def eval(self, cmd, sage_globals, locals=None):
r"""
EXAMPLES::
sage: from sage.misc.prun import prun
sage: prun.eval("len([1,2,3])", globals(), locals())
20 function calls in 0... seconds
<BLANKLINE>
Ordered by: standard name
<BLANKLINE>
...
"""
import cProfile
cmd = preparse_file(cmd, sage_globals)
return cProfile.runctx(cmd, sage_globals, locals)
def eval(self, cmd, sage_globals, locals=None):
r"""
EXAMPLES::
sage: from sage.misc.prun import prun
sage: prun.eval("len([1,2,3])", globals(), locals())
20 function calls in 0... seconds
<BLANKLINE>
Ordered by: standard name
<BLANKLINE>
...
"""
import cProfile
cmd = preparse_file(cmd, sage_globals)
return cProfile.runctx(cmd, sage_globals, locals)
def eval(self, cmd, sage_globals, locals=None):
r"""
EXAMPLES::
sage: from sage.misc.prun import prun
sage: prun(['time'],[0.1]).eval("len([1,2,3])", globals(), locals())
20 function calls in 0... seconds
<BLANKLINE>
Ordered by: internal time
<BLANKLINE>
...
"""
import cProfile, pstats
cmd = preparse_file(cmd, sage_globals)
stats = pstats.Stats(cProfile.Profile().runctx(cmd, sage_globals, locals))
stats.sort_stats(*sort_args).print_stats(*print_args)
def eval(self, cmd, sage_globals, locals=None):
r"""
EXAMPLES::
sage: from sage.misc.prun import prun
sage: prun(['time'],[0.1]).eval("len([1,2,3])", globals(), locals())
20 function calls in 0... seconds
<BLANKLINE>
Ordered by: internal time
<BLANKLINE>
...
"""
import cProfile, pstats
cmd = preparse_file(cmd, sage_globals)
stats = pstats.Stats(cProfile.Profile().runctx(
cmd, sage_globals, locals))
stats.sort_stats(*sort_args).print_stats(*print_args)
def preparse_file_named_to_stream(name, out):
r"""
Preparse file named \code{name} (presumably a .sage file), outputting to
stream \code{out}.
"""
name = os.path.abspath(name)
dir, _ = os.path.split(name)
cur = os.path.abspath(os.curdir)
os.chdir(dir)
contents = open(name).read()
contents = handle_encoding_declaration(contents, out)
parsed = preparse_file(contents, attached, do_time=True)
os.chdir(cur)
out.write("# -*- encoding: utf-8 -*-\n")
out.write('#'*70+'\n')
out.write('# This file was *autogenerated* from the file %s.\n' % name)
out.write('#'*70+'\n')
out.write(parsed)
def preparse_file_named_to_stream(name, out):
r"""
Preparse file named \code{name} (presumably a .sage file), outputting to
stream \code{out}.
"""
name = os.path.abspath(name)
dir, _ = os.path.split(name)
cur = os.path.abspath(os.curdir)
os.chdir(dir)
contents = open(name).read()
contents = handle_encoding_declaration(contents, out)
parsed = preparse_file(contents, attached, do_time=True)
os.chdir(cur)
out.write("# -*- encoding: utf-8 -*-\n")
out.write('#' * 70 + '\n')
out.write('# This file was *autogenerated* from the file %s.\n' % name)
out.write('#' * 70 + '\n')
out.write(parsed)
def sage_eval(source, locals=None, cmds='', preparse=True):
r"""
Obtain a Sage object from the input string by evaluating it using
Sage. This means calling eval after preparsing and with globals
equal to everything included in the scope of ``from sage.all
import *``.).
INPUT:
- ``source`` - a string or object with a _sage_
method
- ``locals`` - evaluate in namespace of sage.all plus
the locals dictionary
- ``cmds`` - string; sequence of commands to be run
before source is evaluated.
- ``preparse`` - (default: True) if True, preparse the
string expression.
EXAMPLES: This example illustrates that preparsing is applied.
::
sage: eval('2^3')
1
sage: sage_eval('2^3')
8
However, preparsing can be turned off.
::
sage: sage_eval('2^3', preparse=False)
1
Note that you can explicitly define variables and pass them as the
second option::
sage: x = PolynomialRing(RationalField(),"x").gen()
sage: sage_eval('x^2+1', locals={'x':x})
x^2 + 1
This example illustrates that evaluation occurs in the context of
``from sage.all import *``. Even though bernoulli has
been redefined in the local scope, when calling
``sage_eval`` the default value meaning of bernoulli
is used. Likewise for QQ below.
::
sage: bernoulli = lambda x : x^2
sage: bernoulli(6)
36
sage: eval('bernoulli(6)')
36
sage: sage_eval('bernoulli(6)')
1/42
::
sage: QQ = lambda x : x^2
sage: QQ(2)
4
sage: sage_eval('QQ(2)')
2
sage: parent(sage_eval('QQ(2)'))
Rational Field
This example illustrates setting a variable for use in evaluation.
::
sage: x = 5
sage: eval('4/3 + x', {'x':25})
26
sage: sage_eval('4/3 + x', locals={'x':25})
79/3
You can also specify a sequence of commands to be run before the
expression is evaluated::
sage: sage_eval('p', cmds='K.<x> = QQ[]\np = x^2 + 1')
x^2 + 1
If you give commands to execute and a dictionary of variables, then
the dictionary will be modified by assignments in the commands::
sage: vars = {}
sage: sage_eval('None', cmds='y = 3', locals=vars)
sage: vars['y'], parent(vars['y'])
(3, Integer Ring)
You can also specify the object to evaluate as a tuple. A 2-tuple
is assumed to be a pair of a command sequence and an expression; a
3-tuple is assumed to be a triple of a command sequence, an
expression, and a dictionary holding local variables. (In this
case, the given dictionary will not be modified by assignments in
the commands.)
::
sage: sage_eval(('f(x) = x^2', 'f(3)'))
9
sage: vars = {'rt2': sqrt(2.0)}
sage: sage_eval(('rt2 += 1', 'rt2', vars))
2.41421356237309
sage: vars['rt2']
1.41421356237310
This example illustrates how ``sage_eval`` can be
useful when evaluating the output of other computer algebra
systems.
::
sage: R.<x> = PolynomialRing(RationalField())
sage: gap.eval('R:=PolynomialRing(Rationals,["x"]);')
'Rationals[x]'
sage: ff = gap.eval('x:=IndeterminatesOfPolynomialRing(R);; f:=x^2+1;'); ff
'x^2+1'
sage: sage_eval(ff, locals={'x':x})
x^2 + 1
sage: eval(ff)
Traceback (most recent call last):
...
RuntimeError: Use ** for exponentiation, not '^', which means xor
in Python, and has the wrong precedence.
Here you can see eval simply will not work but
``sage_eval`` will.
TESTS:
We get a nice minimal error message for syntax errors, that still
points to the location of the error (in the input string)::
sage: sage_eval('RR(22/7]')
Traceback (most recent call last):
...
File "<string>", line 1
RR(Integer(22)/Integer(7)]
^
SyntaxError: unexpected EOF while parsing
::
sage: sage_eval('None', cmds='$x = $y[3] # Does Perl syntax work?')
Traceback (most recent call last):
...
File "<string>", line 1
$x = $y[Integer(3)] # Does Perl syntax work?
^
SyntaxError: invalid syntax
"""
if isinstance(source, (list, tuple)):
cmds = source[0]
if len(source) > 2:
locals = copy(source[2])
source = source[1]
if not isinstance(source, basestring):
raise TypeError("source must be a string.")
if locals is None:
locals = {}
import sage.all
if len(cmds):
cmd_seq = cmds + '\n_sage_eval_returnval_ = ' + source
if preparse:
cmd_seq = preparser.preparse_file(cmd_seq)
else:
if preparse:
source = preparser.preparse(source)
if len(cmds):
exec(cmd_seq, sage.all.__dict__, locals)
return locals['_sage_eval_returnval_']
else:
return eval(source, sage.all.__dict__, locals)
def sage_eval(source, locals=None, cmds='', preparse=True):
r"""
Obtain a Sage object from the input string by evaluating it using
Sage. This means calling eval after preparsing and with globals
equal to everything included in the scope of ``from sage.all
import *``.).
INPUT:
- ``source`` - a string or object with a _sage_
method
- ``locals`` - evaluate in namespace of sage.all plus
the locals dictionary
- ``cmds`` - string; sequence of commands to be run
before source is evaluated.
- ``preparse`` - (default: True) if True, preparse the
string expression.
EXAMPLES: This example illustrates that preparsing is applied.
::
sage: eval('2^3')
1
sage: sage_eval('2^3')
8
However, preparsing can be turned off.
::
sage: sage_eval('2^3', preparse=False)
1
Note that you can explicitly define variables and pass them as the
second option::
sage: x = PolynomialRing(RationalField(),"x").gen()
sage: sage_eval('x^2+1', locals={'x':x})
x^2 + 1
This example illustrates that evaluation occurs in the context of
``from sage.all import *``. Even though bernoulli has
been redefined in the local scope, when calling
``sage_eval`` the default value meaning of bernoulli
is used. Likewise for QQ below.
::
sage: bernoulli = lambda x : x^2
sage: bernoulli(6)
36
sage: eval('bernoulli(6)')
36
sage: sage_eval('bernoulli(6)')
1/42
::
sage: QQ = lambda x : x^2
sage: QQ(2)
4
sage: sage_eval('QQ(2)')
2
sage: parent(sage_eval('QQ(2)'))
Rational Field
This example illustrates setting a variable for use in evaluation.
::
sage: x = 5
sage: eval('4/3 + x', {'x':25})
26
sage: sage_eval('4/3 + x', locals={'x':25})
79/3
You can also specify a sequence of commands to be run before the
expression is evaluated::
sage: sage_eval('p', cmds='K.<x> = QQ[]\np = x^2 + 1')
x^2 + 1
If you give commands to execute and a dictionary of variables, then
the dictionary will be modified by assignments in the commands::
sage: vars = {}
sage: sage_eval('None', cmds='y = 3', locals=vars)
sage: vars['y'], parent(vars['y'])
(3, Integer Ring)
You can also specify the object to evaluate as a tuple. A 2-tuple
is assumed to be a pair of a command sequence and an expression; a
3-tuple is assumed to be a triple of a command sequence, an
expression, and a dictionary holding local variables. (In this
case, the given dictionary will not be modified by assignments in
the commands.)
::
sage: sage_eval(('f(x) = x^2', 'f(3)'))
9
sage: vars = {'rt2': sqrt(2.0)}
sage: sage_eval(('rt2 += 1', 'rt2', vars))
2.41421356237309
sage: vars['rt2']
1.41421356237310
This example illustrates how ``sage_eval`` can be
useful when evaluating the output of other computer algebra
systems.
::
sage: R.<x> = PolynomialRing(RationalField())
sage: gap.eval('R:=PolynomialRing(Rationals,["x"]);')
'Rationals[x]'
sage: ff = gap.eval('x:=IndeterminatesOfPolynomialRing(R);; f:=x^2+1;'); ff
'x^2+1'
sage: sage_eval(ff, locals={'x':x})
x^2 + 1
sage: eval(ff)
Traceback (most recent call last):
...
RuntimeError: Use ** for exponentiation, not '^', which means xor
in Python, and has the wrong precedence.
Here you can see eval simply will not work but
``sage_eval`` will.
TESTS:
We get a nice minimal error message for syntax errors, that still
points to the location of the error (in the input string)::
sage: sage_eval('RR(22/7]')
Traceback (most recent call last):
...
File "<string>", line 1
RR(Integer(22)/Integer(7)]
^
SyntaxError: unexpected EOF while parsing
::
sage: sage_eval('None', cmds='$x = $y[3] # Does Perl syntax work?')
Traceback (most recent call last):
...
File "<string>", line 1
$x = $y[Integer(3)] # Does Perl syntax work?
^
SyntaxError: invalid syntax
"""
if isinstance(source, (list, tuple)):
cmds = source[0]
if len(source) > 2:
locals = copy(source[2])
source = source[1]
if not isinstance(source, basestring):
raise TypeError, "source must be a string."
if locals is None:
locals = {}
import sage.all
if len(cmds):
cmd_seq = cmds + '\n_sage_eval_returnval_ = ' + source
if preparse:
cmd_seq = preparser.preparse_file(cmd_seq)
else:
if preparse:
source = preparser.preparse(source)
if len(cmds):
exec cmd_seq in sage.all.__dict__, locals
return locals['_sage_eval_returnval_']
else:
return eval(source, sage.all.__dict__, locals)
def load_a_file(argstr, globals):
s = open(argstr).read()
return preparse_file(s, globals=globals)
def load_a_file(argstr, globals):
s = open(argstr).read()
return preparse_file(s, globals=globals)