Averages Hide the Extremes: Plotting 55 Years of City Temperatures

What does a yearly average hide about 55 years of city temperatures, and what appears once you plot the minimum and maximum too?

Finger exercises

Short drills on what this video just taught. Write the code, run the checks, and reveal the answer only if you are stuck.

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Exercise 1 of 5

Parse one line of the temperature file

Each line of the file looks like "SEATTLE,3.1,19610101\n": city, temperature in °C, date as YYYYMMDD. The helper CtoF(c) from the video is already defined. Define parse_record(line) so it returns a tuple (city, temp_f, year): the city string, the temperature converted to Fahrenheit as a float, and the year as a four-character string.

Given code — runs before yours

def CtoF(c):
    return (c * 9/5) + 32

def parse_record(line):
    # Strip the line ending, split on commas, convert the temperature,
    # and keep only the year part of the date.
    return ...

def parse_record(line):
    # Strip the line ending, split on commas, convert the temperature,
    # and keep only the year part of the date.
    return ...

Python runs in your browser

⌘/Ctrl + Enter runs

returns a tuple of three values

city and year are strings, with no line ending left

temperature is converted to Fahrenheit

works on another line

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