Solution:Step 1: Understand environment variable visibilityEnvironment variables must be exported in the shell to be visible to Python processes.Step 2: Check other options for correctnessos.getenv can read env vars; SECRET_KEY is not reserved; os.environ[] raises error if missing, not safer.Final A

[Solved] You wrote this code:import os secret_key = os.getenv('SECRET_KEY') print(secret_key)But it always prints None even though you set the environment variable. What is the likely problem? | Flask

Flask - Deployment

You wrote this code:

import os
secret_key = os.getenv('SECRET_KEY')
print(secret_key)

But it always prints None even though you set the environment variable. What is the likely problem?

AYou must use os.environ['SECRET_KEY'] instead

Bos.getenv cannot read environment variables

CSECRET_KEY is a reserved Flask variable

DThe environment variable was not exported in the shell

Step-by-Step Solution

Solution:

Step 1: Understand environment variable visibility
Environment variables must be exported in the shell to be visible to Python processes.
Step 2: Check other options for correctness
os.getenv can read env vars; SECRET_KEY is not reserved; os.environ[] raises error if missing, not safer.
Final Answer:
The environment variable was not exported in the shell -> Option D
Quick Check:
Env vars must be exported to be read [OK]

Quick Trick: Export env vars in shell before running Flask app [OK]

Common Mistakes:

MISTAKES

Thinking os.getenv is broken
Believing SECRET_KEY is reserved
Using os.environ[] without checking existence

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You wrote this code:

Step 1: Understand environment variable visibility

Step 2: Check other options for correctness

Final Answer:

Quick Check:

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