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How can I count the occurrences of a list item?
...ions import Counter;n=1000;l=[random.choice(string.ascii_letters) for x in range(n)]'
)
t2=timeit.Timer('[[x,l.count(x)] for x in set(l)]',
'import random;import string;n=1000;l=[random.choice(string.ascii_letters) for x in range(n)]'
)
print("Counte...
'Static readonly' vs. 'const'
...t, and provided that the C# compiler verifies that its value is within the range of a short (which 42 is). See Implicit constant expression conversions in the C# Language Specification. So both overloads have to be considered. The overload Equals(short) is preferred (any short is an object, but not ...
How to flatten only some dimensions of a numpy array
...
A slight generalization to Peter's answer -- you can specify a range over the original array's shape if you want to go beyond three dimensional arrays.
e.g. to flatten all but the last two dimensions:
arr = numpy.zeros((3, 4, 5, 6))
new_arr = arr.reshape(-1, *arr.shape[-2:])
new_arr.sh...
Calculate MD5 checksum for a file
...oiner" and a Unicode "zero width space"--between the "empty" quotes in the raw HTML. I don't know if it was in the original comment or if SO is to blame here.
– Chris Simmons
Jan 19 '17 at 16:17
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How does Java handle integer underflows and overflows and how would you check for it?
...type to actually perform the operation and check if the result is still in range for the source type:
public int addWithOverflowCheck(int a, int b) {
// the cast of a is required, to make the + work with long precision,
// if we just added (a + b) the addition would use int precision and
...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...。
4. 进程的系统调用记数统计
bpftrace -e 'tracepoint:raw_syscalls:sys_enter { @[comm] = count(); }'
Attaching 1 probe...
^C
@[bpftrace]: 6
@[systemd]: 24
@[snmp-pass]: 96
@[sshd]: 125
按Ctrl-C后打印进程的系统调用计数。
@: 表示一种特殊的变量...
Why does Java's hashCode() in String use 31 as a multiplier?
...any kind of international charset with common characters outside the ASCII range. At least, I checked this for 31 and German. So I think the choice of 31 is broken.
– Hans-Peter Störr
May 11 '10 at 6:58
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Using Git, show all commits that are in one branch, but not the other(s)
...tration https://git-scm.com/book/en/v2/Git-Tools-Revision-Selection#Commit-Ranges
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Why should I prefer to use member initialization lists?
...uch difference the member initialization list can mak. In the leetcode 303 Range Sum Query - Immutable, https://leetcode.com/problems/range-sum-query-immutable/, where you need to construct and initialize to zero a vector with certain size. Here is two different implementation and speed comparison.
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How do you set a default value for a MySQL Datetime column?
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it's important to note that datetime has a range of 1000-9999, but the range for timestamp is only 1970-2038. this can be a problem if your system has to store birthdates, or you have to handle something like the payment plan for a 30-year mortgage. dev.mysql.com/doc/...