Def one_ctuuers(strand, names, sequences): \"\"\"(str, list of str, list of str)

Question

Def one_ctuuers(strand, names, sequences): """(str, list of str, list of str) rightarrow list of (str, int) tuples The parameters are the same as for match_enzymes. Return a list of tuples representing the 1-cutters for the DNA strand that is the first parameter. The first item of each tuple is the name of a restriction enzyme and the second item is the index (in the DNA strand) of the one restriction site that the enzyme cuts. >>>one_ctuuers ("ATTGCGAGCT", ["Alul", "Kpnl"], ["AGCT", "GGTACC"]) [("Alul", [6])) >>>one_ctuuers ("CCCGGCCAGCTGGCC", ["Haelll", "Alul"], ["GGCC", "AGCT")) [("Haelll", [3]), ("Alul", [7])] >>>one_Ctuuers ("GTCGACTTATCGA", ["Taql' "Kpnl"], ["TCGA", "GGTACC")) [("TaqI", [1])]

Explanation / Answer

def one_ctuuers( strand, names, sequences ):

p= []

for i in range( len( names ) ):

findindexes = binding( strand, sequences[ i ] )

p += [ ( names[ i ], findindexes ) ]

return p

def binding(stringA, stringB ):

checkindexes = []

i = 0

while i < len( stringA ):

# Firstly we will compare the string A cut from the index i to whatever size string B is

# now if the strings are equal we will be adding the index to the list and increment the value of i depending on the length of stringB

if stringA[ i : i + len( stringB ) ] == stringB:

checkindexes += [ i ]

i += len( stringB ) - 1

i += 1 # now we will go to next index

return checkindexes

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