# Lab 7, CS0008, Fall 2013
#
# Files and 2-dimensional arrays
#
# Specification of the input file:
#
# The file has 3 header lines.
# After that, each line contains the average monthly temperatures
# for a year (separated by spaces) starting with January.  
#
# Use nested lists to represent the temperatures.
# Each element of the list is a list of 12 measurements, one for each month.
#
# Let's use a smaller example:  suppose we have only 4 months, and the data
# is the following:
#
#24.7    25.7    30.6    47.5   
#16.1    19.1    24.2    45.4   
#10.4    21.6    37.4    44.7
#
#
#  Your list will be:
#  [[24.7,25.7,30.6,47.5],[16.1,19.1,24.2,45.4],[10.4,21.6,37.4,44.7]]
#
#  We'll number the years 0 to 2, and the months 0 to 3.
#
#  temperature[2][3] is 44.7, the temperature for year 2, month 3.
#
#  This is like using 2-dimensional arrays in other languages,
#  an important thing to know.
#
# Here are the names of the months typed in for you:
# 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'June', 'July', 'Aug', 'Sept', 'Oct', 'Nov', 'Dec'
#
# Note:  a couple of the functions are almost the same.  None of them are very large.
#   When possible one function should call another.
#

def inputTemperatureData(filename):
    '''Open the specified filename,
    read past the three-line header, read in the temperature data on
    the file, and close the file.  Return the temperature data in the
    form of a list of lists, where each list element is a list of 12
    temperature readings.'''

    # Hint: use readline to read the first three lines, and then
    # a while loop to read the numbers.  See read_sales.py.txt 
    #  on the schedule for 10/7 and the Python Shell for 10/9.
    #
    # Hint: you need to convert the input from strings to
    #  to floats.  

def printDataPoint(tempData,mo,yr):
    '''tempData is the tempData is the data structure returned
    by inputTemperatureData.  mo is an integer in the range 0 to 11.
    yr is in the range 0 to len(tempData) - 1.  Print the temperature
    for that month and that year.  Suppose mo is 1 and yr is 3.
    The output should look like this (assuming the value is 65.7):
    The ave. monthly temperature during Feb in the 4th year is 65.7'''

    # Do not use a big if - elif - statement!

def avgTempMarch(tempData):
    '''Return the average temperature for the month of March as a float 
    for all years in tempData. tempData is the data structure returned
    by inputTemperatureData.'''

def avgTemp(tempData, mo):
    '''Return the average temperature for month mo as a float for all
    years in temp_data, where mo is an integer
    between 0 and 11, representing January to December,
    respectively. tempData is the data structure returned
    by inputTemperatureData.'''


def higherAvgTemp(tempData, mo1, mo2):
    '''Return either mo1 or mo2 (integers representing months in the
    range 0 to 11), whichever has the higher average temperature for
    all years in tempData.  If the months have the 
    same average temperature, then return -1. tempData is the data structure returned
    by inputTemperatureData.'''

def avgTemps (tempData):
    ''' Return the average of all the temperatures sotred in tempData. tempData is the
    data structure returned by inputTemperatureData.'''

def grade(myAns,correctAnswer):
    if myAns == correctAnswer:
       print("Correct, the answer is",myAns)
    else:
       print("My answer is",myAns,"but the correct answer is",correctAnswer)

def main():
    tempData = input_temperature_data("lab7.dat.txt")
    grade(avgTempMarch(tempData),32.475)
    grade(avgTemp(tempData,3),46.525)
    grade(higherAvgTemp(tempData,2,3),3)
    printDataPoint(tempData,mo=5,yr=2)

main()