#Starter code for Assignment 7


from pylab import *

#After some Excel wrangling, we have a csv file that
#only contains the EMS records for 9AM to 5PM on weekdays.
#The last column contains the elapsed time, in seconds, between
#successive calls. We treat the 9 to 5 period as a 'wraparound', so
#that if the last call of the day was at 4:58, and the first call of
#the next day at 9:01, then we say the elapsed time between the two
#is 3 minutes

def get_data('ems_call9_to_5.csv'):
    f=open(filename)
    listen=[]
    for line in f:
        listen.append(line)
    return listen

#return a list of the succssive elapsed times:

def get_elapsed_times(u):
    #strip header:
    u=u[1:]
    #strip newline character at end
    u=[x[:-1] for x in u]
    #split into the comma separated components
    u=[x.split(',') for x in u]
    return [int(x[-1]) for x in u[:-1]]