Miscellaneous¶
Miscellaneous stuff that doesn’t really fit anywhere else.
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sympy.utilities.misc.
debug_decorator
(func)[source]¶ If SYMPY_DEBUG is True, it will print a nice execution tree with arguments and results of all decorated functions, else do nothing.
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sympy.utilities.misc.
filldedent
(s, w=70)[source]¶ Strips leading and trailing empty lines from a copy of \(s\), then dedents, fills and returns it.
Empty line stripping serves to deal with docstrings like this one that start with a newline after the initial triple quote, inserting an empty line at the beginning of the string.
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sympy.utilities.misc.
find_executable
(executable, path=None)[source]¶ Try to find ‘executable’ in the directories listed in ‘path’ (a string listing directories separated by ‘os.pathsep’; defaults to os.environ[‘PATH’]). Returns the complete filename or None if not found
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sympy.utilities.misc.
func_name
(x, short=False)[source]¶ Return function name of \(x\) (if defined) else the \(type(x)\). If short is True and there is a shorter alias for the result, return the alias.
Examples
>>> from sympy.utilities.misc import func_name >>> from sympy import Matrix >>> from sympy.abc import x >>> func_name(Matrix.eye(3)) 'MutableDenseMatrix' >>> func_name(x < 1) 'StrictLessThan' >>> func_name(x < 1, short=True) 'Lt'
See also
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sympy.utilities.misc.
rawlines
(s)[source]¶ Return a cut-and-pastable string that, when printed, is equivalent to the input. Use this when there is more than one line in the string. The string returned is formatted so it can be indented nicely within tests; in some cases it is wrapped in the dedent function which has to be imported from textwrap.
Examples
Note: because there are characters in the examples below that need to be escaped because they are themselves within a triple quoted docstring, expressions below look more complicated than they would be if they were printed in an interpreter window.
>>> from sympy.utilities.misc import rawlines >>> from sympy import TableForm >>> s = str(TableForm([[1, 10]], headings=(None, ['a', 'bee']))) >>> print(rawlines(s)) ( 'a bee\n' '-----\n' '1 10 ' ) >>> print(rawlines('''this ... that''')) dedent('''\ this that''')
>>> print(rawlines('''this ... that ... ''')) dedent('''\ this that ''')
>>> s = """this ... is a triple ''' ... """ >>> print(rawlines(s)) dedent("""\ this is a triple ''' """)
>>> print(rawlines('''this ... that ... ''')) ( 'this\n' 'that\n' ' ' )
See also
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sympy.utilities.misc.
replace
(string, *reps)[source]¶ Return
string
with all keys inreps
replaced with their corresponding values, longer strings first, irrespective of the order they are given.reps
may be passed as tuples or a single mapping.Examples
>>> from sympy.utilities.misc import replace >>> replace('foo', {'oo': 'ar', 'f': 'b'}) 'bar' >>> replace("spamham sha", ("spam", "eggs"), ("sha","md5")) 'eggsham md5'
There is no guarantee that a unique answer will be obtained if keys in a mapping overlap (i.e. are the same length and have some identical sequence at the beginning/end):
>>> reps = [ ... ('ab', 'x'), ... ('bc', 'y')] >>> replace('abc', *reps) in ('xc', 'ay') True
References
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sympy.utilities.misc.
strlines
(s, c=64, short=False)[source]¶ Return a cut-and-pastable string that, when printed, is equivalent to the input. The lines will be surrounded by parentheses and no line will be longer than c (default 64) characters. If the line contains newlines characters, the \(rawlines\) result will be returned. If
short
is True (default is False) then if there is one line it will be returned without bounding parentheses.Examples
>>> from sympy.utilities.misc import strlines >>> q = 'this is a long string that should be broken into shorter lines' >>> print(strlines(q, 40)) ( 'this is a long string that should be b' 'roken into shorter lines' ) >>> q == ( ... 'this is a long string that should be b' ... 'roken into shorter lines' ... ) True
See also
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sympy.utilities.misc.
translate
(s, a, b=None, c=None)[source]¶ Return
s
where characters have been replaced or deleted.Syntax
- translate(s, None, deletechars):
all characters in
deletechars
are deleted- translate(s, map [,deletechars]):
all characters in
deletechars
(if provided) are deleted then the replacements defined by map are made; if the keys of map are strings then the longer ones are handled first. Multicharacter deletions should have a value of ‘’.- translate(s, oldchars, newchars, deletechars)
all characters in
deletechars
are deleted then each character inoldchars
is replaced with the corresponding character innewchars
Examples
>>> from sympy.utilities.misc import translate >>> from sympy.core.compatibility import unichr >>> abc = 'abc' >>> translate(abc, None, 'a') 'bc' >>> translate(abc, {'a': 'x'}, 'c') 'xb' >>> translate(abc, {'abc': 'x', 'a': 'y'}) 'x'
>>> translate('abcd', 'ac', 'AC', 'd') 'AbC'
There is no guarantee that a unique answer will be obtained if keys in a mapping overlap are the same length and have some identical sequences at the beginning/end:
>>> translate(abc, {'ab': 'x', 'bc': 'y'}) in ('xc', 'ay') True