An iterator provides successive values until they are exhausted. In Python, a file object can supply lines to a for loop, while zip() supplies paired values to a CSV writer. section 13.4 section 22.5.2
file_object = open("myfile", 'r')
count = 0
for line in file_object:
count = count + 1
print(count)
file_object.close()
Count file lines by iterating over the file object; lines are read and processed one at a time. section 13.4
import requests
import csv
response = requests.get("https://archive-api.open-meteo.com/v1/era5?latitude=41.879&longitude=-87.64975
&start_date=2024-07-01&end_date=2024-07-31&daily=temperature_2m_mean")
weather_history = response.json() #1
weather_data = zip(weather_history["daily"]["time"],
weather_history["daily"]["temperature_2m_mean"]) #2
with open("weather_history.csv", "w", newline="") as file:
writer = csv.writer(file)
writer.writerow(["Date", "Temperature"])
writer.writerows(weather_data) #3
#1 The response object 's json() method returns data as JSON.
#2 The zip() function returns an iterator of the combined lists.
#3 The writerows() method writes all rows the from iterator weather_data.
zip() pairs weather dates with temperatures, and writerows() consumes the resulting iterator to write CSV rows. section 22.5.2
