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Mastering Development

unsupported operand type(s) for +=: ‘method’ and ‘int’

I don’t know why but getting the TypeError: unsupported operand type(s) for +=: ‘method’ and ‘int’ class Person: count_instance = 0 def __init__(self,first,last,age): Person.count_instance +=1 self.first = first self.last = last self.age = age @classmethod def count_instance(cls): return f"You have created {cls.count_instance} instances of {cls.__name__} class" def full_name(self): return f"{self.first} {self.last}" def is_above_18(self): return self.age>18 […]

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Mastering Development

How to use a template class as a type parameter for the same template class

I’m trying to instantiate a template class using an instantiation of the same template class as the type. Previous answers using an instantiation of a different template class suggest that this code should work: #include <stdio.h> #include <typeinfo> template <class T> class pair { private: T first; T second; public: pair(T x, T y) { […]

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Mastering Development

Determine WAV Duration Time in Visual Studio 2019

First, Thank You for considering my question. I have searched for a solution to this problem, and have not found anything that makes use of the modern Visual Studio features/libraries/namespaces, etc… I need to determine the duration (length of time) of a WAV audio file. I would like to get the results in milliseconds – […]

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Database Development

sp_BlitzFirst – option to save more than only SQL Server PerfMon stats?

First, I can’t say enough good things about the FirstResponders kit. It’s my "Go To" anytime something seems funny on the SQL servers. I’m also using sp_BlitzFirst to capture data to tables for my own reporting. Q: For Perfmon stats from sp_BlitzFirst, is there an option or parameter to capture additional perfmon stats? I’m thinking […]

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Mastering Development

pandas.DataFrame.append is adding new columns to dataframe in python

First, I created a csv file from data0 as shown: data0 = ["car", 0.82, 0.0026, 0.914, 0.59] test_df = pd.DataFrame([data0]) test_df.to_csv("testfile1.csv") Output of that "testfile1.csv" appears like this: 0 1 2 3 4 0 car 0.82 0.0026 0.914 0.59 I want to append new data (data1 = ["bus", 0.9, 0.123, 12.907, 42], data2 = ["van", […]

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Ask Biology

Why are we a unique species?

First, an introduction. Many people think that we cannot be alone in the universe, and some of them think also that somewhere a very advanced society exists. For the most acculturated of you, some think about the so-called Fermi paradox, which tries to answer the question "where are all the aliens?". But in our planet […]

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Arduino Ask Engineering

Read & write on Winbond SPI flash using Arduino UNO

Recently I have brought a original UNO for modifying and flashing various types of bios. I had a dedicated one click bios programmer which was very expensive but few days ago it failed. So I thought it is a good opportunity to learn how bios works in details. After searching on google, I saw people […]

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Ask Electrical Engineering Engineering

base impedance of a bjt amplifier

I am currently reading Malvino’s book as my text book. As stated in the picture "At low frequency (maybe DC) this impedance is purely resistive and defined as ….", I am not able to understand how did they derive the formula, also, is there any intuitive "feeling" for the base impedance? let me ask the […]

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Mastering Development

SEGFPE error in old ld when trying to run a binary

I am trying to compile binaries with heap vulnerabilities to practice binary exploitation. To do so, I need an old version of the libc so that doesn’t have all the security checks the modern ones do. I have on my computer a glibc-2.3.2.so file and a ld-2.3.2.so file. I made a small test program – […]

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Apple User Help

Adding external wired NAS to Time Capsule

First, I have none of this equipment, so I can’t just test it and see ..Yet. I Know I could hack a Time Capsule into a RaidBox via SATA/eSATA connector, But that’s not the route I’d like to go. If you plug in a NAS to a A1470 TC does acknowledge it’s existence ? And […]