[Tutor] Reading a CSV file

[Cameron Simpson]

On 12Jun2020 18:59, John Weller <john at johnweller.co.uk> wrote:
>I have a CSV file with 366 rows each with 4 comma separated fields; day_no,
>date, sunrise, sunset.  The top row contains the field names.  I want access
>the time of sunrise and sunset from file for a particular day_no.
>
>I have tried:
>
>import csv
>
>with open('sun_times_gmt.csv', newline= '') as csvfile:
>    sun_times = csv.DictReader(csvfile, delimiter=',')
>    for row in sun_times:
>        print(row['sunrise'])
>
>but it prints out the entire column.  How do I specify a particular 
>row?

By putting the print inside an if-statement that recognises the row.  So 
changing:

    for row in sun_times:
        print(row['sunrise'])

into:

    for row in sun_times:
        if some test of row['day_no']:
            print(row['sunrise'])

which will cause the print statement to only work if the test succeeds.  
What the test is depends on what "a particular day_no" means.

Cheers,
Cameron Simpson <cs at cskk.id.au>