% cat maker.py
file = open('myfile.txt', 'w')
file.write('Hello file world!\n')
file.close()                         # close not always needed

% cat reader.py
file = open('myfile.txt', 'r')
print file.read()

% python maker.py
% python reader.py
Hello file world!

% ls -l myfile.txt
-rwxrwxrwa   1 0        0             19 Apr 13 16:33 myfile.txt