As per the navigateUp() documentation and popBackStack() documentation, both return a boolean value indicating: true if the stack was popped and the user has been navigated to another destination, false otherwise The NavController only controls its own back stack (i.e., the destinations you’ve put on the back stack) and does not contain or operate on … Read more
I was finally able to work out the code for my scraping. It seemed to be working fine and then all of a sudden when I ran it again, I got the following error message: I am not sure why as I changed nothing in my code. Please advise.
This is the problem Since a is null, NullPointerException will arise every time you use it until you initialize it. So this: will fail. A possible solution would be initialize it when declaring it: IMO more important than solving this exception, is the fact that you should learn to read the stacktrace and understand what … Read more
I have applied every solution available on internet but still I cannot run Docker. I want to use Scrapy Splash on my server. Here is history of commands I ran. You can see I tried to restart my server as well, but it didnt help. see output of ps -aux | grep docker
It’s better to use unicode than extended ASCII, which is non-standard. A thread about printing unicode characters in C : printing-utf-8-strings-with-printf-wide-vs-multibyte-string-literals But indeed you need to copy paste unicode characters.. A better way to start:
Using exit_flag.wait(timeout=DELAY) will be more responsive, because you’ll break out of the while loop instantly when exit_flag is set. With time.sleep, even after the event is set, you’re going to wait around in the time.sleep call until you’ve slept for DELAY seconds. In terms of implementation, Python 2.x and Python 3.x have very different behavior. … Read more
This line doesn’t do the right thing: You want to count by 32, that’s either or I strongly recommend making the numeric and character values match during your output. So change to
You can do something like this, it will create array with new size based on provided. The output will be:
The better practice is to use for-each. Besides violating the Keep It Simple, Stupid principle, the new-fangled forEach() has at least the following deficiencies: Can’t use non-final variables. So, code like the following can’t be turned into a forEach lambda: Can’t handle checked exceptions. Lambdas aren’t actually forbidden from throwing checked exceptions, but common functional … Read more
The effects of the three different methods to remove an element from a list: remove removes the first matching value, not a specific index: del removes the item at a specific index: and pop removes the item at a specific index and returns it. Their error modes are different too: