import sys
file=sys.stdin
for line in file:
     ....

with open('1.py') as f:
    lines = f.readlines()
    print lines
for line in open('1.py'):
    print line

in_ = raw_input('path: ')# здесь укажите путь к файлу ("C:\Users\server\Desktop\1.py") например
for line in open(in_):
    print line

in_ = "C:\Users\server\Desktop\1.py"
for line in open(in_):
    print line

import os
in_ = os.path.abspath(__file__)
for line in open(in_):
    print line

import sys
print sys.argv[0]

for line in sys.stdin:
...