Closed:basic problem on loop python

Question

[elisheva]

Hello everyone I have a problem with my code on python. The goal is to write a text file of the name of organisms which has cdna file. The problem is that I have a file that looks like this:

./anas_platyrhynchos/pep:
-rwxrwxr-x    1 ftp      ftp      10561439 May 07 11:02 Anas_platyrhynchos.BGI_duck_1.0.pep.abinitio.fa.gz
-rwxrwxr-x    1 ftp      ftp       5762174 May 07 10:34 Anas_platyrhynchos.BGI_duck_1.0.pep.all.fa.gz
-rwxrwxr-x    1 ftp      ftp           140 May 09 16:17 CHECKSUMS
-rwxrwxr-x    1 ftp      ftp          3065 May 07 11:02 README

./ancestral_alleles:
-rwxrwxr-x    1 ftp      ftp      590904827 May 16 09:58 callithrix_jacchus_ancestor_C_jacchus3.2.1_e86.tar.gz
-rwxrwxr-x    1 ftp      ftp      848229938 May 16 09:59 chlorocebus_sabaeus_ancestor_ChlSab1.1_e86.tar.gz
-rwxrwxr-x    1 ftp      ftp      767402743 May 16 09:59 gorilla_gorilla_ancestor_gorGor3.1_e86.tar.gz
-rwxrwxr-x    1 ftp      ftp      845762805 May 16 09:58 homo_sapiens_ancestor_GRCh38_e86.tar.gz
-rwxrwxr-x    1 ftp      ftp      791833177 May 16 09:59 macaca_mulatta_ancestor_Mmul_8.0.1_e86.tar.gz
-rwxrwxr-x    1 ftp      ftp      812588425 May 16 09:59 pan_troglodytes_ancestor_CHIMP2.1.4_e86.tar.gz
-rwxrwxr-x    1 ftp      ftp      804459736 May 16 09:59 papio_anubis_ancestor_PapAnu2.0_e86.tar.gz
-rwxrwxr-x    1 ftp      ftp      799305351 May 16 09:59 pongo_abelii_ancestor_PPYG2_e86.tar.gz

./anolis_carolinensis:
drwxrwxr-x    2 ftp      ftp          4096 May 09 16:17 cdna
drwxrwxr-x    2 ftp      ftp          4096 May 09 16:17 cds
drwxrwxr-x    2 ftp      ftp          8192 May 09 16:17 dna
drwxrwxr-x    2 ftp      ftp          4096 May 09 16:17 dna_index
drwxrwxr-x    2 ftp      ftp          4096 May 09 16:17 ncrna
drwxrwxr-x    2 ftp      ftp          4096 May 09 16:17 pep

./anolis_carolinensis/cdna:
-rwxrwxr-x    1 ftp      ftp      43505585 May 07 22:42 Anolis_carolinensis.AnoCar2.0.cdna.abinitio.fa.gz
-rwxrwxr-x    1 ftp      ftp      16313984 May 07 22:21 Anolis_carolinensis.AnoCar2.0.cdna.all.fa.gz
-rwxrwxr-x    1 ftp      ftp           138 May 09 16:17 CHECKSUMS
-rwxrwxr-x    1 ftp      ftp          3153 May 07 22:42 README

./anolis_carolinensis/cds:
-rwxrwxr-x    1 ftp      ftp      10413036 May 07 22:21 Anolis_carolinensis.AnoCar2.0.cds.all.fa.gz
-rwxrwxr-x    1 ftp      ftp            75 May 09 16:17 CHECKSUMS
-rwxrwxr-x    1 ftp      ftp          2501 May 07 22:42 README

So for this example I have to write only anolis_carolinensis.
Here is my code so far:

def separate(s):
    """This function gets a text file withe some data and "sifts" only the
        require information"""

    index = 0 #Initialize the index of the text.
    while(True):        
        if not s: #If the file is over.
            break
        current =  s.find("cdna.all.fa.gz",index) #The "location of that particular string"
        if current > -1: #If indeed the "cdna..." was found           
            root = s.rfind("./",0,current) #Goes back to find the organism.
            organ.write(s[root+2: s.find(":",root)]+"/\n") #Writes the organisms into a text file.
            index = current #Updates the index to the current position.
            s = s[index:] #Promotes the text
        else: #If there is no more "cdna...".
            break

data =  open('Content.txt','r') #The file of all the data.
organ = open ('ftp.txt','w') #A file for the "ftp"
s = data.read() 
separate(s)
data.close()
organ.close()

The problem is that it doesn't write all the organisms - it skips some of them...
I guess it's because of the index, I'v tried to change it but not successfully.

Thanks!!