I am new to python, i will re-edit and make it clear :) thanks for investing your time.

I have two different lists with string values (as shown below):

1. A list with 1600 real numbers: ['-1,03E 01' '-1,26E 01' .......]

2. Another list with 1600 imaginary values: [ '-1,25E 01' '-1,02E 01' .... ]

These are directly imported from touchstone file. so, i do not see letter j for imaginary. i don't know y.

• First i have to change the type of the value from 'str' to float for further calculation.
• Then append them into a list as complex value like [[-1,03E 01 -1,25E 01 j] [-1,26E 01-1,02E 01j].......]

CodePudding user response：

Since you have edited your question to say that your numbers are actually represented by strings of float values (your second list of your second example of [7j, 8j, et.c] makes this very confusing, though):

l1 = ['-1,03E 01' '-1,26E 01']

l2 = ['-1,25E 01' '-1,02E 01']

[complex(float(a), float(b)) for a, b in zip(l1, l2)]

Original answer:

For two lists l1 containing the real values and l2 containing the imaginary values (as you describe them, but I think you mean coefficients):

[complex(a,b) for a, b in zip(l1, l2)] 

This answer will get you a list of complex values:

[(1 7j), (2 8j), (3 9j), (4 10j), (5 11j), (6 12j)]. 

As you indicated in your comment below, if you want it to be

[ [(1 7j)] [(2 8j)] [(3 9j)] [(4 10j)] [(5 11j)] [(6 12j)] ] 

as indicated in your question, then change it to

[[complex(a, b)] for a, b in zip(l1,l2)]