def __add__(self, expr):
"""
Adds `expr` to pattern.
::
>>> pattern = patterntools.Pseq([1, 2, 3])
>>> expr = patterntools.Pseq([0, 10])
>>> list(pattern + expr)
[1, 12]
::
>>> expr = 10
>>> list(pattern + expr)
[11, 12, 13]
::
>>> expr = [10, [100, 1000]]
>>> list(pattern + expr)
[[11, [101, 1001]], [12, [102, 1002]], [13, [103, 1003]]]
::
>>> pattern = patterntools.Pseq([[1, [2, 3]], [[4, 5], 6, 7]])
>>> expr = [10, [100, 1000]]
>>> for x in (pattern + expr):
... x
...
[11, [102, 1003]]
[[14, 15], [106, 1006], 17]
"""
from supriya.tools import patterntools
return patterntools.Pbinop(self, '+', expr)
def __sub__(self, expr):
from supriya.tools import patterntools
return patterntools.Pbinop(self, '-', expr)
def __rmul__(self, expr):
from supriya.tools import patterntools
return patterntools.Pbinop(expr, '*', self)
