[pythonvis] Re: print"Hello world."
- From: "Octavian Rasnita" <orasnita@xxxxxxxxx>
- To: <pythonvis@xxxxxxxxxxxxx>
- Date: Fri, 2 May 2014 07:51:14 +0300
It was an example gave to show that the program breaks if it contains a syntax
error, without executing any line of code.
--Octavian
----- Original Message -----
From: "Charles Rivard" <wee1sman@xxxxxxxxxx>
To: <pythonvis@xxxxxxxxxxxxx>
Sent: Friday, May 02, 2014 6:36 AM
Subject: [pythonvis] Re: print"Hello world."
> "pritn"? Would that cause an error? Shouldn't it be "print"?
>
> ---
> Be positive! When it comes to being defeated, if you think you're finished,
> you! really! are! finished!
> ----- Original Message -----
> From: "Octavian Rasnita" <orasnita@xxxxxxxxx>
> To: <pythonvis@xxxxxxxxxxxxx>
> Sent: Tuesday, April 29, 2014 3:34 PM
> Subject: [pythonvis] Re: print"Hello world."
>
>
>> Yep, the results are:
>>
>> D:\>python z8.py
>> File "z8.py", line 2
>> pritn "Goodbye world!"
>> ^
>> SyntaxError: invalid syntax
>> D:\>
>>
>> So the program is not ran.
>>
>> As I said, first the program is checked for syntax, is compiled in memory
>> if the syntax is correct and if it has a syntax error no line is executed
>> from it.
>>
>> Then it is ran. But just like in any program made in any other language,
>> there may appear runtime errors like no free space on hard disk, no
>> memory, divide by zero etc.
>> All these things can't be known at compile time. Probably a program asks
>> to user to type 2 numbers and then divide one with the other.
>> The user can type anything including 0 or strings.
>> If the input is not checked then there may appear runtime errors, but that
>> doesn't mean that the program has an error, It is just poorly made because
>> it doesn't check the input data or it doesn't treat all the possible
>> exceptions etc.
>> (And this can happen in programs made in other languages also.)
>>
>> --Octavian
>>
>> ----- Original Message -----
>> From: "James Scholes" <james@xxxxxxxxxxxxx>
>> To: <pythonvis@xxxxxxxxxxxxx>
>> Sent: Tuesday, April 29, 2014 9:14 PM
>> Subject: [pythonvis] Re: print"Hello world."
>>
>>
>>> Richard Dinger wrote:
>>>> I was unable to replicate your example. The first correct print
>>>> statement did not print, I only got the error traceback.
>>>
>>> I should've realised that a syntax error would prevent the program from
>>> running at all. However, a traceback does not. For example, if you run
>>> the following code:
>>>
>>> print "Hello world!"
>>> print "Here comes a traceback when we try to divide by zero..."
>>> print 20 / 0
>>>
>>> You will see:
>>>
>>> Hello world!
>>> Here comes a traceback when we try to divide by zero...
>>> Traceback (most recent call last):
>>> File "hello.py", line 3, in <module>
>>> print 20 / 0
>>> ZeroDivisionError: integer division or modulo by zero
>>>
>>> You cannot divide a number by zero, so your program crashes and
>>> generates a traceback. However, as you can see, the file is
>>> syntactically correct, so the statements up to that point will run
>>> without a problem. Apologies for the error!
>>> --
>>> James Scholes
>>> http://twitter.com/JamesScholes
>>>
>>
>>
>
>
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