with open('hello.txt', 'w+') as f:
    f.write('Hello world')
    f.seek(0)
    y = f.read()
    print y

#with this format, the file will automatically close after the indent block. If you want to avoid #this, use the following format:

x = open('hello.txt', 'w+')
x.write('Hello world')
x.seek(0)
z = x.read()
print z
x.close()

#I used w+ because I wanted to read and write from the same file without closing and reopening it. In #general, use 'a' to append (as opposed to writing over), 'r' to read, and 'w' to write.