...
- flatten a list
flatten([1, 2, [3, [4, 5]]])
# [1, 2, 3, 4, 5]- join lists into a string
list_join(list("abc"), list("def"), sep=",")
# "a,b,c,d,e,f"- switch jupyter kernel into python or r
nb_kernel_switch(notebook_path, kernel='python')- round a number to significant digits
signif_number(1.232, 2)- concat two lists with None tolerance
concat_list([1,2,3], None)
concat_list([1,2,3], [4,5,6])