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343 lines
11 KiB
343 lines
11 KiB
5 months ago
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"""
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Python shell for SymPy.
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This is just a normal Python shell (IPython shell if you have the
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IPython package installed), that executes the following commands for
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the user:
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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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So starting 'isympy' is equivalent to starting Python (or IPython) and
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executing the above commands by hand. It is intended for easy and quick
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experimentation with SymPy. isympy is a good way to use SymPy as an
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interactive calculator. If you have IPython and Matplotlib installed, then
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interactive plotting is enabled by default.
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COMMAND LINE OPTIONS
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--------------------
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-c CONSOLE, --console=CONSOLE
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Use the specified shell (Python or IPython) shell as the console
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backend instead of the default one (IPython if present, Python
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otherwise), e.g.:
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$isympy -c python
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CONSOLE must be one of 'ipython' or 'python'
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-p PRETTY, --pretty PRETTY
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Setup pretty-printing in SymPy. When pretty-printing is enabled,
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expressions can be printed with Unicode or ASCII. The default is
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to use pretty-printing (with Unicode if the terminal supports it).
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When this option is 'no', expressions will not be pretty-printed
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and ASCII will be used:
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$isympy -p no
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PRETTY must be one of 'unicode', 'ascii', or 'no'
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-t TYPES, --types=TYPES
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Setup the ground types for the polys. By default, gmpy ground types
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are used if gmpy2 or gmpy is installed, otherwise it falls back to python
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ground types, which are a little bit slower. You can manually
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choose python ground types even if gmpy is installed (e.g., for
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testing purposes):
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$isympy -t python
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TYPES must be one of 'gmpy', 'gmpy1' or 'python'
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Note that the ground type gmpy1 is primarily intended for testing; it
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forces the use of gmpy version 1 even if gmpy2 is available.
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This is the same as setting the environment variable
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SYMPY_GROUND_TYPES to the given ground type (e.g.,
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SYMPY_GROUND_TYPES='gmpy')
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The ground types can be determined interactively from the variable
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sympy.polys.domains.GROUND_TYPES.
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-o ORDER, --order ORDER
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Setup the ordering of terms for printing. The default is lex, which
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orders terms lexicographically (e.g., x**2 + x + 1). You can choose
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other orderings, such as rev-lex, which will use reverse
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lexicographic ordering (e.g., 1 + x + x**2):
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$isympy -o rev-lex
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ORDER must be one of 'lex', 'rev-lex', 'grlex', 'rev-grlex',
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'grevlex', 'rev-grevlex', 'old', or 'none'.
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Note that for very large expressions, ORDER='none' may speed up
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printing considerably but the terms will have no canonical order.
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-q, --quiet
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Print only Python's and SymPy's versions to stdout at startup.
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-d, --doctest
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Use the same format that should be used for doctests. This is
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equivalent to -c python -p no.
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-C, --no-cache
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Disable the caching mechanism. Disabling the cache may slow certain
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operations down considerably. This is useful for testing the cache,
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or for benchmarking, as the cache can result in deceptive timings.
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This is equivalent to setting the environment variable
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SYMPY_USE_CACHE to 'no'.
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-a, --auto-symbols (requires at least IPython 0.11)
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Automatically create missing symbols. Normally, typing a name of a
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Symbol that has not been instantiated first would raise NameError,
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but with this option enabled, any undefined name will be
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automatically created as a Symbol.
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Note that this is intended only for interactive, calculator style
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usage. In a script that uses SymPy, Symbols should be instantiated
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at the top, so that it's clear what they are.
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This will not override any names that are already defined, which
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includes the single character letters represented by the mnemonic
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QCOSINE (see the "Gotchas and Pitfalls" document in the
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documentation). You can delete existing names by executing "del
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name". If a name is defined, typing "'name' in dir()" will return True.
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The Symbols that are created using this have default assumptions.
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If you want to place assumptions on symbols, you should create them
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using symbols() or var().
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Finally, this only works in the top level namespace. So, for
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example, if you define a function in isympy with an undefined
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Symbol, it will not work.
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See also the -i and -I options.
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-i, --int-to-Integer (requires at least IPython 0.11)
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Automatically wrap int literals with Integer. This makes it so that
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things like 1/2 will come out as Rational(1, 2), rather than 0.5. This
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works by preprocessing the source and wrapping all int literals with
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Integer. Note that this will not change the behavior of int literals
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assigned to variables, and it also won't change the behavior of functions
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that return int literals.
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If you want an int, you can wrap the literal in int(), e.g. int(3)/int(2)
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gives 1.5 (with division imported from __future__).
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-I, --interactive (requires at least IPython 0.11)
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This is equivalent to --auto-symbols --int-to-Integer. Future options
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designed for ease of interactive use may be added to this.
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-D, --debug
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Enable debugging output. This is the same as setting the
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environment variable SYMPY_DEBUG to 'True'. The debug status is set
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in the variable SYMPY_DEBUG within isympy.
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-- IPython options
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Additionally you can pass command line options directly to the IPython
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interpreter (the standard Python shell is not supported). However you
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need to add the '--' separator between two types of options, e.g the
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startup banner option and the colors option. You need to enter the
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options as required by the version of IPython that you are using, too:
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in IPython 0.11,
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$isympy -q -- --colors=NoColor
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or older versions of IPython,
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$isympy -q -- -colors NoColor
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See also isympy --help.
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"""
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import os
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import sys
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# DO NOT IMPORT SYMPY HERE! Or the setting of the sympy environment variables
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# by the command line will break.
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def main() -> None:
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from argparse import ArgumentParser, RawDescriptionHelpFormatter
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VERSION = None
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if '--version' in sys.argv:
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# We cannot import sympy before this is run, because flags like -C and
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# -t set environment variables that must be set before SymPy is
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# imported. The only thing we need to import it for is to get the
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# version, which only matters with the --version flag.
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import sympy
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VERSION = sympy.__version__
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usage = 'isympy [options] -- [ipython options]'
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parser = ArgumentParser(
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usage=usage,
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description=__doc__,
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formatter_class=RawDescriptionHelpFormatter,
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)
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parser.add_argument('--version', action='version', version=VERSION)
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parser.add_argument(
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'-c', '--console',
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dest='console',
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action='store',
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default=None,
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choices=['ipython', 'python'],
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metavar='CONSOLE',
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help='select type of interactive session: ipython | python; defaults '
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'to ipython if IPython is installed, otherwise python')
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parser.add_argument(
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'-p', '--pretty',
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dest='pretty',
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action='store',
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default=None,
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metavar='PRETTY',
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choices=['unicode', 'ascii', 'no'],
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help='setup pretty printing: unicode | ascii | no; defaults to '
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'unicode printing if the terminal supports it, otherwise ascii')
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parser.add_argument(
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'-t', '--types',
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dest='types',
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action='store',
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default=None,
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metavar='TYPES',
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choices=['gmpy', 'gmpy1', 'python'],
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help='setup ground types: gmpy | gmpy1 | python; defaults to gmpy if gmpy2 '
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'or gmpy is installed, otherwise python')
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parser.add_argument(
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'-o', '--order',
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dest='order',
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action='store',
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default=None,
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metavar='ORDER',
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choices=['lex', 'grlex', 'grevlex', 'rev-lex', 'rev-grlex', 'rev-grevlex', 'old', 'none'],
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help='setup ordering of terms: [rev-]lex | [rev-]grlex | [rev-]grevlex | old | none; defaults to lex')
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parser.add_argument(
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'-q', '--quiet',
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dest='quiet',
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action='store_true',
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default=False,
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help='print only version information at startup')
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parser.add_argument(
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'-d', '--doctest',
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dest='doctest',
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action='store_true',
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default=False,
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help='use the doctest format for output (you can just copy and paste it)')
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parser.add_argument(
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'-C', '--no-cache',
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dest='cache',
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action='store_false',
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default=True,
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help='disable caching mechanism')
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parser.add_argument(
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'-a', '--auto-symbols',
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dest='auto_symbols',
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action='store_true',
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default=False,
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help='automatically construct missing symbols')
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parser.add_argument(
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'-i', '--int-to-Integer',
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dest='auto_int_to_Integer',
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action='store_true',
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default=False,
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help="automatically wrap int literals with Integer")
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parser.add_argument(
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'-I', '--interactive',
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dest='interactive',
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action='store_true',
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default=False,
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help="equivalent to -a -i")
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parser.add_argument(
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'-D', '--debug',
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dest='debug',
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action='store_true',
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default=False,
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help='enable debugging output')
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(options, ipy_args) = parser.parse_known_args()
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if '--' in ipy_args:
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ipy_args.remove('--')
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if not options.cache:
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os.environ['SYMPY_USE_CACHE'] = 'no'
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if options.types:
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os.environ['SYMPY_GROUND_TYPES'] = options.types
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if options.debug:
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os.environ['SYMPY_DEBUG'] = str(options.debug)
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if options.doctest:
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options.pretty = 'no'
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options.console = 'python'
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session = options.console
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if session is not None:
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ipython = session == 'ipython'
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else:
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try:
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import IPython
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ipython = True
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except ImportError:
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if not options.quiet:
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from sympy.interactive.session import no_ipython
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print(no_ipython)
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ipython = False
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args = {
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'pretty_print': True,
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'use_unicode': None,
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'use_latex': None,
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'order': None,
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'argv': ipy_args,
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}
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if options.pretty == 'unicode':
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args['use_unicode'] = True
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elif options.pretty == 'ascii':
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args['use_unicode'] = False
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elif options.pretty == 'no':
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args['pretty_print'] = False
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if options.order is not None:
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args['order'] = options.order
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args['quiet'] = options.quiet
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args['auto_symbols'] = options.auto_symbols or options.interactive
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args['auto_int_to_Integer'] = options.auto_int_to_Integer or options.interactive
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from sympy.interactive import init_session
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init_session(ipython, **args)
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if __name__ == "__main__":
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main()
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