Error with usage of int() in Python (QPython)

Question

I have a pretty strange problem with int() Sometimes, even if it's really just numbers, I'm getting the error

"[...] In line 2: Invalid literal with Base 10: '' "

But the value is just a number (0) It's so strange... The following code causes this error:

count = open('count.dat', 'r')
cint = int(count.read)
cint = cint + 1
count.close()
del(count)
countw = open('count.dat', 'w+')
countw.write = str(cint)
countw.close()
del(countw)

PS: I'm a newbie

`""` seems like a emtpy string to me, I have a hard time converting that to a valid integer. Perhaps you got an empty string when the file is completely read? or is it a space `" "` either way, it's hard to convert text to a number when there are no (hex) numbers in it. — hetepeperfan, Mar 12 '18 at 18:59
`int(count.read)` converts a member function of a file instance function to int... perhaps you mean `int(count.read())` instead — hetepeperfan, Mar 12 '18 at 19:05
In correct usage (when the value count is set correctly) count.read represents everything in the given file — M-Try, Mar 12 '18 at 19:07
Sorry, my bad. I tested int(count.read()) now, and it's still giving me this error — M-Try, Mar 12 '18 at 19:09
Quick lil' update: the error persists, even after changing int(count.read) to int(count.read()) I just don't get it. — M-Try, Mar 12 '18 at 19:30

Sunimal S.K Malkakulage · Answer 1 · 2018-03-12T19:43:45.697

1

I thnk your code cint = int(count.read) , countw.write = str(cint) these lines should change

count = open('count.dat', 'r')
cint = int(count.read()) # as this 
cint = cint + 1
count.close()
del(count)

countw = open('count.dat', 'w')
countw.write(str(cint)) #as this
countw.close()
del(countw)

then it will work fine

before run the code

After running

if you count.dat file is blank obviously it will give the error int() with base 10: ''

edited Mar 12 '18 at 19:43

answered Mar 12 '18 at 19:25

Sunimal S.K Malkakulage

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for the initial run you setting the dat file 0 right? – Sunimal S.K Malkakulage Mar 12 '18 at 19:37
before I ran this script, I ran another script which replaces everything in count.dat by 0 – M-Try Mar 12 '18 at 19:40
As I mentioned before, another script, which ran before sets count.dat to 0 but even if I run your improved script after it, I'm still experiencing this error – M-Try Mar 12 '18 at 19:49
if you using any IDE or some thing or if you can check before running the above script the value in the count.dat exactly 0 or " " then you can figur out the issue I think to check whether previous script making the count.dat 0 – Sunimal S.K Malkakulage Mar 12 '18 at 20:12
Actually, the count.dat was blank, when I checked it. That's confusing, because in the 1. Script, I clearly wrote "0" (without the ") in the count.dat file. – M-Try Mar 16 '18 at 17:06
then you have to check that script why its not setting it properly – Sunimal S.K Malkakulage Mar 16 '18 at 17:59
I checked the script 3 times, and I'm sure it should work. But it doesn't – M-Try Mar 17 '18 at 07:48
Is this issue Fixed? – Sunimal S.K Malkakulage Apr 01 '18 at 09:41

Error with usage of int() in Python (QPython)

1 Answers1