Hi All, 

I am trying to concatenate several hundred files based on their filename..  
Filenames are like this:

Q1.HOMOblast.fasta  
Q1.mus.blast.fasta  
Q1.query.fasta  
Q2.HOMOblast.fasta  
Q2.mus.blast.fasta  
Q2.query.fasta
...
Q1223.HOMOblast.fasta  
Q1223.mus.blast.fasta  
Q1223.query.fasta

All the Q1's should be concatenated together in a single file = 
Q1.concat.fasta.. Q2's go together, Q3's and so on...

I envision something like

for file in os.listdir("/home/matthew/Desktop/pero.ngs/fasta/final/"):
        if file.startswith("Q%i"):
           concatenate...

But I can't figure out how to iterate this process over Q-numbers 1-1223

Any help appreciate.




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