Contents

  1. average5.py
  2. function_example.py
  3. module_example.py
  4. new_for.py
  5. simple_for.py
  6. sum5.mod.py
  7. sum5.py
  8. using_xrange.py
  9. xrange_analysis.py

average5.py 1/9

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# Example of Implementation of "Accumulator" Design Pattern
# Computes the average of 5 numbers, given by the user
# by CSCI 111

# A constant for how many numbers to input
NUM_TO_INPUT = 5

# initialize the accumulator variable
total = 0

# number of times to loop
for i in xrange(NUM_TO_INPUT):
    num = input("Enter number: ")
    # Update the accumulator
    total += num
    print "You inputted", num
    print "\tRunning total: ", total    

# Compute the average, protect against integer division
average = float(total) / NUM_TO_INPUT

print "The total of the inputted numbers", total
print "The average of the inputted numbers", average

function_example.py 2/9

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# Examples using built-in functions
# Sara Sprenkle

#x = 6.817654321
x = 5.6512542

print "We start with x having value", x

# Call the function round with input x
# Then, save output of function call in variable roundx
roundx = round(x)
print "x rounded to the nearest int:", roundx

round2 = round(x, 1)
print "x rounded to the nearest tenth:", round2

a = round(x, 2)
print "x rounded to the nearest hundredth:", a

roundx = round(x, 3)
print "x rounded to the nearest thousandth:", roundx

print round(x, 4)

print "-"*40
print "x is of", type(x)

module_example.py 3/9

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# Example of importing a module
# by Sara Sprenkle

# Alternative: could import math
# Would then need to prepend all constants, functions with math.
from math import *

i = 1j

# The equation e^(i pi) + 1 = 0
shouldbezero =  e ** (i * pi) + 1

print "e^(i pi) + 1 equals", shouldbezero


# practice using functions from modules
print "100^(1/2) =", sqrt(100)

new_for.py 4/9

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# More xrange examples
# Sara Sprenkle

print "-------------- xrange(1, 15, 3) ------------"
for a in xrange(1,15,3):
    print a

print "-------------- xrange(5, -15, -5) ------------"
for b in xrange(5, -15, -5):
    print b

# Demonstrate these after handout ... 
    
# Won't display anything
print "-------------- xrange(5, -15, 5) ------------"
for counter in xrange(5, -15, 5):
    print counter

# Won't display anything
print "-------------- xrange(-5, 15, -5) ------------"
for counter in xrange(-5, 15, -5):
    print counter

print "-------------- xrange(5, 15, 1.5) ------------"
# Note that xrange expects integer values
for counter in xrange(5.5, 15, 1):
    print counter

simple_for.py 5/9

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# Examples of for loops using xrange
# by Sara Sprenkle

# The "chorus" gets repeated 5 times
for i in xrange(5):
    print "You say 'hello'"
    print "And, I say 'goodbye'..."

    
num_repetitions = 5
   
print

# for loop with only one statement that gets repeated
for x in xrange(num_repetitions): print "Repeat the chorus!"

sum5.mod.py 6/9

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# keep track of running total
total = 0 

# repeat: get user input for 5 numbers,
# keep running total
for i in xrange(1, 6):
    userNum = input("Enter number " + str(i) + ": ")
    # update running total
    total = total + userNum
    # Alternative:  total += userNum

# display total
print "The total is", total


sum5.py 7/9

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# Example of Implementation of "Accumulator" Design Pattern
# Computes the total of 5 numbers, given by the user
# by CSCI 111

# A constant for how many numbers to input
NUM_TO_INPUT = 5

# initialize the accumulator variable
total = 0

# Number of times to loop
for i in xrange(NUM_TO_INPUT):
    num = input("Enter number: ")
    # update the accumulator variable
    total += num
    print "You inputted", num
    print "\tRunning total: ", total    

# display the result
print "The total of the inputted numbers", total

using_xrange.py 8/9

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# Examples of using xrange, with different numbers of parameters
# by Sara Sprenkle
#

# Part 2: Use constants


print "------------ xrange(10) ------------"
for x in xrange(10):
    print x

print "----------- xrange(5,10) -----------"
for y in xrange(5, 10):
    print y

print "----------- xrange(1,10,1) -------------"
for x in xrange(1, 10, 1):
    print x

    
# What happens if step is negative?
# What happens if stop < start?

xrange_analysis.py 9/9

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# Example of for loops using xrange
# by Sara Sprenkle

# Question: what does xrange do?
for i in xrange(10):
   squared = i * i
   print i , "^2 =\t", squared

print i

# QUESTION FOR CLASS:
# How is i changing each time through the loop?


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