Beginner question : skips every second line in file when using readline()

[peter leonard]

Thanks for point out my error. This works fine now :

datafile ="C:\\Classifier\Data\\test.txt"
dataobject = open(datafile,"r")


line = dataobject.readline()
while line.strip():
    print line
    line = dataobject.readline()


I get the following desired output :

line 1

line 2

line 3

line 4

line 5



Thanks again
Peter

>From: Hans Nowak <hans at zephyrfalcon.org>
>To: peter leonard <pfleonard at hotmail.com>
>Subject: Re: Beginner question : skips every second line in file when using 
>   readline()
>Date: Mon, 20 Oct 2003 00:15:25 -0400
>
>peter leonard wrote:
>
>>Hi,
>>I having a problem with reading each line from a text file. For example, 
>>the file is a text file named 'test.txt' with the following content :
>>
>>line 1
>>line 2
>>line 3
>>line 4
>>line 5
>>
>>The following script attempts to print out each line :
>>
>>datafile ="C:\\Classifier\Data\\test.txt"
>>dataobject = open(datafile,"r")
>>
>>while dataobject.readline() !="":
>>
>>        line = dataobject.readline()
>>        print line
>
>You're calling readline() twice.  Use something like:
>
>line = dataobject.readline()
>while <line is not empty>:
>     ...do stuff...
>     line = dataobject.readline()
>
>or:
>
>for line in dataobject:
>     if <line is empty>:
>         break
>     ...do stuff...
>
>I'm writing <line is empty>, because you might want to revise 
>dataobject.readline() != "" as well.  If you read from a text file, lines 
>will end in \n, so comparing them to "" will always return false.  To check 
>for an empty line, not counting the trailing newline, use something like
>
>if not line.rstrip():
>     # line is empty
>
>HTH,
>
>--
>Hans (hans at zephyrfalcon.org)
>http://zephyrfalcon.org/
>

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