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From: Deadly Dirk on 8 Jun 2010 17:44
I am a total beginner with Python. I am reading a book ("The Quick Python
Book", 2nd edition, by Vernon Ceder) which tells me that print function
takes end="" argument not to print newline character. I tried and here is
what happens:

>>> print(x)
abc
>>> print(x,end="")
File "<stdin>", line 1
print(x,end="")
^
SyntaxError: invalid syntax
>>>

What does the error message mean? I am using Python 2.6.5 on Ubuntu 9.10.


--
The missionaries go forth to Christianize the savages -
as if the savages weren't dangerous enough already.
From: Peter Otten on 8 Jun 2010 17:54
Deadly Dirk wrote:

> I am a total beginner with Python. I am reading a book ("The Quick Python
> Book", 2nd edition, by Vernon Ceder) which tells me that print function
> takes end="" argument not to print newline character. I tried and here is
> what happens:
>
>>>> print(x)
> abc
>>>> print(x,end="")
> File "<stdin>", line 1
> print(x,end="")
> ^
> SyntaxError: invalid syntax
>>>>
>
> What does the error message mean? I am using Python 2.6.5 on Ubuntu 9.10.

There are small differences between Python 2.x and 3.x.

print(x, end="")

is Python 3 as is the whole book you are reading. I would guess that is
prominently mentioned at the very beginning?

For the examples to work you have to install Python 3.1 with

$ sudo apt-get install python3

and invoke the interpreter with

$ python3

Good luck with your efforts!

Peter
From: fred lore on 8 Jun 2010 17:55
On 8 juin, 23:44, Deadly Dirk <d...(a)plfn.invalid> wrote:
> I am a total beginner with Python. I am reading a book ("The Quick Python
> Book", 2nd edition, by Vernon Ceder) which tells me that print function
> takes end="" argument not to print newline character. I tried and here is
> what happens:
>
> >>> print(x)
> abc
> >>> print(x,end="")
>
>   File "<stdin>", line 1
>     print(x,end="")
>                ^
> SyntaxError: invalid syntax
>
> What does the error message mean? I am using Python 2.6.5 on Ubuntu 9.10.


in python 2.6.5, print is a keyword and this syntax is not allowed
print becomes a real function with few keywords arguments like "end"
only since python 3.0

Daniel
From: Robert Kern on 8 Jun 2010 17:58
On 6/8/10 5:44 PM, Deadly Dirk wrote:
> I am a total beginner with Python. I am reading a book ("The Quick Python
> Book", 2nd edition, by Vernon Ceder) which tells me that print function
> takes end="" argument not to print newline character. I tried and here is
> what happens:
>
>>>> print(x)
> abc
>>>> print(x,end="")
> File "<stdin>", line 1
> print(x,end="")
> ^
> SyntaxError: invalid syntax
>>>>
>
> What does the error message mean? I am using Python 2.6.5 on Ubuntu 9.10.

The Quick Python Book is based on Python 3, which is a major upgrade from Python
2.6 and changed some parts of Python's syntax. In particular, it changed the
print statement to a print() function.

You can install Python 3 on Ubuntu using the python3 package.

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

From: Deadly Dirk on 8 Jun 2010 18:04
On Tue, 08 Jun 2010 21:44:18 +0000, Deadly Dirk wrote:

> I am a total beginner with Python. I am reading a book ("The Quick
> Python Book", 2nd edition, by Vernon Ceder) which tells me that print
> function takes end="" argument not to print newline character. I tried
> and here is what happens:
>
>>>> print(x)
> abc
>>>> print(x,end="")
> File "<stdin>", line 1
> print(x,end="")
> ^
> SyntaxError: invalid syntax
>>>>
>>>>
> What does the error message mean? I am using Python 2.6.5 on Ubuntu
> 9.10.


I figured it out. What I need is the following:

"from __future__ import print_function" at the top of my script.



--
The missionaries go forth to Christianize the savages -
as if the savages weren't dangerous enough already.
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