Convert ADN en python

Bonjour,

Comment   Résoudre cette erreure svp

#Extraire le complément de la chaîne d'ADN 
def complementary_dna ( dna_str ) : 
complement = { ' A ' : ' T ' , ' T ' : ' A ' , ' G ' : ' C ' , ' c ' : ' G ' } 
dna_complement = [ ]
for base in dna_str :
 dna_complement.append ( complement [ base ] )
return ' '.join (dna_complement)

def encrypt ( file_path , Mk ) : 
blue , green , red , img1 = decompose_matrix ( file_path )
 blue_e , green_e , red_e = dna_encode ( blue , green , red ) 
blue_s , green_s , red_s = complementary_dna ( blue_e , green_e , red_e )
return img1

Error:
  File " c : \ Users \ acer \ projetdna \ encrypt.py " , line 335 , in encrypt 
blue_s , green_s , red_s = complementary_dna ( blue_e , green_e , red_e )
  TypeError: complement_dna() takes 1 positional argument but 3 were given 

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