cs101 ยป

```
# Write a procedure, count_words, which takes as input a string
# and returns the number of words in the string. You may consider words
# as strings of characters separated by spaces.
def count_words():
passage =("The number of orderings of the 52 cards in a deck of cards "
"is so great that if every one of the almost 7 billion people alive "
"today dealt one ordering of the cards per second, it would take "
"2.5 * 10**40 times the age of the universe to order the cards in every "
"possible way.")
print count_words(passage)
#>>>56
```

```
# Write a procedure, speed_fraction, which takes as its inputs the result of
# a traceroute (in ms) and distance (in km) between two points. It should
# return the speed the data travels as a decimal fraction of the speed of
# light.
speed_of_light = 300000. # km per second
def speed_fraction():
print speed_fraction(50,5000)
#>>> 0.666666666667
print speed_fraction(50,10000)
#>>> 1.33333333333 # Any thoughts about this answer, or these inputs?
```

```
# 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
def convert_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
```

```
# 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 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) whereas file size is given in
# megabytes (MB).
def download_time():
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
```