String Comparison Error

Question

I've problem in the comparison line line == a[1] because it doesn't go to this loop. I tried testing the output and found that there is value 'a' in the file already. Below is my code.

a = "djsajdlasak"
f = open('users.txt','r+')
k = 0
for line in f:
    print line
    if line == a:
        k = 1
if k == 0:
    f.write(a + '\n')
f.close()

Please explain exactly (1) what you're trying to do (2) what's the expected output (3) what's the current output or error messsage — shx2, Oct 03 '14 at 05:39

score 0 · Accepted Answer · edited May 23 '17 at 12:27

0

for line in f yields lines together with line terminators, so you need to strip them, see to read line from file in python without getting "\n" appended at the end

edited May 23 '17 at 12:27

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answered Oct 03 '14 at 05:39

wRAR

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score 0 · Answer 2 · answered Oct 03 '14 at 05:40

You need to strip out the newline/line terminator from the lines you are reading from the file. You can use str.strip, to achieve what you would would desire.

either change the line for line in f: for line in(elem.strip() for elem in f): or add an extra line following your for statement

for line in f:
    line = line.strip()
    print line
    if line == a:
        k = 1

String Comparison Error

2 Answers2