大约有 667 项符合查询结果（耗时：0.0228秒） [XML]
UnboundLocalError on local variable when reassigned after first use
The following code works as expected in both Python 2.5 and 3.0:
12 Answers
12
...
Lambda function in list comprehensions
... by name (as a keyword argument to partial). Let's do some renaming:
After 2.5:
>>> a = [partial(lambda coef, x: coef * x, coef=i) for i in (1, 2)]
>>> a[0](1)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: <lambda>() got multi...
Draw radius around a point in Google map
...w google.maps.Marker({
map: map,
position: new google.maps.LatLng(53, -2.5),
title: 'Some location'
});
// Add circle overlay and bind to marker
var circle = new google.maps.Circle({
map: map,
radius: 16093, // 10 miles in metres
fillColor: '#AA0000'
});
circle.bindTo('center', marke...
Git Extensions: Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0
...f memory for its heap at this fixed address 0x68570000, while only a hole ~2.5 MB large was apparently available there. The relevant code can be seen in msysgit source.
Why is that part of address space not free?
There can be many reasons. In my case it was some other modules loaded at a conflic...
How do I create a namespace package in Python?
...a non-issue, though. Quick googling reveals that pkgutil was introduced in 2.5 and pkg_resources predates it. Nevertheless, pkgutil is a oficially-recognized solution. pkg_resources inclusion was, in fact, rejected in PEP 365.
– Mike Hordecki
Nov 4 '09 at 21:17...
setup.py examples?
...g Language :: Python :: 2.4',
'Programming Language :: Python :: 2.5',
'Programming Language :: Python :: 2.6',
'Programming Language :: Python :: 2.7',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.2',
'Progra...
Why does Math.round(0.49999999999999994) return 1?
...999999999999 rounded is 4
3.5 rounded is 4
3.4999999999999996 rounded is 3
2.5 rounded is 3
2.4999999999999996 rounded is 2
1.5 rounded is 2
1.4999999999999998 rounded is 1
0.5 rounded is 1
0.49999999999999994 rounded is 0
...
Preserving signatures of decorated functions
... Computes x*y + 2*z
functools.wraps() is available at least since Python 2.5 but it does not preserve the signature there:
help(funny_function)
# Help on function funny_function in module __main__:
#
# funny_function(*args, **kwargs)
# Computes x*y + 2*z
Notice: *args, **kwargs instead of x,...
GroupBy pandas DataFrame and select most common value
... Definitely the way to go for large DataFrames. I had 83M rows and 2.5M unique groups. This took 28 seconds per column, while the agg took over 11 minutes per column.
– ALollz
Apr 10 '18 at 4:15
...
Why isn't Python very good for functional programming? [closed]
... have a lambda with an If inside it. (This is fixed by ternaries in Python 2.5, but it looks ugly.)
Guido threatens to remove map, filter, and reduce every once in a while
On the other hand, python has lexical closures, Lambdas, and list comprehensions (which are really a "functional" concept whet...