python: invalid syntax on sys

Question

I am new to Python,
I tried to execute file with code:

import sys
def main():
    print sys.argv[1]

main()

For this run: hello.py from command line, but got

C:\Python34>hello.py
File "C:\Python34\hello.py", line 4
print sys.argv[1]
        ^
SyntaxError: invalid syntax

Could someone help me with this issue?

When you run `python` what version does it show? e.g. `$ python Python 2.7.5 (default, Sep 12 2013, 21:33:34) ` — Lukasz Madon, May 06 '14 at 09:51

score 5 · Answer 1 · answered May 06 '14 at 09:49

5

In Python 3.x print is no longer a statement, it is a function print(), and as suggested in PEP8, you should ident your code with 4 space per level.

import sys
def main():
    print(sys.argv[1])

main()

answered May 06 '14 at 09:49

jabaldonedo

25,822
8
77
77

milmulho · Accepted Answer · 2014-05-06T09:59:27.080

3

Python 3.4 requires ~~brackets~~ parentheses around prints. E.g. print(sys.argv[1])

edited May 06 '14 at 09:59

answered May 06 '14 at 09:48

milmulho

46
2

As a further point, it requires brackets around _all_ functions now. I made the same errors when transitioning from 2.7 too ^_^ – milmulho May 06 '14 at 09:50
`()` are called parentheses. Brackets are `[]`. – msvalkon May 06 '14 at 09:53
You're quite correct. – milmulho May 06 '14 at 09:55
1

@milmulho Functions calls have always required parentheses. The difference between Python 2 and 3 is that `print` is no longer a statement, but a function. – chepner May 06 '14 at 10:52

score -1 · Answer 3 · answered May 06 '14 at 09:49

-1

Try to insert a tab before "print sys.argv[1]"

answered May 06 '14 at 09:49

Pedro Uceda

1

python: invalid syntax on sys

3 Answers3