Retrieving key-value data with Redis

Now that you've practiced storing key-value pairs with Redis and Python, it's time to explore the other half of that process: retrieving key-value pairs. In this example, you'll practice retrieving a few different key-value pairs that you might find in a web application built to report on weather data.

A connection object has been created and stored in the variable redis_conn. Enjoy!

Cet exercice fait partie du cours

Introduction to NoSQL

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Instructions

Use the redis_conn variable and the appropriate method to try and parse the temperature for each city in the list of cities from Redis.
If the temperature value is None for the passed key, set "unknown temperature" as the value for that key, and print a short message.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

# Loop through each of the cities
for city in cities:
	# Grab the temperature
    temperature = ____.___(f"{city}_temp")
    
    # Check if the temperature is None
    if temperature is None:
    	# Store an unknown temperature
        ____.____(f"{city}_temp", "unknown temperature")
        print(f"Unknown temperature in {city}")
    
    else:
      	# Otherwise, print the temperature
    	print(f"The temperature in {city} is {temperature}")

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