my_for_loop('a','b','c'):
  API_Call1(a)
  API_Call2(b,c)

for a,b,c in product(d['a'],d['b'],d['c']):
  API_Call1(a)
  API_Call2(b,c)

from itertools import product
for a,b in product(list1,list2):
  API_Call(a,b)

for a,b in product(dictionary_of_lists['a'],dictionary_of_lists['b']):
  API_Call(a,b)

for c,b in product(dictionary_of_lists['c'],dictionary_of_lists['b']):
  API_Call(c,b)

for e,f,g,h in product(dictionary_of_lists['e'],dictionary_of_lists['f'],dictionary_of_lists['g'],dictionary_of_lists['h'],):
  API_Call1(e,f,g,h)
  API_Call2(e,h)
...