I have two lists as following
A=['a','b','c']
B=['0_txt1','0_txt2','1_txt1','1_txt2','2_txt1','2_txt2']
I should rename prefix number in B elements with corresponding list element from A, so the desired output is:
B=['a_txt1','a_txt2','b_txt1','b_txt2','c_txt1','c_txt2']
How can I do this by reading and replacing elements? Thank you!
Using list comprehension:
B = [x.replace(x.split("_")[0], A[int(x.split("_")[0])], 1) for x in B]
Or using Walrus Operator (Python 3.8+) to avoid double calculating x.split("_")[0]
B = [x.replace((p:=x.split("_")[0]), A[int(p)], 1) for x in B]
Try list comprehensions with format strings, enumerate and zip
A=['a','b','c']
B=['0_txt1','0_txt2','1_txt1','1_txt2','2_txt1','2_txt2']
C = [f"{z}_{x.split('_')[1]}" for x in B for y,z in enumerate(A) if x.split('_')[0] == str(y)]
print(C)
Here is a simple loop that will go through and see if the indices of A match the leading numbers of items in B, then replace the numbers accordingly
C = []
for string in B:
for x in A:
if string.startswith(str(A.index(x))):
C.append(string.replace(str(A.index(x)), x, 1))
