How to Resolve "Python SSL: CERTIFICATE_VERIFY_FAILED" With urllib or requests
An HTTPS request from Python fails with a certificate verification error, even though the same URL loads fine in a browser. This is Python's SSL layer refusing...
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How to Fix "SyntaxError: Non-Default Argument Follows Default Argument"
Defining a function fails before it can even run, with Python's parser rejecting the parameter order outright. Unlike most runtime errors, this one is caught...
How to Resolve "ImportError: Cannot Import Name X From Partially Initialized Module"
An import that should work fine fails with a message specifically mentioning a "partially initialized module," which is Python's precise way of describing a...
How to Fix "FATAL: password authentication failed for user" in PostgreSQL
PostgreSQL rejects your connection attempt with a password authentication error, even when you're confident the password is correct. This error means...
How to Fix "PostgreSQL Column Does Not Exist" Casing/Quote Issue
A query references a column you can clearly see in your table definition, but PostgreSQL insists it doesn't exist. This is almost always a case-sensitivity...
How to Fix "ERROR: Deadlocks Detected" in PostgreSQL Transactions
Two concurrent transactions each wait on a lock the other holds, and PostgreSQL detects the standoff and automatically kills one to break the cycle. Unlike an...
How to Resolve "PostgreSQL Slow Query Due to Missing Index on JSONB"
A query filtering on data stored inside a JSONB column takes far longer than an equivalent query on a normal indexed column, even on a table that isn't...
How to Fix "Could Not Connect to Server: Connection Refused" in psql
Running psql fails before you even get to a login prompt, with the connection actively refused rather than timing out or asking for a password. This means...
How to Fix "Error 1045 (28000): Access Denied for User 'root'@'localhost'"
You try to connect to MySQL as root and get rejected outright, even with a password you're sure is correct. Error 1045 means MySQL received your connection...