweet]

# the second approach
' '.join(tweet).lower()
```

But more reasonably (hard to tell without more information) you only actually want one item out of your list. Something along the lines of:

```
for row in reader:
    processedTestTweet = processTweet(row[0]) # Again, can't know if this is actually correct without seeing the file
```

Also, guessing that you aren't using the csv reader quite like you think you are, because right now you are training a naive bayes classifier on a single example every time and then having it predict the one example it was trained on. Maybe explain what you're trying to do?

Python text processing: AttributeError: 'list' object has no attribute 'lower'

Solution

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