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| author | Guido van Rossum <guido@python.org> | 2001-08-08 05:00:18 +0000 |
|---|---|---|
| committer | Guido van Rossum <guido@python.org> | 2001-08-08 05:00:18 +0000 |
| commit | 4668b000a1d9113394941ad39875c827634feb49 (patch) | |
| tree | 734560442fef1ce34912ceb772099b9a006e010a /Grammar | |
| parent | 074c9d2b2081237c1071a3775f6e36252cf16ad7 (diff) | |
| download | cpython-git-4668b000a1d9113394941ad39875c827634feb49.tar.gz | |
Implement PEP 238 in its (almost) full glory.
This introduces:
- A new operator // that means floor division (the kind of division
where 1/2 is 0).
- The "future division" statement ("from __future__ import division)
which changes the meaning of the / operator to implement "true
division" (where 1/2 is 0.5).
- New overloadable operators __truediv__ and __floordiv__.
- New slots in the PyNumberMethods struct for true and floor division,
new abstract APIs for them, new opcodes, and so on.
I emphasize that without the future division statement, the semantics
of / will remain unchanged until Python 3.0.
Not yet implemented are warnings (default off) when / is used with int
or long arguments.
This has been on display since 7/31 as SF patch #443474.
Flames to /dev/null.
Diffstat (limited to 'Grammar')
| -rw-r--r-- | Grammar/Grammar | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Grammar/Grammar b/Grammar/Grammar index c791892dff..d85863e9a2 100644 --- a/Grammar/Grammar +++ b/Grammar/Grammar @@ -38,7 +38,7 @@ stmt: simple_stmt | compound_stmt simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE small_stmt: expr_stmt | print_stmt | del_stmt | pass_stmt | flow_stmt | import_stmt | global_stmt | exec_stmt | assert_stmt expr_stmt: testlist (augassign testlist | ('=' testlist)*) -augassign: '+=' | '-=' | '*=' | '/=' | '%=' | '&=' | '|=' | '^=' | '<<=' | '>>=' | '**=' +augassign: '+=' | '-=' | '*=' | '/=' | '%=' | '&=' | '|=' | '^=' | '<<=' | '>>=' | '**=' | '//=' # For normal assignments, additional restrictions enforced by the interpreter print_stmt: 'print' ( [ test (',' test)* [','] ] | '>>' test [ (',' test)+ [','] ] ) del_stmt: 'del' exprlist @@ -77,7 +77,7 @@ xor_expr: and_expr ('^' and_expr)* and_expr: shift_expr ('&' shift_expr)* shift_expr: arith_expr (('<<'|'>>') arith_expr)* arith_expr: term (('+'|'-') term)* -term: factor (('*'|'/'|'%') factor)* +term: factor (('*'|'/'|'%'|'//') factor)* factor: ('+'|'-'|'~') factor | power power: atom trailer* ('**' factor)* atom: '(' [testlist] ')' | '[' [listmaker] ']' | '{' [dictmaker] '}' | '`' testlist '`' | NAME | NUMBER | STRING+ |