How do i create a margin of error of 10% on python using 2 different sized strings

Question

I have 2 strings. The first string is a primer which contains "ATTACATGGTTTACAACTTT" The second string contains my reverse sequence in a dictionary which is: }"GGCGGAGCGCATTAAGGCCTATAGTTACTCGAGGGGCCAGGTGTAATATGTTGGGGTAGGCGGTAAAACTTGTAGACGTGAGCGTTTGCTGCATGTTAATGTTAAGGGTTCCGTGGAGAAAAGTGTAAGAAAGTGTGGTTACGAGGCTAGGTGTCAGCGGCAGTATCATAGGCCGTTGAAGTAGAAGCAATCGACGTTTTTCGGTAGAGGCAACGTTGAGTTACCGCAGAAGGAGTGTGTGGGTCAACGGGGGAGAGAGTTCAGGGTGAGGACGACCAAGAACCCTAGCTTGGGAGGTTATGTCAATGTATAGCCACTTCATAAATTCAGTGTTATTCGCAATCCGGGTGTCGAGACCATGGGTAGCGTGAGCAGGCAACCATTTGAGGTCTTGGCCGAGGTAGGGGTACTACTGCCCTAGGTGCATACAGCGAGTTCTGAGGGACGCCGTGAATTACAGTTAGAGCTCATCTACGACATCAACCAGTGGTACTTGCACATACGGTGGAGGAGAGACAAGAGGCATTTCAACATTTGGTACATTAGATCAAGAGCGTGGAGGCCATA" :"n\GGCGGAGCGCATTAAGGCCTATAGTTACTCGAGGGGCCAGGTGTAATATGTTGGGGTAGGCGGTAAAACTTGTAGACGTGAGCGTTTGCTGCATGTTAATGTTAAGGGTTCCGTGGAGAAAAGTGTAAGAAAGTGTGGTTACGAGGCTAGGTGTCAGCGGCAGTATCATAGGCCGTTGAAGTAGAAGCAATCGACGTTTTTCGGTAGAGGCAACGTTGAGTTACCGCAGAAGGAGTGTGTGGGTCAACGGGGGAGAGAGTTCAGGGTGAGGACGACCAAGAACCCTAGCTTGGGAGGTTATGTCAATGTATAGCCACTTCATAAATTCAGTGTTATTCGCAATCCGGGTGTCGAGACCATGGGTAGCGTGAGCAGGCAACCATTTGAGGTCTTGGCCGAGGTAGGGGTACTACTGCCCTAGGTGCATACAGCGAGTTCTGAGGGACGCCGTGAATTACAGTTAGAGCTCATCTACGACATCAACCAGTGGTACTTGCACATACGGTGGAGGAGAGACAAGAGGCATTTCAACATTTGGTACATTAGATCAAGAGCGTGGAGGCCATA" ,"TGGCGGTCGCATTAAGGCGTATAGTTAATCGAGAGGCCAGGTTTAGTGTGTTGGGGTAGGCGGTAAAACTTGTAGGCGTAACCGTTTGCTGCATGTTAATGTTAGCAATTCCGTGGAGAGAAGTGTAAGAAAGTTTGGTTACGGGGCTAGGTGTCAGCGGTGATATCATAGGCCGTTGAAGTACAAGAAATCGAAGTTTTTGGGTAGTAGAGGACACGTTGAGTTGCCGCAGGAGGAGTGTGTGGGTCAGGGGGGGAGAGAGTTCAGGGTAAGGACAACCAAGAACCCTAGCTTGGGAGGTTATGTCAATGTTTGGCCACTGCACAAATCTAGTGTCATTCGCATTCCGGGTGTCGAGAATTTTGATAGCGTGAGCAGTCAACCATTTCTGGTCATGGCCGAGGTAGGGCAACTACCGCACTAGGTGCACTTAGACAGTTTTGAGGGACGCCGTGAGTGACAGTTAGAGCTCATCTACGACACCAAACAGTAGTCCTTGCACAGTCACTGGAGGAGAGACAAAAGACACTTTAACATTGAGTACATTAAATTAACAGCGTGGAGACCATACGGTGATTTGACCTAAGGTAGGGTGCCTGGTGAGGCAACGTCAGCTTTTAGTGAAAGGGATTTGGTTTTGAGTCCGTTAGGGGAAACTCACAGCTCAAACATTCATTTTAAGGGCGAACTGCCTAGTAGTTTTGAAGAGGTACTAGATTCCTTAGATAACTGGGGACAAAACTCTAGCATTGGGTCAAAGTAGAGGCCTTCATTTCATAGTCATCCTTTTAGCTTTGAAACGGTGTTCTTAGGTGAACCCAGCAACAACAACCACATAGAGTCATGTTTTAAAGGCAATCGCTCTTCGAGACGGTGATGGCCTCTAAAATGTAAAGGACATCATTCTAAGCAGCTGGTCTGTCCAAATAGTCTCACTAGCTCCTACTGTTCCAATGGCA" :"n\TGGCGGTCGCATTAAGGCGTATAGTTAATCGAGAGGCCAGGTTTAGTGTGTTGGGGTAGGCGGTAAAACTTGTAGGCGTAACCGTTTGCTGCATGTTAATGTTAGCAATTCCGTGGAGAGAAGTGTAAGAAAGTTTGGTTACGGGGCTAGGTGTCAGCGGTGATATCATAGGCCGTTGAAGTACAAGAAATCGAAGTTTTTGGGTAGTAGAGGACACGTTGAGTTGCCGCAGGAGGAGTGTGTGGGTCAGGGGGGGAGAGAGTTCAGGGTAAGGACAACCAAGAACCCTAGCTTGGGAGGTTATGTCAATGTTTGGCCACTGCACAAATCTAGTGTCATTCGCATTCCGGGTGTCGAGAATTTTGATAGCGTGAGCAGTCAACCATTTCTGGTCATGGCCGAGGTAGGGCAACTACCGCACTAGGTGCACTTAGACAGTTTTGAGGGACGCCGTGAGTGACAGTTAGAGCTCATCTACGACACCAAACAGTAGTCCTTGCACAGTCACTGGAGGAGAGACAAAAGACACTTTAACATTGAGTACATTAAATTAACAGCGTGGAGACCATACGGTGATTTGACCTAAGGTAGGGTGCCTGGTGAGGCAACGTCAGCTTTTAGTGAAAGGGATTTGGTTTTGAGTCCGTTAGGGGAAACTCACAGCTCAAACATTCATTTTAAGGGCGAACTGCCTAGTAGTTTTGAAGAGGTACTAGATTCCTTAGATAACTGGGGACAAAACTCTAGCATTGGGTCAAAGTAGAGGCCTTCATTTCATAGTCATCCTTTTAGCTTTGAAACGGTGTTCTTAGGTGAACCCAGCAACAACAACCACATAGAGTCATGTTTTAAAGGCAATCGCTCTTCGAGACGGTGATGGCCTCTAAAATGTAAAGGACATCATTCTAAGCAGCTGGTCTGTCCAAATAGTCTCACTAGCTCCTACTGTTCCAATGGCA" ,"TAGACTGTATTTCTAGAACTGGTGGCGGTTACATTAAGGCGTATAGTTGCTCGAGAGGCCAGGTTTAGTGTGTTGGGGTAGACGGTAAAACTTGTAGGCGTAAGCGTTTTCTGCATGTTAATGTTAGTAATTCCGTGGAGAGGAGTGTAAGAAAGCCTGGTTACGAGGCTAAGTGTCAGCGGAGATATCATAGGCCGTTGAAGTACAAGAAATCGAAGTTTTTGGGTAGAGGACACGTTGAATTGCCGCAGAAGGAGTGTGTGGGTCAAGGGGGGAGAGAGTTCAGGGTGAGGACAACCAAGAACCCAAATTTGGGAGGTTGTGTCAATGTTTGGCCACTGCACGAATCCAGTGTTATTCGCATCCCGGGTGTCGAGAACATGTGTAGCGTGAGCAGTCGACCATTTCTGGTCTTGGCCAAGGTAAGGCAACTACCGCCCTAGGTGCACTTAGCCAGTTTTGAGGGACTCCGTCAGTGACAGTTAGAGCTCATCTACGACACCAACCAGTAGTCCTTGCACATTCGCTGGAGGAGAGACAAGAGACACTTTAACATTCAGTACATTAAATTAACAGCGTGGAGCCCATACGGTGATTAGACCTAAGGTAAGGTGCCTGGTGAGGCAACGTCAGCTTTTAGTGAAAGGGATTTGGTTTTGAGTCCGTTGGGGGAAGCTCACAGCTAAAACATTCATTTTAAGGGCGAACTGCCTAGTAGACCTGAAGAGGTACTAGATTCCTTATACAACTCGGCACAAAACTTTAACATTGGATCAAAGTAGAGACCTTCATCTCATAGTCATCCTTTTAGCTTTGAAACGGTGTTCTTAGGTGAACCCAGCAACGACAACCACATAGATTCATGTTTTAAAGGCAAACGGTCTTCGAGACGGTGGTGGCCTCTAAAGTGTAAAGGACATCATACCAAGCAGCTGGTCTGTCCAAATGGTCTCAGTAGCTCCTCCTGCTCTAAGCGCACCCTCTGAGACTCCCAAGGGTATCTCAATCTTTCTCCCAACAGAGATAAACGTTGGGTACGCATTCAAGAGAGTCCCTGAAAGAATATGGTATAAGGCTCCATGGTTTCTCTAAACCTAGGTC" :"n\TAGACTGTATTTCTAGAACTGGTGGCGGTTACATTAAGGCGTATAGTTGCTCGAGAGGCCAGGTTTAGTGTGTTGGGGTAGACGGTAAAACTTGTAGGCGTAAGCGTTTTCTGCATGTTAATGTTAGTAATTCCGTGGAGAGGAGTGTAAGAAAGCCTGGTTACGAGGCTAAGTGTCAGCGGAGATATCATAGGCCGTTGAAGTACAAGAAATCGAAGTTTTTGGGTAGAGGACACGTTGAATTGCCGCAGAAGGAGTGTGTGGGTCAAGGGGGGAGAGAGTTCAGGGTGAGGACAACCAAGAACCCAAATTTGGGAGGTTGTGTCAATGTTTGGCCACTGCACGAATCCAGTGTTATTCGCATCCCGGGTGTCGAGAACATGTGTAGCGTGAGCAGTCGACCATTTCTGGTCTTGGCCAAGGTAAGGCAACTACCGCCCTAGGTGCACTTAGCCAGTTTTGAGGGACTCCGTCAGTGACAGTTAGAGCTCATCTACGACACCAACCAGTAGTCCTTGCACATTCGCTGGAGGAGAGACAAGAGACACTTTAACATTCAGTACATTAAATTAACAGCGTGGAGCCCATACGGTGATTAGACCTAAGGTAAGGTGCCTGGTGAGGCAACGTCAGCTTTTAGTGAAAGGGATTTGGTTTTGAGTCCGTTGGGGGAAGCTCACAGCTAAAACATTCATTTTAAGGGCGAACTGCCTAGTAGACCTGAAGAGGTACTAGATTCCTTATACAACTCGGCACAAAACTTTAACATTGGATCAAAGTAGAGACCTTCATCTCATAGTCATCCTTTTAGCTTTGAAACGGTGTTCTTAGGTGAACCCAGCAACGACAACCACATAGATTCATGTTTTAAAGGCAAACGGTCTTCGAGACGGTGGTGGCCTCTAAAGTGTAAAGGACATCATACCAAGCAGCTGGTCTGTCCAAATGGTCTCAGTAGCTCCTCCTGCTCTAAGCGCACCCTCTGAGACTCCCAAGGGTATCTCAATCTTTCTCCCAACAGAGATAAACGTTGGGTACGCATTCAAGAGAGTCCCTGAAAGAATATGGTATAAGGCTCCATGGTTTCTCTAAACCTAGGTC"{

I want to run my primer though this sequence and add up to a 10% margin of error. What code can be used to do this. Thanks for any help it would mean a lot :)