[Tutor] 'open' is not defined

[Emile van Sebille]

On 7/30/2015 4:41 PM, ltc.hotspot at gmail.com wrote:
> Hi Everyone:
>
>
> Why is open not defined in the following code:NameError: name 'open' is not defined

Because of something you did previously.

We don't have enough information to answer.  open exists as a built-in 
function in python:

Python 2.5 (r25:51908, Dec 18 2009, 14:22:21)
[GCC 3.4.6 20060404 (Red Hat 3.4.6-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> open
<built-in function open>


We'd need to see a full cut-n-paste example to help diagnose what's 
actually happening.  I can get a NameError with:

 >>> del open
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
NameError: name 'open' is not defined
 >>>

So, don't try to delete built-in identifiers.


For example, when I paste your code from below into a python shell, I get:

Python 2.5 (r25:51908, Dec 18 2009, 14:22:21)
[GCC 3.4.6 20060404 (Red Hat 3.4.6-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> fname = raw_input("Enter file name: ")
Enter file name: if len(fname) < 1 : fname = "mbox-short.txt"
 >>> fh = open(fname)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory: 'if len(fname) < 1 : fname 
= "mbox-short.txt"'
 >>> count = 0
 >>> for line in fh:


Please paste in the contents from your screen where the error appears. 
Note that in my example the open line complains about fname not existing 
so I'm getting and IOError, and if the issue were with open, as per the 
example with xxopen below, you then get the NameError.

 >>> fh = xxopen('yyy')
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
NameError: name 'xxopen' is not defined

Please post the equivalent from your system and we can help better.

Emile


>
>
> Code reads as follows:
>
>
>
> fname = raw_input("Enter file name: ")
> if len(fname) < 1 : fname = "mbox-short.txt"
> fh = open(fname)
> count = 0
> for line in fh:
>      if not line.startswith('From'): continue
>      line2 = line.strip()
>      line3 = line2.split()
>      line4 = line3[1]
>      print line4
>      count = count + 1
> print "There were", count, "lines in the file with From as the first word"
>
>
>
> Regards,
>
> Hal
>
>
>
>
>
>
> Sent from Surface
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