two_sum.py

classSolution:
deftwoSum(self, nums: List[int], target: int) ->List[int]:

# build a hashtable (by using dictionary)
# note: just store the index (because we need to return the indices)
my_dict= {}
forindexinrange( len(nums) ):
my_dict[ nums[index] ] =index
print(my_dict)

# note: my_target is the complementary number
# just check out if my_target is in the dictionary!!
forindexinrange( len(nums) ):
my_target=target-nums[index]
ifmy_targetinmy_dict:
# be careful: you may not use the same element twice!!! 
ifindex==my_dict[my_target]:
pass
else: 
return [index, my_dict[my_target] ]