File handling

[knollfinder]

Although I have been programming since 1956, I can't get beyond simple things in Python, in particular, getting data into and out of files.
I opened a file ('a'), and wrote 2 lines in it, acknowledged by the character count.
Closed it, opened it to read, but reading produces blank output:

tf = open('testfile.txt', 'a')
tf.write('line1')
tf.write('line2')
tf.close
tg = open('testfile.txt', 'r')
print(tg.read())
tg.close 

The print command gives me a blank line. What am I doing wrong?

[Gribouillis]

I think you're forgetting to call the close function. Replace close with close().

[snippsat]

Also using with open which is the preferable way now,then no need to use close().
It's not so new as with open was added to Python 2.5 14-years ago
Here in all in one go.

with open('testfile.txt', 'a') as tf, open('testfile.txt') as tg:
    tf.write('line1\n')
    tf.write('line2\n')
    print(tg.read())

Or:

with open('testfile.txt', 'a') as tf:
    tf.write('line1\n')
    tf.write('line2\n')

with open('testfile.txt') as tg:
    print(tg.read())

[knollfinder]

Thanks for the replies. problem solved. It was obvious, but I couldn't see it.