465 lines
15 KiB
Python
465 lines
15 KiB
Python
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"""Tools for setting up interactive sessions. """
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from sympy.external.importtools import version_tuple
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from sympy.interactive.printing import init_printing
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preexec_source = """\
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from __future__ import division
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from sympy import *
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x, y, z, t = symbols('x y z t')
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k, m, n = symbols('k m n', integer=True)
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f, g, h = symbols('f g h', cls=Function)
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init_printing()
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"""
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verbose_message = """\
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These commands were executed:
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%(source)s
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Documentation can be found at https://docs.sympy.org/%(version)s
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"""
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no_ipython = """\
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Couldn't locate IPython. Having IPython installed is greatly recommended.
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See http://ipython.scipy.org for more details. If you use Debian/Ubuntu,
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just install the 'ipython' package and start isympy again.
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"""
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def _make_message(ipython=True, quiet=False, source=None):
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"""Create a banner for an interactive session. """
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from sympy import __version__ as sympy_version
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from sympy.external.gmpy import GROUND_TYPES
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from sympy.utilities.misc import ARCH
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from sympy import SYMPY_DEBUG
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import sys
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import os
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if quiet:
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return ""
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python_version = "%d.%d.%d" % sys.version_info[:3]
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if ipython:
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shell_name = "IPython"
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else:
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shell_name = "Python"
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info = ['ground types: %s' % GROUND_TYPES]
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cache = os.getenv('SYMPY_USE_CACHE')
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if cache is not None and cache.lower() == 'no':
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info.append('cache: off')
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if SYMPY_DEBUG:
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info.append('debugging: on')
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args = shell_name, sympy_version, python_version, ARCH, ', '.join(info)
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message = "%s console for SymPy %s (Python %s-%s) (%s)\n" % args
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if source is None:
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source = preexec_source
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_source = ""
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for line in source.split('\n')[:-1]:
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if not line:
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_source += '\n'
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else:
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_source += '>>> ' + line + '\n'
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doc_version = sympy_version
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if 'dev' in doc_version:
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doc_version = "dev"
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else:
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doc_version = "%s/" % doc_version
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message += '\n' + verbose_message % {'source': _source,
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'version': doc_version}
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return message
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def int_to_Integer(s):
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"""
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Wrap integer literals with Integer.
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This is based on the decistmt example from
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http://docs.python.org/library/tokenize.html.
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Only integer literals are converted. Float literals are left alone.
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Examples
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========
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>>> from __future__ import division
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>>> from sympy import Integer # noqa: F401
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>>> from sympy.interactive.session import int_to_Integer
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>>> s = '1.2 + 1/2 - 0x12 + a1'
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>>> int_to_Integer(s)
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'1.2 +Integer (1 )/Integer (2 )-Integer (0x12 )+a1 '
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>>> s = 'print (1/2)'
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>>> int_to_Integer(s)
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'print (Integer (1 )/Integer (2 ))'
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>>> exec(s)
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0.5
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>>> exec(int_to_Integer(s))
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1/2
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"""
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from tokenize import generate_tokens, untokenize, NUMBER, NAME, OP
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from io import StringIO
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def _is_int(num):
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"""
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Returns true if string value num (with token NUMBER) represents an integer.
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"""
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# XXX: Is there something in the standard library that will do this?
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if '.' in num or 'j' in num.lower() or 'e' in num.lower():
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return False
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return True
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result = []
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g = generate_tokens(StringIO(s).readline) # tokenize the string
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for toknum, tokval, _, _, _ in g:
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if toknum == NUMBER and _is_int(tokval): # replace NUMBER tokens
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result.extend([
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(NAME, 'Integer'),
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(OP, '('),
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(NUMBER, tokval),
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(OP, ')')
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])
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else:
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result.append((toknum, tokval))
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return untokenize(result)
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def enable_automatic_int_sympification(shell):
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"""
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Allow IPython to automatically convert integer literals to Integer.
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"""
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import ast
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old_run_cell = shell.run_cell
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def my_run_cell(cell, *args, **kwargs):
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try:
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# Check the cell for syntax errors. This way, the syntax error
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# will show the original input, not the transformed input. The
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# downside here is that IPython magic like %timeit will not work
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# with transformed input (but on the other hand, IPython magic
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# that doesn't expect transformed input will continue to work).
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ast.parse(cell)
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except SyntaxError:
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pass
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else:
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cell = int_to_Integer(cell)
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old_run_cell(cell, *args, **kwargs)
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shell.run_cell = my_run_cell
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def enable_automatic_symbols(shell):
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"""Allow IPython to automatically create symbols (``isympy -a``). """
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# XXX: This should perhaps use tokenize, like int_to_Integer() above.
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# This would avoid re-executing the code, which can lead to subtle
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# issues. For example:
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#
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# In [1]: a = 1
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#
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# In [2]: for i in range(10):
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# ...: a += 1
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# ...:
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#
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# In [3]: a
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# Out[3]: 11
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#
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# In [4]: a = 1
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#
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# In [5]: for i in range(10):
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# ...: a += 1
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# ...: print b
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# ...:
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# b
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# b
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# b
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# b
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# b
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# b
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# b
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# b
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# b
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# b
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#
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# In [6]: a
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# Out[6]: 12
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#
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# Note how the for loop is executed again because `b` was not defined, but `a`
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# was already incremented once, so the result is that it is incremented
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# multiple times.
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import re
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re_nameerror = re.compile(
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"name '(?P<symbol>[A-Za-z_][A-Za-z0-9_]*)' is not defined")
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def _handler(self, etype, value, tb, tb_offset=None):
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"""Handle :exc:`NameError` exception and allow injection of missing symbols. """
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if etype is NameError and tb.tb_next and not tb.tb_next.tb_next:
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match = re_nameerror.match(str(value))
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if match is not None:
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# XXX: Make sure Symbol is in scope. Otherwise you'll get infinite recursion.
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self.run_cell("%(symbol)s = Symbol('%(symbol)s')" %
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{'symbol': match.group("symbol")}, store_history=False)
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try:
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code = self.user_ns['In'][-1]
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except (KeyError, IndexError):
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pass
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else:
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self.run_cell(code, store_history=False)
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return None
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finally:
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self.run_cell("del %s" % match.group("symbol"),
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store_history=False)
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stb = self.InteractiveTB.structured_traceback(
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etype, value, tb, tb_offset=tb_offset)
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self._showtraceback(etype, value, stb)
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shell.set_custom_exc((NameError,), _handler)
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def init_ipython_session(shell=None, argv=[], auto_symbols=False, auto_int_to_Integer=False):
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"""Construct new IPython session. """
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import IPython
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if version_tuple(IPython.__version__) >= version_tuple('0.11'):
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if not shell:
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# use an app to parse the command line, and init config
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# IPython 1.0 deprecates the frontend module, so we import directly
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# from the terminal module to prevent a deprecation message from being
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# shown.
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if version_tuple(IPython.__version__) >= version_tuple('1.0'):
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from IPython.terminal import ipapp
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else:
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from IPython.frontend.terminal import ipapp
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app = ipapp.TerminalIPythonApp()
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# don't draw IPython banner during initialization:
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app.display_banner = False
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app.initialize(argv)
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shell = app.shell
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if auto_symbols:
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enable_automatic_symbols(shell)
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if auto_int_to_Integer:
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enable_automatic_int_sympification(shell)
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return shell
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else:
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from IPython.Shell import make_IPython
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return make_IPython(argv)
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def init_python_session():
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"""Construct new Python session. """
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from code import InteractiveConsole
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class SymPyConsole(InteractiveConsole):
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"""An interactive console with readline support. """
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def __init__(self):
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ns_locals = dict()
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InteractiveConsole.__init__(self, locals=ns_locals)
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try:
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import rlcompleter
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import readline
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except ImportError:
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pass
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else:
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import os
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import atexit
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readline.set_completer(rlcompleter.Completer(ns_locals).complete)
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readline.parse_and_bind('tab: complete')
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if hasattr(readline, 'read_history_file'):
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history = os.path.expanduser('~/.sympy-history')
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try:
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readline.read_history_file(history)
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except OSError:
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pass
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atexit.register(readline.write_history_file, history)
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return SymPyConsole()
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def init_session(ipython=None, pretty_print=True, order=None,
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use_unicode=None, use_latex=None, quiet=False, auto_symbols=False,
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auto_int_to_Integer=False, str_printer=None, pretty_printer=None,
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latex_printer=None, argv=[]):
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"""
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Initialize an embedded IPython or Python session. The IPython session is
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initiated with the --pylab option, without the numpy imports, so that
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matplotlib plotting can be interactive.
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Parameters
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==========
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pretty_print: boolean
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If True, use pretty_print to stringify;
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if False, use sstrrepr to stringify.
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order: string or None
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There are a few different settings for this parameter:
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lex (default), which is lexographic order;
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grlex, which is graded lexographic order;
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grevlex, which is reversed graded lexographic order;
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old, which is used for compatibility reasons and for long expressions;
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None, which sets it to lex.
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use_unicode: boolean or None
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If True, use unicode characters;
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if False, do not use unicode characters.
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use_latex: boolean or None
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If True, use latex rendering if IPython GUI's;
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if False, do not use latex rendering.
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quiet: boolean
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If True, init_session will not print messages regarding its status;
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if False, init_session will print messages regarding its status.
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auto_symbols: boolean
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If True, IPython will automatically create symbols for you.
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If False, it will not.
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The default is False.
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auto_int_to_Integer: boolean
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If True, IPython will automatically wrap int literals with Integer, so
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that things like 1/2 give Rational(1, 2).
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If False, it will not.
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The default is False.
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ipython: boolean or None
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If True, printing will initialize for an IPython console;
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if False, printing will initialize for a normal console;
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The default is None, which automatically determines whether we are in
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an ipython instance or not.
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str_printer: function, optional, default=None
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A custom string printer function. This should mimic
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sympy.printing.sstrrepr().
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pretty_printer: function, optional, default=None
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A custom pretty printer. This should mimic sympy.printing.pretty().
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latex_printer: function, optional, default=None
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A custom LaTeX printer. This should mimic sympy.printing.latex()
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This should mimic sympy.printing.latex().
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argv: list of arguments for IPython
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See sympy.bin.isympy for options that can be used to initialize IPython.
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See Also
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========
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sympy.interactive.printing.init_printing: for examples and the rest of the parameters.
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Examples
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========
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>>> from sympy import init_session, Symbol, sin, sqrt
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>>> sin(x) #doctest: +SKIP
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NameError: name 'x' is not defined
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>>> init_session() #doctest: +SKIP
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>>> sin(x) #doctest: +SKIP
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sin(x)
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>>> sqrt(5) #doctest: +SKIP
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___
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\\/ 5
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>>> init_session(pretty_print=False) #doctest: +SKIP
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>>> sqrt(5) #doctest: +SKIP
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sqrt(5)
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>>> y + x + y**2 + x**2 #doctest: +SKIP
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x**2 + x + y**2 + y
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>>> init_session(order='grlex') #doctest: +SKIP
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>>> y + x + y**2 + x**2 #doctest: +SKIP
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x**2 + y**2 + x + y
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>>> init_session(order='grevlex') #doctest: +SKIP
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||
|
|
>>> y * x**2 + x * y**2 #doctest: +SKIP
|
||
|
|
x**2*y + x*y**2
|
||
|
|
>>> init_session(order='old') #doctest: +SKIP
|
||
|
|
>>> x**2 + y**2 + x + y #doctest: +SKIP
|
||
|
|
x + y + x**2 + y**2
|
||
|
|
>>> theta = Symbol('theta') #doctest: +SKIP
|
||
|
|
>>> theta #doctest: +SKIP
|
||
|
|
theta
|
||
|
|
>>> init_session(use_unicode=True) #doctest: +SKIP
|
||
|
|
>>> theta # doctest: +SKIP
|
||
|
|
\u03b8
|
||
|
|
"""
|
||
|
|
import sys
|
||
|
|
|
||
|
|
in_ipython = False
|
||
|
|
|
||
|
|
if ipython is not False:
|
||
|
|
try:
|
||
|
|
import IPython
|
||
|
|
except ImportError:
|
||
|
|
if ipython is True:
|
||
|
|
raise RuntimeError("IPython is not available on this system")
|
||
|
|
ip = None
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
from IPython import get_ipython
|
||
|
|
ip = get_ipython()
|
||
|
|
except ImportError:
|
||
|
|
ip = None
|
||
|
|
in_ipython = bool(ip)
|
||
|
|
if ipython is None:
|
||
|
|
ipython = in_ipython
|
||
|
|
|
||
|
|
if ipython is False:
|
||
|
|
ip = init_python_session()
|
||
|
|
mainloop = ip.interact
|
||
|
|
else:
|
||
|
|
ip = init_ipython_session(ip, argv=argv, auto_symbols=auto_symbols,
|
||
|
|
auto_int_to_Integer=auto_int_to_Integer)
|
||
|
|
|
||
|
|
if version_tuple(IPython.__version__) >= version_tuple('0.11'):
|
||
|
|
# runsource is gone, use run_cell instead, which doesn't
|
||
|
|
# take a symbol arg. The second arg is `store_history`,
|
||
|
|
# and False means don't add the line to IPython's history.
|
||
|
|
ip.runsource = lambda src, symbol='exec': ip.run_cell(src, False)
|
||
|
|
|
||
|
|
# Enable interactive plotting using pylab.
|
||
|
|
try:
|
||
|
|
ip.enable_pylab(import_all=False)
|
||
|
|
except Exception:
|
||
|
|
# Causes an import error if matplotlib is not installed.
|
||
|
|
# Causes other errors (depending on the backend) if there
|
||
|
|
# is no display, or if there is some problem in the
|
||
|
|
# backend, so we have a bare "except Exception" here
|
||
|
|
pass
|
||
|
|
if not in_ipython:
|
||
|
|
mainloop = ip.mainloop
|
||
|
|
|
||
|
|
if auto_symbols and (not ipython or version_tuple(IPython.__version__) < version_tuple('0.11')):
|
||
|
|
raise RuntimeError("automatic construction of symbols is possible only in IPython 0.11 or above")
|
||
|
|
if auto_int_to_Integer and (not ipython or version_tuple(IPython.__version__) < version_tuple('0.11')):
|
||
|
|
raise RuntimeError("automatic int to Integer transformation is possible only in IPython 0.11 or above")
|
||
|
|
|
||
|
|
_preexec_source = preexec_source
|
||
|
|
|
||
|
|
ip.runsource(_preexec_source, symbol='exec')
|
||
|
|
init_printing(pretty_print=pretty_print, order=order,
|
||
|
|
use_unicode=use_unicode, use_latex=use_latex, ip=ip,
|
||
|
|
str_printer=str_printer, pretty_printer=pretty_printer,
|
||
|
|
latex_printer=latex_printer)
|
||
|
|
|
||
|
|
message = _make_message(ipython, quiet, _preexec_source)
|
||
|
|
|
||
|
|
if not in_ipython:
|
||
|
|
print(message)
|
||
|
|
mainloop()
|
||
|
|
sys.exit('Exiting ...')
|
||
|
|
else:
|
||
|
|
print(message)
|
||
|
|
import atexit
|
||
|
|
atexit.register(lambda: print("Exiting ...\n"))
|