I'm using readlines method from python to get list of all data lines. Now I wan't to access some index from that list:
file = open('article.txt', 'r')
data = file.readlines()
print data.index(1)
Error: data isn't a list
What's wrong?
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Re-read the error message: It's not "data isn't a list" but rather "x not in list"Tim Pietzcker– Tim Pietzcker2010-12-06 16:54:52 +00:00Commented Dec 6, 2010 at 16:54
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1BTW, cool that you're currently at exactly 1,337 karma. I dare not upvote your question :)Tim Pietzcker– Tim Pietzcker2010-12-06 16:57:56 +00:00Commented Dec 6, 2010 at 16:57
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@tim-pietzcker Sorry, I just wasn't near my computer. I always mark questions which help me.Max Frai– Max Frai2010-12-06 17:24:13 +00:00Commented Dec 6, 2010 at 17:24
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2 Answers
I think you mean (if your goal is to print the second element of the list):
print data[1]
data.index(value) returns the list position of value:
>>> data = ["a","b","c"]
>>> data[1] # Which is the second element of data?
b
>>> data.index("a") # Which is the position of the element "a"?
0
>>> data.index("d") # Which is the position of the element "d"? --> not in list!
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: list.index(x): x not in list
1 Comment
GreenMatt
And if the objective is to print the first line in the input file, use
print data[0]Sounds like you mean print data[1] not print data.index(1). See the tutorial
