Multiply each integer of a list by the integer of another list in Python

Question

For a simulation scenario I'm generating 2 random lists.

For example:

my_list_1 = [17, 4, 22, 10, 18, 19, 23, 12]

my_list_2 = [82]

Just double checked the type of my_list_2 and the result is <class 'list'>

I need to create a new_list_3 with the result of 82*17, 82*4, 82*22, etc.

I've tried this way:

result_list_3 = []
for i in (my_list):
    result_list_3.append(i * my_list_2)

And I'm getting the error:

TypeError: can't multiply sequence by non-int of type 'list'

Then I made a dictionary and a pd.DataFrame to try the following:

df['result_list_3'] = df['my_list_1'] * df['my_list_2'] 

...and I get an giant list of integers, which obviously is not the result I'm looking for.

Answer 1

Define my_list_1, my_list_2 as np.array as follows:

my_list_1 = np.array([17, 4, 22, 10, 18, 19, 23, 12])
my_list_2 = np.array([82])

Then, we can use the broadcasting feature of numpy array like below:

my_list_3 = my_list_1 * my_list_2

You will get:

print(my_list_3)

array([1394,  328, 1804,  820, 1476, 1558, 1886,  984])