from itertools import groupby
lst = ["1", "python4" "-2", "3000 TB", "-3.14", "W"]
lst = [''.join(e).strip() for sub in lst for i, e in groupby(sub, str.isdigit)]
print(lst)
'''
run:
['1', 'python', '4', '-', '2', '3000', 'TB', '-', '3', '.', '14', 'W']
'''