string loop

[moconno5]

Hello everyone,

I have a bit of code that I want to repeat for a string. I keep getting infinite while loops when I try it though. Any thoughts on where I am going wrong?

Thanks,
Mark

original code:

tvshow = {}
start = data.find( '>')
end = data.find( '\n', start+1)
firstname = data[start:end]
start2 = data.find ( '\n', start)
end2 = data.find( '\n', start2 + 1 )
start2 = start2 + 1
lastname = data[start2:end2]
tvshow[firstname] = lastname
 

loop code:

tvshow = {}
    start = 0
    a = 0
 
    while (data):
        if start != -1:
 
            start = data.find( '>')
            end = data.find( '\n', start+1)
            firstname = data[start:end]
            start2 = data.find ( '\n', start)
            end2 = data.find( '\n', start2 + 1 )
            start2 = start2 + 1
            lastname = data[start2:end2]
            tvshow[firstname] = lastname
            start += 1
            end += 1
            start2 += 1
            end2 += 1
        else:
            break
 

[ghostdog74]

Hello everyone,

I have a bit of code that I want to repeat for a string. I keep getting infinite while loops when I try it though. Any thoughts on where I am going wrong?

Thanks,
Mark

original code:

tvshow = {}
start = data.find( '>')
end = data.find( '\n', start+1)
firstname = data[start:end]
start2 = data.find ( '\n', start)
end2 = data.find( '\n', start2 + 1 )
start2 = start2 + 1
lastname = data[start2:end2]
tvshow[firstname] = lastname
 

loop code:

tvshow = {}
    start = 0
    a = 0
 
    while (data):
        if start != -1:
 
            start = data.find( '>')
            end = data.find( '\n', start+1)
            firstname = data[start:end]
            start2 = data.find ( '\n', start)
            end2 = data.find( '\n', start2 + 1 )
            start2 = start2 + 1
            lastname = data[start2:end2]
            tvshow[firstname] = lastname
            start += 1
            end += 1
            start2 += 1
            end2 += 1
        else:
            break
 

how about correcting your indentation first

[bvdet]

Hello everyone,

I have a bit of code that I want to repeat for a string. I keep getting infinite while loops when I try it though. Any thoughts on where I am going wrong?

Thanks,
Mark

original code:

tvshow = {}
start = data.find( '>')
end = data.find( '\n', start+1)
firstname = data[start:end]
start2 = data.find ( '\n', start)
end2 = data.find( '\n', start2 + 1 )
start2 = start2 + 1
lastname = data[start2:end2]
tvshow[firstname] = lastname
 

loop code:

tvshow = {}
    start = 0
    a = 0
 
    while (data):
        if start != -1:
 
            start = data.find( '>')
            end = data.find( '\n', start+1)
            firstname = data[start:end]
            start2 = data.find ( '\n', start)
            end2 = data.find( '\n', start2 + 1 )
            start2 = start2 + 1
            lastname = data[start2:end2]
            tvshow[firstname] = lastname
            start += 1
            end += 1
            start2 += 1
            end2 += 1
        else:
            break
 

Can you show us a sample of the string? In your code, there seems to be no way for the variable 'start' to ever be -1, so the loop would never end. You could break the string up by splitting on '\n' and extract the data by iterating on the list.

[moconno5]

Thanks for the replies.
My thinking was that when there is no data left in the string I am reading (which I read in from a file), then start would equal -1.

The sample data I am working with is:

>Musmusculuslet-7g
UGAGGUAGUAGUUUGUACAGU
>Musmusculuslet-7i
UGAGGUAGUAGUUUGUGCUGU
>MusmusculusmiR-1
UGGAAUGUAAAGAAGUAUGUA

I also practiced by using this:

>Jerry
Seinfeld
>Cosmo
Kramer

what is the problem with the indentation?

Mark

[bvdet]

I would think a solution like this would be better:

s = ">Musmusculuslet-7g\nUGAGGUAGUAGUUUGUACAGU\n>Musmusculuslet-7i\nUGAGGUAGUAGUUUGUGCUGU\n>MusmusculusmiR-1\nUGGAAUGUAAAGAAGUAUGUA"
 
dd = {}
sList = s.split()
while len(sList) > 0:
    dd[sList.pop(0)] = sList.pop(1)
 
print dd

Output:

>>> {'>Musmusculuslet-7i': 'UGAGGUAGUAGUUUGUGCUGU', '>MusmusculusmiR-1': 'UGGAAUGUAAAGAAGUAUGUA', '>Musmusculuslet-7g': 'UGAGGUAGUAGUUUGUACAGU'}
>>>

[moconno5]

Thanks! That has done the trick

Mark