ModuleNotFoundError: No module named ‘flask’
The ModuleNotFoundError: No module named ‘flask’ error occurs when Python cannot find the Flask module. Here’s how to fix it step by step: 1. Check If Flask is Installed Run….
Category: Python
Unexpected behavior with global variables in threads
When using global variables in Python multithreading, you may experience unexpected behavior due to race conditions, shared state issues, and improper synchronization. 1. Common Issues and Fixes A. Race Condition:….
Thread starvation in multithreading
Thread starvation occurs when some threads are unable to execute because other high-priority threads continuously consume CPU time, preventing lower-priority threads from making progress. This can lead to system slowdown….
Multiprocessing queue not responding
When using Python’s multiprocessing.Queue, sometimes the queue stops responding or deadlocks. This usually happens due to improper synchronization, processes not terminating, or data not being flushed properly. 1. Common Causes….
BrokenProcessPool: process pool is broken
The BrokenProcessPool error occurs when using Python’s concurrent.futures.ProcessPoolExecutor or multiprocessing.Pool(). It indicates that the worker processes in the pool have failed, usually due to crashes, timeouts, or pickling issues. 1…..
PicklingError: Can’t pickle local object
The PicklingError: Can’t pickle local object occurs when attempting to serialize (pickle) an object that is defined within a local scope, such as inside a function, lambda, or class method…..
Process still running after termination request
If a process is still running after a termination request, it could be due to several reasons. Below are common causes and solutions: Common Causes and Solutions 1. Process Not….
Deadlock in Python threading
Deadlock is a common problem in concurrent programming that occurs when two or more threads are waiting for each other to release a resource, creating a cycle where none of….
RuntimeError: calling start() on an already running thread
This error occurs when you attempt to call .start() on a thread that is already running. In Python, a thread can be started only once, and trying to restart an….
RuntimeError: threads can only be started once
This error occurs when you try to start a Python thread more than once using the threading module. A thread can only be started once, and attempting to restart an….