/usr/lib/python2.7/dist-packages/sympy/abc.py is in python-sympy 0.7.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | from __future__ import print_function, division
import string
from .core import Symbol
from .core.alphabets import greeks
from .core.compatibility import exec_
_latin = list(string.ascii_letters)
# COSINEQ should not be imported as they clash; gamma, pi and zeta clash, too
_greek = list(greeks) # make a copy, so we can mutate it
# Note: We import lamda since lambda is a reserved keyword in Python
_greek.remove("lambda")
_greek.append("lamda")
for _s in _latin + _greek:
exec_("%s = Symbol('%s')" % (_s, _s))
def clashing():
"""Return the clashing-symbols dictionaries.
``clash1`` defines all the single letter variables that clash with
SymPy objects; ``clash2`` defines the multi-letter clashing symbols;
and ``clash`` is the union of both. These can be passed for ``locals``
during sympification if one desires Symbols rather than the non-Symbol
objects for those names.
Examples
========
>>> from sympy import S
>>> from sympy.abc import _clash1, _clash2, _clash
>>> S("Q & C", locals=_clash1)
And(C, Q)
>>> S('pi(x)', locals=_clash2)
pi(x)
>>> S('pi(C, Q)', locals=_clash)
pi(C, Q)
Note: if changes are made to the docstring examples they can only
be tested after removing "clashing" from the list of deleted items
at the bottom of this file which removes this function from the
namespace.
"""
ns = {}
exec_('from sympy import *', ns)
clash1 = {}
clash2 = {}
while ns:
k, _ = ns.popitem()
if k in _greek:
clash2[k] = Symbol(k)
_greek.remove(k)
elif k in _latin:
clash1[k] = Symbol(k)
_latin.remove(k)
clash = {}
clash.update(clash1)
clash.update(clash2)
return clash1, clash2, clash
_clash1, _clash2, _clash = clashing()
del _latin, _greek, _s, clashing, Symbol
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