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How to change the first character of the line to uppercase in a text
file?
e.g.
input is:
abc xyz
Bd ef
gH ij

output should be:
Abc xyz
Bd ef
GH ij

On 6/26/2009 12:43 PM powah said...
> How to change the first character of the line to uppercase in a text
> file?
> e.g.
> input is:
> abc xyz
> Bd ef
> gH ij
>
> output should be:
> Abc xyz
> Bd ef
> GH ij

How far have you gotten?

Emile

On Fri, Jun 26, 2009 at 12:43 PM, powah<> wrote:
> How to change the first character of the line to uppercase in a text
> file?
> e.g.
> input is:
> abc xyz
> Bd ef
> gH ij
>
> output should be:
> Abc xyz
> Bd ef
> GH ij

We're not in the business of doing homework. Some hints though:

`s.upper()` converts the string in variable `s` to all upper case
(e.g. "aBcD".upper() --> "ABCD")
`for line in afile:` iterates over each line in a file object. `afile`
is the file object and `line` gets assigned each line in turn.
`s[x]` gets you the (x+1)-th character in the string `s` (e.g.
"abcd"[2] --> "c")

And here are the docs on working with files:
http://docs.python.org/library/functions.html#open
http://docs.python.org/library/stdty...l#file-objects

That should be enough to get you started.

Cheers,
Chris
--
http://blog.rebertia.com

powah wrote:
> How to change the first character of the line to uppercase in a text
> file?
> e.g.
> input is:
> abc xyz
> Bd ef
> gH ij
>
> output should be:
> Abc xyz
> Bd ef
> GH ij

While you're asking the Python list, I'd just use GNU sed:

sed -i 's/./\U&/' myfile.txt

I don't know if the "\U"=="make the replacement uppercase" is a
GNU-sed specific thing, but it works here on my Debian box's
version 4.1.5 when I tested it.

-tkc

On Jun 26, 4:51*pm, Chris Rebert <c...@rebertia.com> wrote:
> On Fri, Jun 26, 2009 at 12:43 PM, powah<wong_po...@yahoo.ca> wrote:
> > How to change the first character of the line to uppercase in a text
> > file?
> > e.g.
> > input is:
> > abc xyz
> > Bd ef
> > gH ij
>
> > output should be:
> > Abc xyz
> > Bd ef
> > GH ij
>
> We're not in the business of doing homework. Some hints though:
>
> `s.upper()` converts the string in variable `s` to all upper case
> (e.g. "aBcD".upper() --> "ABCD")
> `for line in afile:` iterates over each line in a file object. `afile`
> is the file object and `line` gets assigned each line in turn.
> `s[x]` gets you the (x+1)-th character in the string `s` (e.g.
> "abcd"[2] --> "c")
>
> And here are the docs on working with files:http://docs.python.org/library/funct...l#file-objects
>
> That should be enough to get you started.
>
> Cheers,
> Chris
> --http://blog.rebertia.com

Thank you for your hint.
This is my solution:
f = open('test', 'r')
for line in f:
print line[0].upper()+line[1:],

On Fri, 26 Jun 2009 18:58:27 -0700 (PDT), powah
<> wrote:

>Thank you for your hint.
>This is my solution:
>f = open('test', 'r')
>for line in f:
> print line[0].upper()+line[1:],

Will your program handle empty lines of input correctly?
--
Angus Rodgers

On Sat, 27 Jun 2009 11:39:28 +0100, I asked rhetorically:

>On Fri, 26 Jun 2009 18:58:27 -0700 (PDT), powah
><> wrote:
>
>>Thank you for your hint.
>>This is my solution:
>>f = open('test', 'r')
>>for line in f:
>> print line[0].upper()+line[1:],
>
>Will your program handle empty lines of input correctly?

Strangely enough, it seems to do so, but why?
--
Angus Rodgers

Angus Rodgers wrote:

> On Sat, 27 Jun 2009 11:39:28 +0100, I asked rhetorically:
>
>>On Fri, 26 Jun 2009 18:58:27 -0700 (PDT), powah
>><> wrote:
>>
>>>Thank you for your hint.
>>>This is my solution:
>>>f = open('test', 'r')
>>>for line in f:
>>> print line[0].upper()+line[1:],
>>
>>Will your program handle empty lines of input correctly?
>
> Strangely enough, it seems to do so, but why?

Because there aren't any. When you read lines from a file there will always
be at least the newline character. Otherwise it would indeed fail:

>>> for line in "peter\npaul\n\nmary".splitlines():
.... print line[0].upper() + line[1:]
....
Peter
Paul
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
IndexError: string index out of range

On Sat, 27 Jun 2009 13:02:47 +0200, Peter Otten
<__peter__@web.de> wrote:

>Angus Rodgers wrote:
>
>> On Sat, 27 Jun 2009 11:39:28 +0100, I asked rhetorically:
>>
>>>Will your program handle empty lines of input correctly?
>>
>> Strangely enough, it seems to do so, but why?
>
>Because there aren't any. When you read lines from a file there will always
>be at least the newline character. Otherwise it would indeed fail:
>
>>>> for line in "peter\npaul\n\nmary".splitlines():
>... print line[0].upper() + line[1:]
>...
>Peter
>Paul
>Traceback (most recent call last):
> File "<stdin>", line 2, in <module>
>IndexError: string index out of range

Hmm ... the \r\n sequence at the end of a Win/DOS file seems to be
treated as a single character.

--
Angus Rodgers

On Sat, 27 Jun 2009 12:13:57 +0100, I wrote:

>the \r\n sequence at the end of a Win/DOS file

Of course, I meant the end of a line of text, not the end of
the file.

(I promise I'll try to learn to proofread my posts. This is
getting embarrassing!)
--
Angus Rodgers