Операции над списками, подсписками

a=[1,2]
b=[1,1,1,1]

lst=[]
for i in a:
    for k in b:
        sum=i+k
        lst.append(sum)
        
OUT=lst

>>>>[2,2,2,2,3,3,3,3]

for i in a:
    for k in b:
        sum=i+k
        lst.append(sum)
        
chop = len(b)       
OUT = [lst[x:chop+x] for x in range(0,len(lst),chop)]

a=[1,2]
b=[1,2,3,4]

[[2, 3, 4, 5], [3, 4, 5, 6]]

#!/usr/bin/env python3
import numpy as np
 
b = np.array([1, 2, 3, 4])
a1 = np.full_like(b, 1)
a2 = np.full_like(b, 2)
res = [b+a1, b+a2]
res = list(map(list, res))
print(res)

res =[list(b+a1), list(b+a2)]

#!/usr/bin/env python3
a = [1, 2]
b = [1, 2, 3, 4]
 
result = []
for add in a:
    ls = list(b)  # copy
    for i in range(len(ls)):
        ls[i] += add
    result.append(ls)
print(result)

#!/usr/bin/env python3
 
def conv(ls):
    return list(map(lambda x: x[0], ls))
 
a = [[1], [2]]
b = [[1], [2], [3], [4]]
a = conv(a)
b = conv(b)
print(a)
print(b)

#!/usr/bin/env python3
a = [1, 2]
b = [1, 2, 3, 4]
result =[list(map(lambda x: x+add, list(b))) for add in a]
print(result)

#!/usr/bin/env python3
a=[
    ["торт","вишенка"],
    ["торт","вишенка"],
    ["торт","вишенка"],
    ["торт","вишенка"],
]
b=[1,1,1,1]
 
out = []
for ls, i in zip(a, b):
    out.append(ls[i])
print(out)

out.append([ls[i]])

#!/usr/bin/env python3
b = [1, 2, 3, 4]
b2 = b
b2[0] += 1
print(b2)  # [2, 2, 3, 4]
print(b)   # [2, 2, 3, 4] #oops...

#!/usr/bin/env python3
a = [1, 2, 3, 4]
b = [1, 2, 3, 4]
res = [i*j for i, j in zip(a, b)]
print(res)