[issue23794] http package should support HTTP/2

[Boris Dušek]

Changes by Boris Dušek <m...@dusek.me>:


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int('\x23') != 0x23 (a.k.a convert char to integer of its byte representation)

[Boris Dušek]

Hi,

I am looking for the best way to convert a string of length 1 (= 1
character as string) to integer that has the same value as numeric
representation of that character. Background: I am writing functions
abstracting endianness, e.g. converting a string of length 4 to the
appropriate integer value (e.g. '\x01\x00\x00\x00' = 2**24 for big
endian memory, 2**0 for little endian memory). For this, I need to
know the numeric value of each byte and sum them according to
endianness.

I thought that something like int('\x01') might work, provided the
argument is string of length 1, but that throws an error:

 int('\x12')
Traceback (most recent call last):
  File stdin, line 1, in ?
ValueError: invalid literal for int():

The code I want to write looks like this:

mem = '\x11\x22\x33\x44'
factor = 1
sum = 0
for byte in mem:
sum += int(byte) * factor
factor *= 2**8

Could you please tell me how to achieve what I want in Python? (it
would be straightforward in C)

Thanks for any suggestions,
Boris Dušek

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Re: int('\x23') != 0x23 (a.k.a convert char to integer of its byte representation)

[Boris Dušek]

On Sep 15, 1:59 pm, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote:
 So you are looking for the `struct` module in the standard library instead
 of doing this yourself.  :-)

 If you insist on doing it yourself take a look at the built-in `ord()`
 function.


Thanks Marc,

both things are exactly what I was looking for (I am a bit ashamed
that I did not find the built-in ord :-)

Boris

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Base class for file-like objects? (a.k.a Stream in Java)

[Boris Dušek]

Hello,

(sorry to begin with Java in a Python list ;-)
in Java, when I want to pass input to a function, I pass
InputStream, which is a base class of any input stream.

In Python, I found that file objects exist. While specifying
argument types in Python is not possible as in Java, it is possible to
check whether an object is an instance of some class and that's what I
need - I need to check if an argument is a file-like object, and if
yes, behave accordingly, if not, treat the argument as string with
URL.

But I am afraid there is no such a base class - I tried the following:

 import urllib

 f = open(test.txt, r)
 g = urllib.urlopen(http://www.google.com/;)

 isinstance(f, file)
True
 isinstance(f, file)
False
...

Is there some base class to file-like (or stream-like) objects in
Python? And if not, is it at least planned for Python 3.0?

Thanks for any suggestions,
Boris Dušek

P.S.: The code should finally look in esence something like this:

if isinstance(f, file):
   pass
elif isinstance(f, string):
   f = urllib.urlopen(f)
else:
   raise ...
process_stream(f)

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Significance of start parameter to string method endswith

[Boris Dušek]

Hello,

what is the use-case of parameter start in string's endswith
method? Consider the following minimal example:

a = testing
suffix=ing
a.endswith(suffix, 2)

Significance of end is obvious. But not so for start.

Let's assume the end parameter is not used - then the function
should simple check that the last len(suffix) characters of a are
equal to ing, no matter where we start (the function does not *scan*
the string from the start, does it?)
Only case where it would make difference is if we had start +
len(suffix)  len(a) (excuse possible of-by-one error :-)
Then the function would never return True. But is there a real use
case when we would test for endswith like this? (knowing that it must
return false?)

Thanks for any ideas/experience.
Boris

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Re: Significance of start parameter to string method endswith

[Boris Dušek]

On Apr 19, 10:36 pm, subscriber123 [EMAIL PROTECTED] wrote:
 On Apr 19, 3:58 pm, Boris Dušek [EMAIL PROTECTED] wrote:



  Hello,

  what is the use-case of parameter start in string's endswith
  method?

 def foo(function,instance,param):
 if function(instance,param,2,4):
 return True
 else: return False

 The function must work whether you pass it
 foo(str.endswith,blaahh,ahh), or
 foo(str.startswith,blaahh,aah). This is a really bad example, but
 it gets the point across that similar functions must have similar
 parameters in order to be Pythonic.

Thanks for explanation, this point makes sense. And I agree that I can
hardly imagine any use of both parameters :-).

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