Ayylmao

'''
Pétur Steinn
22.10.17
Skilaverkefni 4
'''
import csv

slettar = list()
counter = 0
counter_2 = 1

with open("slettar.txt", 'w') as file:
    for i in range(1,1001):
         if i % 2 == 0:
            file.write(str(i))
            if i < 1000:
                file.write(" ")

with open("slettar.txt", 'r') as file:
    for i in file.read().split(" "):
        slettar.append(i)
print("Listi prentaður út: " + str(slettar))
slettar = list(map(int, slettar))
print("Summa talnanna: " + str(round(sum(slettar), 2)))
print("Meðaltal talnanna: " + str(round(sum(slettar)/len(slettar), 2)))

with open("sumarslettartolur.txt", "w") as file:
    with open("slettar.txt", "w") as file_2:
        for i in slettar:
            if i % 8 == 0:
                file.write(str(i) + " ")

            else:
                file_2.write(str(i) + " ")

with open("sumarslettartolur.txt", "r") as file:
    for i in file.read().split(" "):
        if counter < 10:
            print(i, end="\t")
            counter += 1

        elif counter == 10:
            print("\n" + i ,end="\t")
            counter = 1
counter = 0
print("\n\n")

with open("primenums.txt", "w") as file:
    for p in range(2, 546):
        for i in range(2, p):
            if p % i == 0:
                break
        else:
            file.write(str(p) + " ")
print("HÉR")
with open("primenums.txt", "r") as file:
    for i in file.read().split(" "):
        if counter < 10:
            print(i, end="\t")
            counter += 1

        elif counter == 10:
            print("\n" + i ,end="\t")
            counter = 1

print("\n\n")

with open("primenums.txt", "r") as file:
    for i in file.read().split(" "):
        if "7" in str(i):
            if counter < 10:
                print(i, end="\t")
                counter += 1

            elif counter == 10:
                print("\n" + i ,end="\t")
                counter = 1


counter = 0
with open("primenums.txt", "r") as file:
    with open("fourthprimenums.txt", "w") as file_2:
        for i in file.read().split(" "):
            if counter_2 % 4 == 0:
                if counter < 10:
                    print(i, end="\t")
                    file_2.write(i + " ")
                    counter += 1

                elif counter == 10:
                    print("\n" + i, end="\t")
                    counter = 1
                    file_2.write(i + " ")
            counter_2 += 1

print("\n\n")
counter = 0
with open("fourthprimenums.txt", "r") as file:
    for i in file.read().split(" "):
        if counter < 10:
            print(i, end="\t")
            counter += 1

        elif counter == 10:
            print("\n" + i, end="\t")
            counter = 1