Splitting numeric litterals
in [Python]
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From: candide on 14 Jul 2010 21:30 The escape sequence \ENTER allows to split a string over 2 consecutive lines. On the other hand, it seems impossible to split a numeric litteral across multiple lines, compare : >>> "1000\ .... 000\ .... 000" '1000000000' >>> 1000\ .... 000\ File "<stdin>", line 2 000\ ^ SyntaxError: invalid syntax >>> Is this the general behaviour ? So, how do you edit code containing a very very long numeric constant ?
From: Steven D'Aprano on 14 Jul 2010 21:57 On Thu, 15 Jul 2010 03:30:24 +0200, candide wrote: > The escape sequence \ENTER allows to split a string over 2 consecutive > lines. On the other hand, it seems impossible to split a numeric > litteral across multiple lines [...] > Is this the general behaviour ? Yes. You can't put any whitespace in the middle of a numeric literal: >>> n = 4 2 File "<stdin>", line 1 n = 4 2 ^ SyntaxError: invalid syntax > So, how do you edit code containing a very very long numeric constant ? s = ( "1234567890123456789012345678901234567890" "1234567890123456789012345678901234567890" "1234567890123456789012345678901234567890" "1234567890123456789012345678901234567890" "1234567890123456789012345678901234567890" ) assert len(s) == 200 n = int(s) -- Steven
From: MRAB on 14 Jul 2010 22:02 candide wrote: > The escape sequence \ENTER allows to split a string over 2 consecutive > lines. On the other hand, it seems impossible to split a numeric > litteral across multiple lines, compare : > > >>> "1000\ > ... 000\ > ... 000" > '1000000000' > >>> 1000\ > ... 000\ > File "<stdin>", line 2 > 000\ > ^ > SyntaxError: invalid syntax > >>> > > > Is this the general behaviour ? So, how do you edit code containing a > very very long numeric constant ? Normally it's only string literals that could be so long that you might want to split them over several lines. It is somewhat unusual to have a _numeric_ literal that's very very long! For an integer literal you could use a string literal and convert it to an integer: >>> int("1000\ 000\ 000") 1000000000 >>>
From: candide on 14 Jul 2010 22:37 MRAB a �crit : > want to split them over several lines. It is somewhat unusual to have a > _numeric_ literal that's very very long! > I agree. But consider RSA-155 for instance ... ;) > For an integer literal you could use a string literal and convert it to > an integer: > > >>> int("1000\ > 000\ > 000") > 1000000000 > >>> OK. In C, the following code is allowed : int x=1000\ 000\ 000; but not very usefull for sure !
From: Lawrence D'Oliveiro on 15 Jul 2010 23:22
In message <mailman.749.1279159335.1673.python-list(a)python.org>, MRAB wrote: > Normally it's only string literals that could be so long that you might > want to split them over several lines. It is somewhat unusual to have a > _numeric_ literal that's very very long! Seems a peculiar assumption to make in a language that allows integers of arbitrary length, does it not? |