Here’s the working version of the code in question (requires at least version Matplotlib 1.1.0 from 2011-11-14): import numpy as np import matplotlib.pyplot as plt plt.axis([0, 10, 0, 1]) for i in range(10): y = np.random.random() plt.scatter(i, y) plt.pause(0.05) plt.show() Note the call to plt.pause(0.05), which both draws the new data and runs the GUI’s … Read more
For most purposes, you probably won’t notice a difference. However, foreach reads each line into a list (not an array) before going through it line by line, whereas while reads one line at a time. As foreach will use more memory and require processing time upfront, it is generally recommended to use while to iterate … Read more
The design of this depends on what you want doing for 15s. The two most plausible cases are “do this every X for 15s” or “wait for X to happen or 15s whichever comes sooner”, which will lead to very different code. Just waiting Thread.sleep(15000) This doesn’t iterate, but if you want to do nothing … Read more
A couple of changes mean that only an R or r will roll. Any other character will quit import random while True: print(‘Your score so far is {}.’.format(myScore)) print(“Would you like to roll or quit?”) ans = input(“Roll…”) if ans.lower() == ‘r’: R = np.random.randint(1, 8) print(“You rolled a {}.”.format(R)) myScore = R + myScore … Read more
Yes* Yes, usually (and in your case) it does break out of the loop and returns from the method. An Exception One exception is that if there is a finally block inside the loop and surrounding the return statement then the code in the finally block will be executed before the method returns. The finally … Read more
but on the other hand it creates a completely useless list of integers just to loop over them. Isn’t it a waste of memory, especially as far as big numbers of iterations are concerned? That is what xrange(n) is for. It avoids creating a list of numbers, and instead just provides an iterator object. In … Read more
An if statement runs its else clause if its condition evaluates to false. Identically, a while loop runs the else clause if its condition evaluates to false. This rule matches the behavior you described: In normal execution, the while loop repeatedly runs until the condition evaluates to false, and therefore naturally exiting the loop runs … Read more
Do not use the pipe, it creates a subshell. Example below. #!/bin/bash declare -i AUX=0 while IFS=” read -r -d ” file; do ### DO SOMETHING with $file### (( ++AUX )) echo $AUX done < <(find . -type “f” -name “*.mp3”) echo $AUX
As tadman stated in the comment under your question. The best approach should use a modulus operator (%) with 3. Place your separating condition at the start of each iteration. (Demo) Like this: $x=0; // I prefer to increment starting from zero. // This way I can use the same method inside a foreach loop … Read more
Because you typed ‘a‘ and ‘\n‘… The ‘\n‘ is a result of pressing the [ENTER] key after typing into your terminal/console’s input line. The getchar() function will return each character, one at a time, until the input buffer is clear. So your loop will continue to cycle until getchar() has eaten any remaining characters from … Read more