大约有 48,000 项符合查询结果（耗时：0.0291秒） [XML]
What's the difference between lists enclosed by square brackets and parentheses in Python?
... = {}
>>> z[x] = 3
>>> z
{(1, 2): 3}
>>> z[y] = 4
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
Note that, as many people have pointed out, you can add tuples together. For example:
>>>...
Need a simple explanation of the inject method
...sonDrew Olson
3,50933 gold badges2121 silver badges1414 bronze badges
...
Switch case with fallthrough?
...
314
Use a vertical bar (|) for "or".
case "$C" in
"1")
do_this()
;;
"2" | "3")
do_what_...
Sample random rows in dataframe
...
460
First make some data:
> df = data.frame(matrix(rnorm(20), nrow=10))
> df
X1 ...
How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
...|
edited May 23 '17 at 11:47
Community♦
111 silver badge
answered Sep 29 '09 at 0:23
...
How to overcome TypeError: unhashable type: 'list'
...split('x')"
– Keenan
Dec 3 '12 at 0:43
1
@user1871081 Ah, are you using Python 3.x? I'll post an ...
Difference between '..' (double-dot) and '…' (triple-dot) in range generation?
...e?(5) #=> true
(1...5).include?(5) #=> false
(1..4).include?(4.1) #=> false
(1...5).include?(4.1) #=> true
(1..4).to_a == (1...5).to_a #=> true
(1..4) == (1...5) #=> false
†The docs used to not include this, instead requiring read...
How to delete an element from an array in C#
...
342
If you want to remove all instances of 4 without needing to know the index:
LINQ: (.NET Framew...