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Scheduling a corroutine for a later loop iteration


Scheduling a corroutine for a later loop iteration

By : user2954307
Date : November 22 2020, 01:01 AM
Hope that helps There are two problems going on: first, you can't yield every kind of object from a coroutine, you must yield a Future or other special yieldable object. So when your coroutine yields 123123, Tornado throws a "bad yield" exception. Unfortunately, Tornado's websocket code isn't built to catch exceptions from "on_message" if "on_message" is a coroutine, so the exception passes silently. See the warning at the bottom of the coroutine documentation.
The solution for you is to yield a valid object from "mycoroutine". If you just want to yield for a moment, yield "gen.moment":
code :
print "one"
yield gen.moment
print "two"
mycoroutine(message)


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Output of previous bash loop iteration into next iteration for varying grep commands

Output of previous bash loop iteration into next iteration for varying grep commands


By : user1986700
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You can't run grep in a loop when it's reading from stdin. The first iteration will read all of stdin, and there's no way to rewind back to the beginning for the next iteration (files support seeking, but pipes don't, and there's no shell syntax to do it).
You can copy all of stdin to a temporary file before the loop and then process that file each time. Redirect the output to another temporary file, then copy that back over the input file to prepare for the next iteration.
code :
iterate-patterns() {
    tempfile=$(mktemp /tmp/patterns.XXXXXX)
    tempfile2=$(mktemp /tmp/patterns2.XXXXXX)
    cat > "$tempfile"
    for i in "${patterns[@]}"
    do
        if [[ "$i" = *-red ]]
        then
            GREP_COLOR="$RED" grep -E --text --color=always --line-buffered -f /var/lib/foobar/"${i}".txt "$tempfile" > "$tempfile2"
        elif [[ "$i" = *-yellow ]]
        then
            GREP_COLOR="$YELLOW" grep -E --text --color=always --line-buffered -f /var/lib/foobar/"${i}".txt "$tempfile" > "$tempfile2"
        elif [[ "$i" = *-green ]]
        then
            GREP_COLOR="$GREEN" grep -E --text --color=always --line-buffered -f /var/lib/foobar/"${i}".txt "$tempfile" > "$tempfile2"
        else
            cat "$tempfile" > "$tempfile2"
        fi
        cp "$tempfile2" "$tempfile"
    done
    cat "$tempfile"
    rm "$tempfile" "$tempfile2"
}
How to create continuous loop in C where each iteration of the loop occurs once per iteration of the loop it's inside

How to create continuous loop in C where each iteration of the loop occurs once per iteration of the loop it's inside


By : Chuck
Date : March 29 2020, 07:55 AM
wish helps you I'm creating a game in c. the game has a function called loop(), which calls other functions and has them update during each game loop. The game character is simply a char image. The issue that i'm having, is that I want this char image to continuously move in a direction after 1 keypress is made, however, I can only seem to get it to move once per keypress, meaning it needs to be held down to get continuous movement.
Impact of the prior loop iteration on the execution time of the current iteration

Impact of the prior loop iteration on the execution time of the current iteration


By : user3006509
Date : March 29 2020, 07:55 AM
it fixes the issue I can't be too confident on the exact details, but it seems to me to be a result of memory allocation in building the map. I replicated the behaviour you're seeing using a plain unordered_map and a single mutex, and making the map object in func static fixed it entirely. (Actually now it's slightly slower the first time around, since no memory has been allocated for the map yet, and then faster and a consistent time every subsequent run.)
I'm not sure why this makes a difference, since the map has been destructed and the memory should have been freed. For some reason it seems the map's freed memory isn't reused on subsequent calls to func. Perhaps someone else more knowledgeable than I can elaborate on this.
code :
void func(int num_insertions)
{
    const auto start = std::chrono::steady_clock::now();

    std::unordered_map<int, int> map;
    for (int i = 0; i < num_insertions; ++i)
    {
        map.emplace(i, i);
    }

    const auto end = std::chrono::steady_clock::now();
    const auto diff = end - start;

    const auto time = std::chrono::duration<double, std::milli>(diff).count();
    std::cout << "i: " << num_insertions << "\ttime: " << time << "\n";
}

int main()
{
    func(2048);
    func(16777216);
    func(2048);
}
i: 2048 time: 0.6035
i: 16777216     time: 4629.03
i: 2048 time: 124.44
i: 2048 time: 0.6524
i: 16777216     time: 4828.6
i: 2048 time: 0.3802
how to create a loop that checks for each iteration and starts back at the beginning after each iteration

how to create a loop that checks for each iteration and starts back at the beginning after each iteration


By : user3308653
Date : March 29 2020, 07:55 AM
I hope this helps you . i want to create a function that will randomly insert a space between words in a string by using a random num gen to choose either 1 or 2, then proceed to insert or to skip to the ending of the next word. i want this to only happen when the length of the string is less than the predefined limit i have put on it with the variable myLength. my main issue is that my poorly designed loop fills up the space between the first word and the second word, and does not check for the other ones. , First off, this pos:
code :
int pos = s.find_first_of(' ');
for (int pos; pos != string::npos; pos = s.find(' ', pos + 1)) {
for (int pos = s.find_first_of(' '); pos != string::npos; pos = s.find(' ', pos + 1)) {
Function reads iteration target as local argument string instead of iteration value in for loop

Function reads iteration target as local argument string instead of iteration value in for loop


By : Marta
Date : March 29 2020, 07:55 AM
Does that help IIUC, you want to loop though every column and create the cross tab against column Q, but your current loop won't produce anything.
Use the following to assign the results to a python dict that you can access with column names as the key:
code :
DF = pandas.read_excel('example.xlsx')

Categories = list(DF.columns.values)

cross_tabs = {}

for i in Categories:
    cross_tabs[i] = pandas.crosstab(DF.Q, DF[i], normalize = 'index', margins=True)
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