Examples :

  Input:  [-1, 2, 3, -4, 5, -6, -7]  Output:  [1, -2, -3, 4, -5, 6, 7]  Input:  [-5, 9, -23, -2, 7]  Output:  [5, -9, 23, 2, -7] 

Methods # 1: List comprehension

# Python3 program for converting positives # list of integers to negative and vice versa def Convert (lst): return [ - i for i in lst]   # Driver code lst = [ - 1 , 2 , 3 , - 4 , 5 , - 6 , - 7 ] print (Convert (lst))

Exit:

 [1, -2, -3, 4, -5, 6, 7] 

Methods # 2: Using NumPy
It is also possible to use the Python Numpy module which is the most pythonic way to solve this problem. The list is first converted to a numpy array, and then the negative element of the array is returned, which is eventually converted to a list.

# Python3 positive conversion program # list of integers to negative and vice versa import numpy as np   def Convert (lst): lst = np.array (lst) return list ( - lst)    # Driver code lst = [ - 1 , 2 , 3 , - 4 , 5 , - 6 , - 7 ] print (Convert (lst))

Exit:

 [1, -2, -3, 4, -5 , 6, 7]