On 4/25/19 10:29 PM, Steven D'Aprano wrote:
> On Thu, Apr 25, 2019 at 10:46:31AM -0700, Roger Lea Scherer wrote:
>
>> with open('somefile') as csvDataFile:
>> csvReader = csv.reader(csvDataFile)
>> for row in range(100):
>> a = "Basic P1"
>> str.replace(a, "")
>> print(next(csvReader))
>
>
> I'm not quite sure what you expected this to do, but you've
> (deliberately? accidently?) run into one of the slightly advanced
> corners of Python: unbound methods.
accidentally, I believe.
notice that the way the Python 3 page on string methods is written, you
_could_ read it as you are to use the literal 'str' but in fact you are
expected to substitute in the name of your string object.
For this specific case:
===
str.replace(old, new[, count])
Return a copy of the string with all occurrences of substring old
replaced by new. If the optional argument count is given, only the first
count occurrences are replaced.
===
So for the example above you're expected to do (without changing the
range call, which has been commented on elsewhere: you should just
iterate directly over the reader object, that's the way it's designed):
for row in range(100):
a = "Basic P1"
row.replace(a, "")
and then hopefully actually do something with the modified 'row', not
just go on to the next iteration and throw it away...
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