change the first character of the line to uppercase in a text file

Peter Otten __peter__ at
Sat Jun 27 07:49:57 EDT 2009

Angus Rodgers wrote:

> On Sat, 27 Jun 2009 13:02:47 +0200, Peter Otten
> <__peter__ at> 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:]
>>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 


> seems to be treated as a single character.

Yes, but "\n"[1:] will return an empty string rather than fail.

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