Чтение чисел из файла и запись в файл

>>> lst = [eval(i) for i in input('enter: ').split()]
enter: 1 2 3 4 5.5 1+3j
>>> lst
[1, 2, 3, 4, 5.5, (1+3j)]
>>>

>>> import sys
>>> sys.stdin = open('/etc/passwd')
>>> s = input()
>>> s
'root:x:0:0:root:/root:/bin/bash'
>>> sys.stdin.close()
>>>

>>> import sys
>>> sys.stdout = open('file.txt', 'w')
>>> print(1, 2, 3)
>>> sys.stdout.close()
>>>

>>> lst = [eval(i) for i in input('enter: ').split()]
enter: '1 3 5.6 7 8+3j'
>>> lst
[1, 3, 5.5999999999999996, 7, (8+3j)]
>>>

>>> lst = [eval(i) for i in raw_input('enter: ').split()]
enter: 1 2 3 4 5.5 1+3j
>>> lst
[1, 2, 3, 4, 5.5, (1+3j)]
>>>

>>> lst = [eval(i) for i in raw_input('enter: ').split()]
enter: 1 3 5.6 7 8+3j
>>> lst
[1, 3, 5.6, 7, (8+3j)]
>>>

>>> lst = [eval(i) for i in input('enter: ').split()]
enter: '1 3 5.6 7 8+3j'
>>> lst
[1, 3, 5.6, 7, (8+3j)]
>>>

import sys
sys.stdin = open('sequence.in', 'r')
sys.stdout = open('sequence.out', 'w')
a = [eval(i) for i in raw_input().split()]
n=a[0]
del(a[0])
b=a
a.reverse()
if n<>1:
    for i in range(0,n//2):
        print(a[i],b[n-i-1])
if (n%2)==1:
    print(a[n//2])

for i in input().split():
    a.append(int(i))

import random as r
n=int(input("Введите длину списка"))
lst=[]
for i in range(n):
    lst.append(int(r.random()*41-20))
print lst
l1=lst[len(lst)//2:]
l2=lst[:len(lst)//2]
l1=list(reversed(l1))
ln=[]
for i in range(len(l2)):
    ln=ln+l2[i:i+1]+l1[i:i+1]
if n%2==1:
    ln=ln+lst[len(lst)//2:len(lst)//2+1]
print ln