python解释器上的简单if语句

Question

Environment:

• Fedora 27 (GNU/Linux)
• terminal
• python3.6.3

I am having problems running this simple lines of code in the python interpreter, this is an only if statement or alone if statement.

n = 5
if n == 4:
    print('n=4')
print('done')

This must print the word "done", but what am I doing wrong?

Answer 1

The interpreter gives you a line after blocks to leave blank for the interpreter to know your block is over (or to put an else , etc.). Putting something there makes it freak out. Just leave it that line blank and wait for the next >>> before your print('done') .

>>> n = 5
>>> if n == 4:
...    print('n=4')
...
>>> print('done')
done

Answer 2

If it is an older version of python, forget the brackets and just say

print 'n==4'

and

print 'done'

This is because in older versions of python (2.7) brackets were not needed for the print statement. I see that you are saying it is python3.x, but that is the only thing I can think of; this code works perfectly for me both in pycharm and in the official IDLE.