In Python, I am trying to write a user-defined function that takes a given DNA codon and returns a list of all the amino acids that may result from any single point mutation in the codon.

For example:

Input: ATA

All point mutated ATA's possible: ACA, AGA, AAA, TTA, GTA, CGA, ATT, ATG, ATC

Output: T, R, K, L, V, R, I, M, I

This is based on the dictionary I've built, where the key is the codon and the value is its amino acid.

geneticcode = { 'ATA':'I', 'ATC':'I', 'ATT':'I', 'ATG':'M', 'ACA':'T', 'ACC':'T', 'ACG':'T', 'ACT':'T', 'AAC':'N', 'AAT':'N', 'AAA':'K', 'AAG':'K', 'AGC':'S', 'AGT':'S', 'AGA':'R', 'AGG':'R', 'CTA':'L', 'CTC':'L', 'CTG':'L', 'CTT':'L', 'CCA':'P', 'CCC':'P', 'CCG':'P', 'CCT':'P', 'CAC':'H', 'CAT':'H', 'CAA':'Q', 'CAG':'Q', 'CGA':'R', 'CGC':'R', 'CGG':'R', 'CGT':'R', 'GTA':'V', 'GTC':'V', 'GTG':'V', 'GTT':'V', 'GCA':'A', 'GCC':'A', 'GCG':'A', 'GCT':'A', 'GAC':'D', 'GAT':'D', 'GAA':'E', 'GAG':'E', 'GGA':'G', 'GGC':'G', 'GGG':'G', 'GGT':'G', 'TCA':'S', 'TCC':'S', 'TCG':'S', 'TCT':'S', 'TTC':'F', 'TTT':'F', 'TTA':'L', 'TTG':'L', 'TAC':'Y', 'TAT':'Y', 'TGC':'C', 'TGT':'C', 'TGG':'W', }

Using this, write a function that takes one of the codons as input and outputs all the possible amino acids that could result from a point mutation in the given codon.