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Hashing a file in Python
...pisti points out, we gotta deal with those bigger files in chunks!
import sys
import hashlib
# BUF_SIZE is totally arbitrary, change for your app!
BUF_SIZE = 65536 # lets read stuff in 64kb chunks!
md5 = hashlib.md5()
sha1 = hashlib.sha1()
with open(sys.argv[1], 'rb') as f:
while True:
...
How to compare two NSDates: Which is more recent?
...
Late to the party, but another easy way of comparing NSDate objects is to convert them into primitive types which allows for easy use of '>' '<' '==' etc
eg.
if ([dateA timeIntervalSinceReferenceDate] > [dateB timeIntervalSinceReferenceDate]) {
//do stuff
}
timeIntervalSinceReferen...
How do I calculate tables size in Oracle
..._rows*avg_row_len)/(1024*1024)) MB
from all_tables
where owner not like 'SYS%' -- Exclude system tables.
and num_rows > 0 -- Ignore empty Tables.
order by MB desc -- Biggest first.
;
--Tables + Rows
select owner, table_name, num_rows
from all_tables
where owner not like 'SYS%' -- Exclude...
Check if OneToOneField is None in Django
...on 3.4, Django 1.9.2, and SQLite3 3.8.2.
# Tested with Django 1.9.2
import sys
import django
from django.apps import apps
from django.apps.config import AppConfig
from django.conf import settings
from django.core.exceptions import ObjectDoesNotExist
from django.db import connections, models, DEFAUL...
Initializing a static std::map in C++
...the following way (since C++17):
// Example
template<>
class StringConverter<CacheMode> final
{
public:
static auto convert(CacheMode mode) -> const std::string&
{
// validate...
return s_modes.at(mode);
}
private:
static inline const std::map<...
How can I get the DateTime for the start of the week?
...16:00:00Z which is Mon, 03 Sep 2012 00:00:00 in local time. So it needs to convert dt to local time or do something a bit smarter. It would also need to return the result as UTC if the input was UTC.
– row1
Sep 6 '12 at 4:12
...
tcp加速技术解决方案 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...
RPS就会选择特定的cpu做协议栈处理， 映射关系可以通过/sys/class/net//queues/rx-/rps_cpus来配置。 但是RPS并不清楚应用程序在哪个cpu上。
RFS（Receive Flow Steering）：RFS是在RPS的基础上， 解决了RPS的问题。 当应用程序调用recvmsg的时候...
What method in the String class returns only the first N characters?
... that the LINQ version returns a IEnumerable<char>, so you'd have to convert the IEnumerable<char> to string: new string(s.Take(n).ToArray()).
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What is “vectorization”?
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Vectorization is the term for converting a scalar program to a vector program. Vectorized programs can run multiple operations from a single instruction, whereas scalar can only operate on pairs of operands at once.
From wikipedia:
Scalar approach:
for...
Seeking clarification on apparent contradictions regarding weakly typed languages
...ping I end up finding examples of programming languages that simply coerce/convert types automatically.
9 Answers
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