Source code for sympy.printing.tree
from __future__ import print_function, division
[docs]def pprint_nodes(subtrees):
"""
Prettyprints systems of nodes.
Examples
========
>>> from sympy.printing.tree import pprint_nodes
>>> print(pprint_nodes(["a", "b1\\nb2", "c"]))
+-a
+-b1
| b2
+-c
"""
def indent(s, type=1):
x = s.split("\n")
r = "+-%s\n" % x[0]
for a in x[1:]:
if a == "":
continue
if type == 1:
r += "| %s\n" % a
else:
r += " %s\n" % a
return r
if not subtrees:
return ""
f = ""
for a in subtrees[:-1]:
f += indent(a)
f += indent(subtrees[-1], 2)
return f
[docs]def print_node(node):
"""
Returns information about the "node".
This includes class name, string representation and assumptions.
"""
s = "%s: %s\n" % (node.__class__.__name__, str(node))
d = node._assumptions
if d:
for a in sorted(d):
v = d[a]
if v is None:
continue
s += "%s: %s\n" % (a, v)
return s
[docs]def tree(node):
"""
Returns a tree representation of "node" as a string.
It uses print_node() together with pprint_nodes() on node.args recursively.
See Also
========
print_tree
"""
subtrees = []
for arg in node.args:
subtrees.append(tree(arg))
s = print_node(node) + pprint_nodes(subtrees)
return s
[docs]def print_tree(node):
"""
Prints a tree representation of "node".
Examples
========
>>> from sympy.printing import print_tree
>>> from sympy import Symbol
>>> x = Symbol('x', odd=True)
>>> y = Symbol('y', even=True)
>>> print_tree(y**x)
Pow: y**x
+-Symbol: y
| algebraic: True
| commutative: True
| complex: True
| even: True
| hermitian: True
| imaginary: False
| integer: True
| irrational: False
| noninteger: False
| odd: False
| rational: True
| real: True
| transcendental: False
+-Symbol: x
algebraic: True
commutative: True
complex: True
even: False
hermitian: True
imaginary: False
integer: True
irrational: False
noninteger: False
nonzero: True
odd: True
rational: True
real: True
transcendental: False
zero: False
See Also
========
tree
"""
print(tree(node))
