[Python] How to transcribe a list of DNA sequences to RNA in Python

I am trying to return a list of RNA sequences transcribed from DNA sequences. Ideally it should look like:

DNA_seq = ['AGGTC','TTGACT','ATGGCA']
RNA_seq = ['UCCAG','AACUGA','UACCGU']


From my understanding, a dictionary should help store the key-value pairs for each nucleotide and its corresponding base pair. Here is what I have so far:

def RNA(DNA_strand):
mapping = {'G':'C', 'C':'G', 'T':'A', 'A':'U'}
rna_strand = ''
for char in DNA_strand:
rna_strand += mapping[char]
return rna_strand

RNA_seq = []
for x in DNA_seq:
RNA_seq.append(RNA(x))


I kind of pieced this together, but I still does not seem to be effective enough.

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