Oppiskele Using Query Parameters Effectively | Advanced API Usage and Data Processing

Query parameters are a powerful tool that allow you to customize API requests and control the data you receive from a server. When you make a request to an API endpoint, you can add query parameters to the URL to specify exactly what information you want. These parameters are placed after a question mark ("?") in the URL and are written as key-value pairs separated by an equals sign ("="). Multiple parameters are joined using an ampersand ("&"). By using query parameters, you can filter, sort, or limit the data returned by the API, making your requests more efficient and relevant to your needs.


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import requests

# Define the endpoint and parameters
url = "https://api.open-meteo.com/v1/forecast"
params = {
    "latitude": 52.52,
    "longitude": 13.405,
    "hourly": "temperature_2m"
}

# Make the GET request with the query parameters
response = requests.get(url, params=params)

# Parse the JSON response
data = response.json()

# Print a snippet of the hourly temperature data
print(data["hourly"]["temperature_2m"][:5])

When you need to include multiple query parameters in your API request, Python's requests library makes this easy by allowing you to pass a dictionary to the params argument in the get() function. Each key-value pair in the dictionary represents one query parameter. The library automatically constructs the correct URL by encoding the parameters and appending them to the endpoint. This method is much safer and more readable than manually building the URL string, especially as the number of parameters grows.


              123456789101112131415
            
import requests

url = "https://api.open-meteo.com/v1/forecast"
params = {
    "latitude": 52.52,
    "longitude": 13.405,
    "hourly": "temperature_2m"
}

response = requests.get(url, params=params)
data = response.json()

# Iterate over the first five hourly temperature values and print each one
for i, temp in enumerate(data["hourly"]["temperature_2m"][:5], start=1):
    print(f"Hour {i}: {temp}°C")

Using query parameters gives you precise control over the data you retrieve from an API. By adjusting parameters, you can filter results, select specific fields, or change the format of the response. This not only reduces the amount of data you need to process but also minimizes bandwidth usage and speeds up your application. When working with APIs, always check the documentation to see which query parameters are supported and how they can help you refine your requests.

1. What is the purpose of query parameters in an API request?

2. How can you pass multiple query parameters in a requests.get() call?

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Suggested prompts:

What other types of data can I request from this API using query parameters?

Can you explain how to add more query parameters to filter or sort the results?

How do I know which query parameters are available for a specific API?

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              123456789101112131415161718
            
import requests

# Define the endpoint and parameters
url = "https://api.open-meteo.com/v1/forecast"
params = {
    "latitude": 52.52,
    "longitude": 13.405,
    "hourly": "temperature_2m"
}

# Make the GET request with the query parameters
response = requests.get(url, params=params)

# Parse the JSON response
data = response.json()

# Print a snippet of the hourly temperature data
print(data["hourly"]["temperature_2m"][:5])


              123456789101112131415
            
import requests

url = "https://api.open-meteo.com/v1/forecast"
params = {
    "latitude": 52.52,
    "longitude": 13.405,
    "hourly": "temperature_2m"
}

response = requests.get(url, params=params)
data = response.json()

# Iterate over the first five hourly temperature values and print each one
for i, temp in enumerate(data["hourly"]["temperature_2m"][:5], start=1):
    print(f"Hour {i}: {temp}°C")

1. What is the purpose of query parameters in an API request?

2. How can you pass multiple query parameters in a requests.get() call?

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 3. Luku 1