python - String manipulation (replace and reverse) using a function -

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All!

Newbie here! I was trying to create a function that would allow me to change the four letters (ATCG). To be more concise, I wanted to replace 'A' with 'G' and 'C' with 'G', and vice versa.

I still have the code, but I am getting an error (expected translation of at least 1 argument, got 0).

#! / Usr / bin / python from sys import argv os.path import from import () is: str.replace ("at"); Str.replace ("C", "G"); Str.replace ("G", "C"); Str.replace ("T", "A"); Script, from_file, to_file = argv print "copy from% s to% s"% (from_file, to_file) in_file = open (from_file) indata = in_file.read () newdata = indata.translate () out_file = open (to_file, W ') out_file.write (newdata [:: - 1]) out_file.close () in_file.close ()

I tried to argue the translation function ( def Translation (Str) ) and call it with str ( newdata = indata.translate (str) ), but they do not work either.

Appreciate any help and use the guidance table: 

  import string table =   
 
 string .mocket ('ACGT', 'TGCA')

You can apply changes like this: 

  with open (to_file) - f : Content = F.read () content = content.translate (table) # swap a & lt; - & gt; T and C & lt; - & gt; G content = content [:: - 1] # Reverse string with open (to_file, 'w') as F: f.write (content)

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