大约有 9,800 项符合查询结果（耗时：0.0124秒） [XML]
Python: reload component Y imported with 'from X import Y'?
...at I can tell the correct answer is:
from importlib import reload # python 2.7 does not require this
import X
reload( X )
from X import Y
Test
My test was the following (Python 2.6.5 + bpython 0.9.5.2)
X.py:
def Y():
print "Test 1"
bpython:
>>> from X import Y
>>> print Y()
...
Convert string to Python class object?
...
You want the class Baz, which lives in module foo.bar. With Python 2.7,
you want to use importlib.import_module(), as this will make transitioning to Python 3 easier:
import importlib
def class_for_name(module_name, class_name):
# load the module, will raise ImportError if module cann...
python: how to identify if a variable is an array or a scalar
... i've actually upvoted, but then realized that it deosn't work in 2.7:>>> p=[] >>> type(p) in (list) Traceback (most recent call last): File "<stdin>", line 1, in <module>
– Oleg Gryb
Jun 12 '14 at 1:14
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How to get week number in Python?
... [...]
(Added in Python 3.6, backported to some distribution's Python 2.7's) Several additional directives not required by the C89 standard are included for convenience. These parameters all correspond to ISO 8601 date values. These may not be available on all platforms when used with the strft...
Transpose list of lists
...a *args: args, *list_list)))
[[1, 4, 7], [2, 5, 8], [3, 6, 9]] // Python 2.7
[[1, 4, 7], [2, 5, 8], [3, 6, 9], [None, 6.1, None], [None, 6.2, None], [None, 6.3, None]] // 3.6+
Alas the ragged rows do NOT become ragged columns in Python 3, they are just truncated. Boo hoo progress.
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How does Python manage int and long?
...int contains the maximum value a Python int can hold.
On a 64-bit Python 2.7, the size is 24 bytes. Check with sys.getsizeof().
Python 3: sys.maxsize contains the maximum size in bytes a Python int can be.
This will be gigabytes in 32 bits, and exabytes in 64 bits.
Such a large int would have a...
How to assert two list contain the same elements in Python? [duplicate]
...]
In Python >= 3.0
assertCountEqual(l1, l2) # True
In Python >= 2.7, the above function was named:
assertItemsEqual(l1, l2) # True
In Python < 2.7
import unittest2
assertItemsEqual(l1, l2) # True
Via six module (Any Python version)
import unittest
import six
class MyTest(unittes...
Zip lists in Python
...
In Python 2.7 this might have worked fine:
>>> a = b = c = range(20)
>>> zip(a, b, c)
But in Python 3.4 it should be (otherwise, the result will be something like <zip object at 0x00000256124E7DC8>):
>>...
How to avoid “RuntimeError: dictionary changed size during iteration” error?
... {k: v for k,v in d.iteritems() if v} # re-bind to non-empty
If prior to 2.7:
d = dict( (k, v) for k,v in d.iteritems() if v )
or just:
empty_key_vals = list(k for k in k,v in d.iteritems() if v)
for k in empty_key_vals:
del[k]
...
Better way to shuffle two numpy arrays in unison
...ginal function: my original takes ~1.8s for 10 iterations, and this takes ~2.7s. Both numbers are quite consistent. The dataset I used to test has a.shape is (31925, 405) and b.shape is (31925,).
– Josh Bleecher Snyder
Jan 5 '11 at 17:46
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