ns and adding input and output files
# ===============================================
import csv as c
import math as m

inDataFile = '2019_09_calgary_hourly.csv'
outFileName = 'results.txt'

# ===============================================
#  declaring variables for column values in the csv
# ===============================================

FIELD_YEAR = 5
FIELD_MONTH = 6
FIELD_DAY = 7
FIELD_HOUR = 8
FIELD_TEMP = 9

# ===============================================
#  requesting user input data for date and converting those values to strings
# ===============================================

userDataStr = input('Enter a YEAR, Month and day e.g. 2019-09-01: ').split('-')

userYear = int(userDataStr[0])
userMonth = int(userDataStr[1])
userDay = int(userDataStr[2])

# ===============================================
#  decalaring coldest temp and hour values and converting coldest tempt to a str
# ===============================================

currentColdestTemp = float(9999999999.99)
currentColdestHour = ['Not set yet!']

# ===============================================
#  with loop to open the in datafile and out datafiles with a csv read and skipping the headers of the csv file
# ===============================================

with open(inDataFile, 'r') as datafile, open(outFileName, 'w') as resultsFile:
    csvFile = c.reader(datafile, dialect='excel')
    next(csvFile, None)
# ===============================================
#  for loop that includes a nested if statement for comparing user and csv data
# ===============================================
    for record in csvFile:
        fileYear = record[FIELD_YEAR]
        fileMonth = record[FIELD_MONTH]
        fileDay = record[FIELD_DAY]
        fileHour = record[FIELD_HOUR]
        fileTemp = float(record[FIELD_TEMP])
        if fileYear == userYear and fileMonth == userMonth and fileDay == userDay:
# ===============================================
#  The following if statement compares the file temp with current coldest temp if file temp is lower the old coldest tempt is cleared and the file is appended
# ===============================================
            if fileTemp < currentColdestTemp:
                list.clear(currentColdestHour)
                currentColdestHour.append(fileHour)
                currentColdestHour.append(fileTemp)
                currentColdestTemp = fileTemp
    resultsFile.write(f'The coldest hour is : {currentColdestHour}\n')
print('Done...')