大约有 12,000 项符合查询结果（耗时：0.0403秒） [XML]
How can I capitalize the first letter of each word in a string?
...letters without altering the capitalization of the rest of the words (e.g. Foo becomes foo, but FOO becomes fOO). This was perfect.
– TomNysetvold
May 23 '12 at 15:13
2
...
What does ** (double star/asterisk) and * (star/asterisk) do for parameters?
...ntation.
The *args will give you all function parameters as a tuple:
def foo(*args):
for a in args:
print(a)
foo(1)
# 1
foo(1,2,3)
# 1
# 2
# 3
The **kwargs will give you all
keyword arguments except for those corresponding to a formal parameter as a dictionary.
def bar(**...
Accessing class variables from a list comprehension in the class definition
... a class method referred to x as a nested scope variable, then manipulates Foo.x as well, for example? More importantly, what would that mean for subclasses of Foo? Python has to treat a class scope differently as it is very different from a function scope.
Last, but definitely not least, the linke...
JavaScript function order: why does it matter?
...re's some examples.
bar(); //This won't throw an error
function bar() {}
foo(); //This will throw an error
var foo = function() {}
bar();
function bar() {
foo(); //This will throw an error
}
var foo = function() {}
bar();
function bar() {
foo(); //This _won't_ throw an error
}
func...
Understanding repr( ) function in Python
...
>>> x = 'foo'
>>> x
'foo'
So the name x is attached to 'foo' string. When you call for example repr(x) the interpreter puts 'foo' instead of x and then calls repr('foo').
>>> repr(x)
"'foo'"
>>> x.__repr_...
How are virtual functions and vtable implemented?
...
I agree that it would be foolish for any compiler that takes itself seriously to use a vtable when no virtual functions exist. However, I felt it important to point out that, to my knowledge, the C++ standard does not /require/ it, so be warned befor...
Why does Clojure have “keywords” in addition to “symbols”?
...u can use a double-colon to make a namespace-qualified keyword.
user> :foo
:foo
user> ::foo
:user/foo
Common Lisp has keywords, as do Ruby and other languages. They are slightly different in those languages of course. Some differences between Common Lisp keywords and Clojure keywords:
K...
How to sort git tags by version string order of form rc-X.Y.Z.W?
...
Prepend "-" to reverse sort order.
So, if you have:
git tag foo1.3 &&
git tag foo1.6 &&
git tag foo1.10
Here is what you would get:
# lexical sort
git tag -l --sort=refname "foo*"
foo1.10
foo1.3
foo1.6
# version sort
git tag -l --sort=version:refname "foo*"
foo1.3
...
What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...races ($var vs. ${var})
In most cases, $var and ${var} are the same:
var=foo
echo $var
# foo
echo ${var}
# foo
The braces are only needed to resolve ambiguity in expressions:
var=foo
echo $varbar
# Prints nothing because there is no variable 'varbar'
echo ${var}bar
# foobar
Quotes ($var vs. "...
What is the Python equivalent of static variables inside a function?
...
A bit reversed, but this should work:
def foo():
foo.counter += 1
print "Counter is %d" % foo.counter
foo.counter = 0
If you want the counter initialization code at the top instead of the bottom, you can create a decorator:
def static_vars(**kwargs):
d...