def test_ensure_tuple():
x1 = ('foo', ('foo', ), ['foo'], {'foo'})
assert set(map(ensure_tuple, x1)) == {('foo', )}
x2 = (pysnooper.Keys('foo'), (pysnooper.Keys('foo'), ),
[pysnooper.Keys('foo')], {pysnooper.Keys('foo')})
assert set(map(ensure_tuple, x2)) == {(pysnooper.Keys('foo'), )}
def test_variables_classes():
class WithSlots(object):
__slots__ = ('x', 'y')
def __init__(self):
self.x = 3
self.y = 4
@pysnooper.snoop(watch=(
pysnooper.Keys('_d', exclude='c'),
pysnooper.Attrs('_d'), # doesn't have attributes
pysnooper.Attrs('_s'),
pysnooper.Indices('_lst')[-3:],
))
def my_function():
_d = {'a': 1, 'b': 2, 'c': 'ignore'}
_s = WithSlots()
_lst = list(range(1000))
with mini_toolbox.OutputCapturer(stdout=False,
stderr=True) as output_capturer:
result = my_function()
assert result is None
output = output_capturer.string_io.getvalue()
assert_output(
output,
(VariableEntry('WithSlots'), CallEntry('def my_function():'),
LineEntry(), VariableEntry('_d'), VariableEntry("_d['a']", '1'),
VariableEntry("_d['b']", '2'), LineEntry(), VariableEntry('_s'),
VariableEntry('_s.x', '3'), VariableEntry('_s.y', '4'), LineEntry(),
VariableEntry('_lst'), VariableEntry('_lst[997]', '997'),
VariableEntry('_lst[998]', '998'), VariableEntry(
'_lst[999]', '999'), ReturnEntry(), ReturnValueEntry('None')))
# You can also pass a stream or a callable instead, and they'll be used.
# See values of some expressions that aren't local variables:
@pysnooper.snoop(watch=('foo.bar', 'self.x["whatever"]'))
# Expand values to see all their attributes or items of lists/dictionaries:
@pysnooper.snoop(watch_explode=('foo', 'self'))
# This will output lines like:
'''
Modified var:.. foo[2] = 'whatever'
New var:....... self.baz = 8
'''
# (see Advanced Usage for more control):
import pysnooper
@pysnooper.snoop(watch=(
pysnooper.Attrs('x'), # attributes
pysnooper.Keys('y'), # mapping (e.g. dict) items
pysnooper.Indices('z'), # sequence (e.g. list/tuple) items
))
# Show snoop lines for functions that your function calls:
@pysnooper.snoop(depth=2)
Start all snoop lines with a prefix, to grep for them easily:
@pysnooper.snoop(prefix='ZZZ ')
On multi-threaded apps identify which thread are snooped in output:
@pysnooper.snoop(thread_info=True)
PySnooper supports decorating generators.
You can also customize the repr of an object: