Udacity.com-Intro-to-Computer-Science-Course-Answers - Converting Seconds

Udacity.com-Intro-to-Computer-Science-Course-Answers - Converting Seconds.py

# Write a procedure, convert_seconds, which takes as input a non-negative 
# number of seconds and returns a string of the form 
# '<integer> hours, <integer> minutes, <number> seconds' but
# where if <integer> is 1 for the number of hours or minutes, 
# then it should be hour/minute. Further, <number> may be an integer
# or decimal, and if it is 1, then it should be followed by second.
# You might need to use int() to turn a decimal into a float depending
# on how you code this. int(3.0) gives 3
#
# Note that English uses the plural when talking about 0 items, so
# it should be "0 minutes".
#

def convert_seconds(number):
    hours = int(number) / 3600
    minutes = ((int(number) - (hours *3600)) / 60)
    seconds = round(((number - (hours *3600) - (minutes *60))),2)
    
    hoursString = "hour"
    if(hours != 1):
        hoursString = "hours"
    minutesString = "minute"
    if(minutes != 1):
        minutesString = "minutes" 
    secondsString = "second"
    if(seconds != 1):
        secondsString = "seconds"    
        
    return repr(hours)+' ' + hoursString + ', '+repr(minutes) +" "+ minutesString +", "+repr(seconds) +" " + secondsString


print convert_seconds(3600)
#>>> 1 hour, 0 minutes, 1 seconds

print convert_seconds(3661)
#>>> 1 hour, 1 minute, 1 second

print convert_seconds(7325)
#>>> 2 hours, 2 minutes, 5 seconds

print convert_seconds(7261.7)
#>>> 2 hours, 1 minute, 1.7 seconds

Udacity.com-Intro-to-Computer-Science-Course-Answers - Download Calculator.py

# Write a procedure download_time which takes as inputs a file size, the
# units that file size is given in, bandwidth and the units for
# bandwidth (excluding per second) and returns the time taken to download 
# the file.
# Your answer should be a string in the form
# "<number> hours, <number> minutes, <number> seconds"

# Some information you might find useful is the number of bits
# in kilobits (kb), kilobytes (kB), megabits (Mb), megabytes (MB),
# gigabits (Gb), gigabytes (GB) and terabits (Tb), terabytes (TB).

#print 2 ** 10      # one kilobit, kb
#print 2 ** 10 * 8  # one kilobyte, kB

#print 2 ** 20      # one megabit, Mb
#print 2 ** 20 * 8  # one megabyte, MB

#print 2 ** 30      # one gigabit, Gb
#print 2 ** 30 * 8  # one gigabyte, GB

#print 2 ** 40      # one terabit, Tb
#print 2 ** 40 * 8  # one terabyte, TB

# Often bandwidth is given in megabits (Mb) per second whereas file size 
# is given in megabytes (MB).

def download_time(file_size,size_unit,bandwidth,bandwidth_unit):
    
    if(size_unit == "kb"):
        file_size = file_size * 2 ** 10
    if(size_unit == "kB"):
        file_size = file_size * 2 ** 10 * 8
    if(size_unit == "Mb"):
        file_size = file_size * 2 ** 20  
    if(size_unit == "MB"):
        file_size = file_size * 2 ** 20 * 8   
    if(size_unit == "Gb"):
        file_size = file_size * 2 ** 30 
    if(size_unit == "GB"):
        file_size = file_size * 2 ** 30 * 8  
    if(size_unit == "Tb"):
        file_size = file_size * 2 ** 40 
    if(size_unit == "TB"):
        file_size = file_size * 2 ** 40 * 8
        
    if(bandwidth_unit == "kb"):
        bandwidth = bandwidth * 2 ** 10
    if(bandwidth_unit == "kB"):
        bandwidth = bandwidth * 2 ** 10 * 8
    if(bandwidth_unit == "Mb"):
        bandwidth = bandwidth * 2 ** 20  
    if(bandwidth_unit == "MB"):
        bandwidth = bandwidth * 2 ** 20 * 8   
    if(bandwidth_unit == "Gb"):
        bandwidth = bandwidth * 2 ** 30 
    if(bandwidth_unit == "GB"):
        bandwidth = bandwidth * 2 ** 30 * 8  
    if(bandwidth_unit == "Tb"):
        bandwidth = bandwidth * 2 ** 40 
    if(bandwidth_unit == "TB"):
        bandwidth = bandwidth * 2 ** 40 * 8    

    number = float(file_size)/bandwidth
    hours = int(number) / 3600
    minutes = ((int(number) - (hours *3600)) / 60)
    seconds = round(((number - (hours *3600) - (minutes *60))),10)
    
    hoursString = "hour"
    if(hours != 1):
        hoursString = "hours"
    minutesString = "minute"
    if(minutes != 1):
        minutesString = "minutes" 
    secondsString = "second"
    if(seconds != 1):
        secondsString = "seconds"    
        
    return repr(hours)+' ' + hoursString + ', '+repr(minutes) +" "+ minutesString +", "+repr(seconds) +" " + secondsString
        

print download_time(1,'TB', 100, 'Mb')
#>>> 23 hours, 18 minutes, 6.08 seconds    

print download_time(5.56,'GB',1,'GB')
#>>> 0 hours, 0 minutes, 5.56 seconds

print download_time(1024,'kB', 1, 'MB')
#>>> 0 hours, 0 minutes, 1 second

print download_time(1024,'kB', 1, 'Mb')
#>>> 0 hours, 0 minutes, 8 seconds  # 8.0 seconds is also acceptable

print download_time(13,'GB', 5.6, 'MB')
#>>> 0 hours, 39 minutes, 37.1428571429 seconds

print download_time(13,'GB', 5.6, 'Mb')
#>>> 5 hours, 16 minutes, 57.1428571429 seconds

print download_time(10,'MB', 2, 'kB')
#>>> 1 hour, 25 minutes, 20 seconds  # 20.0 seconds is also acceptable

print download_time(10,'MB', 2, 'kb')
#>>> 11 hours, 22 minutes, 40 seconds  # 40.0 seconds is also acceptable