For Loop with List Comprehension

[muzikman]

Is this the easiest way to get the format below? I just hate hard coding the value x + 1, might as well just insert the digit 1. What if I didn't know the length,of the variable value, then what would I do?

BTW..This list comprehension is extremely powerful. It added each number in list1 to each number in list2. That's like 25 times.

list1 = [30, 50, 110, 40, 15, 75]
list2 = [10, 60, 20, 50]

sum_list = [(n1, n2) for n1 in list1 for n2 in list2 if n1 + n2 > 100]

for index, value in enumerate(sum_list):
    for x in range(len(value) - 1):
        print(value[x], value[x + 1])

OUTPUT:
50 60
110 10
110 60
110 20
110 50
75 60
75 50

[deanhystad]

for x in sum_list:
    print(*x)

This for loop doesn't do anything:

for x in range(len(value) - 1):
print(value[x], value[x + 1])

# does same as
print(value[0], value[1])

[bowlofred]

First of all, there's no need to explicitly count how many items there are and index into the list. Once you have your sum_list, you can just loop over the items to print them. (I'll show that below).

The other thing is if you need all the matchups from two lists, there's a function called product() that will generate them. Combining the two, you could do the above as:

from itertools import product

list1 = [30, 50, 110, 40, 15, 75]
list2 = [10, 60, 20, 50]

sum_list = [p for p in product(list1, list2) if sum(p) > 100]

for x, y in sum_list:
    print(x, y)

# or could do instead...
#for t in sum_list:
#    print(t[0], t[1])

[buran]

for item in sum_list:
    print(*item, sep=' ')

not sure why you use enumerate on line 5.
Also the loop on line 6 does not make sense at all and is not needed at all.

you can simplify the list comprehension using itertools.product

from itertools import product
list1 = [30, 50, 110, 40, 15, 75]
list2 = [10, 60, 20, 50]
sum_list = [item for item in product(list1, list2) if sum(item) > 100]
for item in sum_list:
    print(*item, sep=' ')

[muzikman]

Actually, this won't work with x + anything greater than 1. So, I should have just hard coded the numbers in there, As such:

list1 = [30, 50, 110, 40, 15, 75]
list2 = [10, 60, 20, 50, 80]
list3 = [59, 68, 20, 78, 98]

sum_list = [(n1, n2, n3) for n1 in list1 for n2 in list2 for n3 in list3 if n1 + n2 + n3 > 100]

for index, value in enumerate(sum_list):
    for x in range(len(value) - 1):
        print(value[x], value[1], value[2])

[buran]

Actually, this won't work with x + anything greater than 1. So, I should have just hard coded the numbers in there, As such:

Nonsense
This will work for any number of lists, as long as you supply them as arguments to itertools.product

from itertools import product
list1 = [30, 50, 110, 40, 15, 75]
list2 = [10, 60, 20, 50]
sum_list = [item for item in product(list1, list2) if sum(item) > 100]
for item in sum_list:
    print(*item, sep=' ')

from itertools import product

list1 = [30, 50, 110, 40, 15, 75]
list2 = [10, 60, 20, 50]
list3 = [59, 68, 20, 78, 98]

sum_list = [item for item in product(list1, list2, list3) if sum(item) > 100]
for item in sum_list:
    print(*item, sep=' ')

Output:
30 10 68
30 10 78
30 10 98
30 60 59
30 60 68
30 60 20
30 60 78
30 60 98
30 20 59
30 20 68
30 20 78
30 20 98
30 50 59
30 50 68
30 50 78
30 50 98
50 10 59
50 10 68
50 10 78
50 10 98
50 60 59
50 60 68
50 60 20
50 60 78
50 60 98
50 20 59
50 20 68
50 20 78
50 20 98
50 50 59
50 50 68
50 50 20
50 50 78
50 50 98
110 10 59
110 10 68
110 10 20
110 10 78
110 10 98
110 60 59
110 60 68
110 60 20
110 60 78
110 60 98
110 20 59
110 20 68
110 20 20
110 20 78
110 20 98
110 50 59
110 50 68
110 50 20
110 50 78
110 50 98
40 10 59
40 10 68
40 10 78
40 10 98
40 60 59
40 60 68
40 60 20
40 60 78
40 60 98
40 20 59
40 20 68
40 20 78
40 20 98
40 50 59
40 50 68
40 50 20
40 50 78
40 50 98
15 10 78
15 10 98
15 60 59
15 60 68
15 60 78
15 60 98
15 20 68
15 20 78
15 20 98
15 50 59
15 50 68
15 50 78
15 50 98
75 10 59
75 10 68
75 10 20
75 10 78
75 10 98
75 60 59
75 60 68
75 60 20
75 60 78
75 60 98
75 20 59
75 20 68
75 20 20
75 20 78
75 20 98
75 50 59
75 50 68
75 50 20
75 50 78
75 50 98

[muzikman]

Thank you for all the input. First of all, I am learning Python from scratch and can't use any of the functions such as product, etc. I need to do it with what I have learned thus far.

1. I agree, the second loop is not necessary. I went through it and debugged.
The reason I added the other loop is because I didn't truly understand that the sum_list had already taken care of it.
Here is the new code. I adjusted it according to "bowlofred" without the "product" function. What does this function do anyway?

list1 = [30, 50, 110, 40, 15, 75]
list2 = [10, 60, 20, 50, 80]


sum_list = [(n1, n2) for n1 in list1 for n2 in list2 if n1 + n2 > 100]

for index, value in sum_list:
        print(index, value)

OUTPUT:

30 80
50 60
50 80
110 10
110 60
110 20
110 50
110 80
40 80
75 60
75 50
75 80

[muzikman]

That is the way to do it for sure. Unlimited lists without changing a thing. Your print function takes an indefinite amount of params and separates them with a space. I like the way you did all of this.


Remember people: I am following a book and was just introduced to List Comprehensions. :)

This is great. The support on here is awesome.

[muzikman]

Buran:

That is the way it is done for sure. Your print function takes an indefinite amount of params and separates them by a space. You can add as many lists as you like and it would still work.

Remember People: I am following a book and just learned about List Comprehension today.

This place is great. All of these responses after an hour posting it.

Thank you all so much.

[muzikman]

I tried your code and it is much faster. I added a 4th list.

from itertools import product

list1 = [30, 50, 110, 40, 15, 75]
list2 = [10, 60, 20, 50]
list3 = [59, 68, 20, 78, 98]
list4 = [66, 77, 33, 22, 11]

sum_list = [item for item in product(list1, list2, list3, list4) if sum(item) > 100]
for item in sum_list:
    print(*item, sep=' ')

Output:
30 10 59 66
30 10 59 77
30 10 59 33
30 10 59 22
30 10 59 11
30 10 68 66
30 10 68 77
30 10 68 33
30 10 68 22
30 10 68 11
30 10 20 66
30 10 20 77
30 10 78 66
30 10 78 77
30 10 78 33
30 10 78 22
30 10 78 11
30 10 98 66
30 10 98 77
30 10 98 33
30 10 98 22
30 10 98 11
30 60 59 66
30 60 59 77
30 60 59 33
30 60 59 22
30 60 59 11
30 60 68 66
30 60 68 77
30 60 68 33
30 60 68 22
30 60 68 11
30 60 20 66
30 60 20 77
30 60 20 33
30 60 20 22
30 60 20 11
30 60 78 66
30 60 78 77
30 60 78 33
30 60 78 22
30 60 78 11
30 60 98 66
30 60 98 77
30 60 98 33
30 60 98 22
30 60 98 11
30 20 59 66
30 20 59 77
30 20 59 33
30 20 59 22
30 20 59 11
30 20 68 66
30 20 68 77
30 20 68 33
30 20 68 22
30 20 68 11
30 20 20 66
30 20 20 77
30 20 20 33
30 20 78 66
30 20 78 77
30 20 78 33
30 20 78 22
30 20 78 11
30 20 98 66
30 20 98 77
30 20 98 33
30 20 98 22
30 20 98 11
30 50 59 66
30 50 59 77
30 50 59 33
30 50 59 22
30 50 59 11
30 50 68 66
30 50 68 77
30 50 68 33
30 50 68 22
30 50 68 11
30 50 20 66
30 50 20 77
30 50 20 33
30 50 20 22
30 50 20 11
30 50 78 66
30 50 78 77
30 50 78 33
30 50 78 22
30 50 78 11
30 50 98 66
30 50 98 77
30 50 98 33
30 50 98 22
30 50 98 11
50 10 59 66
50 10 59 77
50 10 59 33
50 10 59 22
50 10 59 11
50 10 68 66
50 10 68 77
50 10 68 33
50 10 68 22
50 10 68 11
50 10 20 66
50 10 20 77
50 10 20 33
50 10 20 22
50 10 78 66
50 10 78 77
50 10 78 33
50 10 78 22
50 10 78 11
50 10 98 66
50 10 98 77
50 10 98 33
50 10 98 22
50 10 98 11
50 60 59 66
50 60 59 77
50 60 59 33
50 60 59 22
50 60 59 11
50 60 68 66
50 60 68 77
50 60 68 33
50 60 68 22
50 60 68 11
50 60 20 66
50 60 20 77
50 60 20 33
50 60 20 22
50 60 20 11
50 60 78 66
50 60 78 77
50 60 78 33
50 60 78 22
50 60 78 11
50 60 98 66
50 60 98 77
50 60 98 33
50 60 98 22
50 60 98 11
50 20 59 66
50 20 59 77
50 20 59 33
50 20 59 22
50 20 59 11
50 20 68 66
50 20 68 77
50 20 68 33
50 20 68 22
50 20 68 11
50 20 20 66
50 20 20 77
50 20 20 33
50 20 20 22
50 20 20 11
50 20 78 66
50 20 78 77
50 20 78 33
50 20 78 22
50 20 78 11
50 20 98 66
50 20 98 77
50 20 98 33
50 20 98 22
50 20 98 11
50 50 59 66
50 50 59 77
50 50 59 33
50 50 59 22
50 50 59 11
50 50 68 66
50 50 68 77
50 50 68 33
50 50 68 22
50 50 68 11
50 50 20 66
50 50 20 77
50 50 20 33
50 50 20 22
50 50 20 11
50 50 78 66
50 50 78 77
50 50 78 33
50 50 78 22
50 50 78 11
50 50 98 66
50 50 98 77
50 50 98 33
50 50 98 22
50 50 98 11
110 10 59 66
110 10 59 77
110 10 59 33
110 10 59 22
110 10 59 11
110 10 68 66
110 10 68 77
110 10 68 33
110 10 68 22
110 10 68 11
110 10 20 66
110 10 20 77
110 10 20 33
110 10 20 22
110 10 20 11
110 10 78 66
110 10 78 77
110 10 78 33
110 10 78 22
110 10 78 11
110 10 98 66
110 10 98 77
110 10 98 33
110 10 98 22
110 10 98 11
110 60 59 66
110 60 59 77
110 60 59 33
110 60 59 22
110 60 59 11
110 60 68 66
110 60 68 77
110 60 68 33
110 60 68 22
110 60 68 11
110 60 20 66
110 60 20 77
110 60 20 33
110 60 20 22
110 60 20 11
110 60 78 66
110 60 78 77
110 60 78 33
110 60 78 22
110 60 78 11
110 60 98 66
110 60 98 77
110 60 98 33
110 60 98 22
110 60 98 11
110 20 59 66
110 20 59 77
110 20 59 33
110 20 59 22
110 20 59 11
110 20 68 66
110 20 68 77
110 20 68 33
110 20 68 22
110 20 68 11
110 20 20 66
110 20 20 77
110 20 20 33
110 20 20 22
110 20 20 11
110 20 78 66
110 20 78 77
110 20 78 33
110 20 78 22
110 20 78 11
110 20 98 66
110 20 98 77
110 20 98 33
110 20 98 22
110 20 98 11
110 50 59 66
110 50 59 77
110 50 59 33
110 50 59 22
110 50 59 11
110 50 68 66
110 50 68 77
110 50 68 33
110 50 68 22
110 50 68 11
110 50 20 66
110 50 20 77
110 50 20 33
110 50 20 22
110 50 20 11
110 50 78 66
110 50 78 77
110 50 78 33
110 50 78 22
110 50 78 11
110 50 98 66
110 50 98 77
110 50 98 33
110 50 98 22
110 50 98 11
40 10 59 66
40 10 59 77
40 10 59 33
40 10 59 22
40 10 59 11
40 10 68 66
40 10 68 77
40 10 68 33
40 10 68 22
40 10 68 11
40 10 20 66
40 10 20 77
40 10 20 33
40 10 78 66
40 10 78 77
40 10 78 33
40 10 78 22
40 10 78 11
40 10 98 66
40 10 98 77
40 10 98 33
40 10 98 22
40 10 98 11
40 60 59 66
40 60 59 77
40 60 59 33
40 60 59 22
40 60 59 11
40 60 68 66
40 60 68 77
40 60 68 33
40 60 68 22
40 60 68 11
40 60 20 66
40 60 20 77
40 60 20 33
40 60 20 22
40 60 20 11
40 60 78 66
40 60 78 77
40 60 78 33
40 60 78 22
40 60 78 11
40 60 98 66
40 60 98 77
40 60 98 33
40 60 98 22
40 60 98 11
40 20 59 66
40 20 59 77
40 20 59 33
40 20 59 22
40 20 59 11
40 20 68 66
40 20 68 77
40 20 68 33
40 20 68 22
40 20 68 11
40 20 20 66
40 20 20 77
40 20 20 33
40 20 20 22
40 20 78 66
40 20 78 77
40 20 78 33
40 20 78 22
40 20 78 11
40 20 98 66
40 20 98 77
40 20 98 33
40 20 98 22
40 20 98 11
40 50 59 66
40 50 59 77
40 50 59 33
40 50 59 22
40 50 59 11
40 50 68 66
40 50 68 77
40 50 68 33
40 50 68 22
40 50 68 11
40 50 20 66
40 50 20 77
40 50 20 33
40 50 20 22
40 50 20 11
40 50 78 66
40 50 78 77
40 50 78 33
40 50 78 22
40 50 78 11
40 50 98 66
40 50 98 77
40 50 98 33
40 50 98 22
40 50 98 11
15 10 59 66
15 10 59 77
15 10 59 33
15 10 59 22
15 10 68 66
15 10 68 77
15 10 68 33
15 10 68 22
15 10 68 11
15 10 20 66
15 10 20 77
15 10 78 66
15 10 78 77
15 10 78 33
15 10 78 22
15 10 78 11
15 10 98 66
15 10 98 77
15 10 98 33
15 10 98 22
15 10 98 11
15 60 59 66
15 60 59 77
15 60 59 33
15 60 59 22
15 60 59 11
15 60 68 66
15 60 68 77
15 60 68 33
15 60 68 22
15 60 68 11
15 60 20 66
15 60 20 77
15 60 20 33
15 60 20 22
15 60 20 11
15 60 78 66
15 60 78 77
15 60 78 33
15 60 78 22
15 60 78 11
15 60 98 66
15 60 98 77
15 60 98 33
15 60 98 22
15 60 98 11
15 20 59 66
15 20 59 77
15 20 59 33
15 20 59 22
15 20 59 11
15 20 68 66
15 20 68 77
15 20 68 33
15 20 68 22
15 20 68 11
15 20 20 66
15 20 20 77
15 20 78 66
15 20 78 77
15 20 78 33
15 20 78 22
15 20 78 11
15 20 98 66
15 20 98 77
15 20 98 33
15 20 98 22
15 20 98 11
15 50 59 66
15 50 59 77
15 50 59 33
15 50 59 22
15 50 59 11
15 50 68 66
15 50 68 77
15 50 68 33
15 50 68 22
15 50 68 11
15 50 20 66
15 50 20 77
15 50 20 33
15 50 20 22
15 50 78 66
15 50 78 77
15 50 78 33
15 50 78 22
15 50 78 11
15 50 98 66
15 50 98 77
15 50 98 33
15 50 98 22
15 50 98 11
75 10 59 66
75 10 59 77
75 10 59 33
75 10 59 22
75 10 59 11
75 10 68 66
75 10 68 77
75 10 68 33
75 10 68 22
75 10 68 11
75 10 20 66
75 10 20 77
75 10 20 33
75 10 20 22
75 10 20 11
75 10 78 66
75 10 78 77
75 10 78 33
75 10 78 22
75 10 78 11
75 10 98 66
75 10 98 77
75 10 98 33
75 10 98 22
75 10 98 11
75 60 59 66
75 60 59 77
75 60 59 33
75 60 59 22
75 60 59 11
75 60 68 66
75 60 68 77
75 60 68 33
75 60 68 22
75 60 68 11
75 60 20 66
75 60 20 77
75 60 20 33
75 60 20 22
75 60 20 11
75 60 78 66
75 60 78 77
75 60 78 33
75 60 78 22
75 60 78 11
75 60 98 66
75 60 98 77
75 60 98 33
75 60 98 22
75 60 98 11
75 20 59 66
75 20 59 77
75 20 59 33
75 20 59 22
75 20 59 11
75 20 68 66
75 20 68 77
75 20 68 33
75 20 68 22
75 20 68 11
75 20 20 66
75 20 20 77
75 20 20 33
75 20 20 22
75 20 20 11
75 20 78 66
75 20 78 77
75 20 78 33
75 20 78 22
75 20 78 11
75 20 98 66
75 20 98 77
75 20 98 33
75 20 98 22
75 20 98 11
75 50 59 66
75 50 59 77
75 50 59 33
75 50 59 22
75 50 59 11
75 50 68 66
75 50 68 77
75 50 68 33
75 50 68 22
75 50 68 11
75 50 20 66
75 50 20 77
75 50 20 33
75 50 20 22
75 50 20 11
75 50 78 66
75 50 78 77
75 50 78 33
75 50 78 22
75 50 78 11
75 50 98 66
75 50 98 77
75 50 98 33
75 50 98 22
75 50 98 11