Contents
- average5.py
- function_example.py
- module_example.py
- new_for.py
- simple_for.py
- sum5.py
- temp_table.py
- using_xrange.py
- xrange_analysis.py
average5.py 1/9
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# This program adds up 5 numbers from the user.
# By CS111, 01.24.2011
NUM_NUMBERS=2
print "This program will average", NUM_NUMBERS,"numbers given by the user."
# keep track of running total
total = 0
# Repeat: get the five numbers from the user,
# keep running total
for n in xrange(1, NUM_NUMBERS+1):
num = input("Enter number " + str(n) + ": ")
# update the running total
total = total + num
average = float(total)/NUM_NUMBERS
# display average
print "The average is", 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.py 6/9
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# This program adds up 5 numbers from the user.
# By CS111, 01.24.2011
NUM_NUMBERS=10
print "This program will add up", NUM_NUMBERS,"numbers given by the user."
# keep track of running total
total = 0
# Repeat: get the five numbers from the user,
# keep running total
for n in xrange(1, NUM_NUMBERS+1):
num = input("Enter number " + str(n) + ": ")
# update the running total
total = total + num
# display total
print "The total is", total
temp_table.py 7/9
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# Print out the table of temperatures
# By CS111
# print out the labels
underline = "-"*6
print "%10s %10s %10s" % ( "Temp F", "Temp C", "Temp K" )
print "%10s %10s %10s" % ( underline, underline, underline)
# Better to calculate these conversions, but that's a lab problem
ftemp = -459.67
ctemp = -273.15
ktemp = 0
print "%10.1f %10.1f %10.1f" % ( ftemp, ctemp, ktemp)
ftemp = 0
ctemp = -17.77778
ktemp = 255.222
print "%10.1f %10.1f %10.1f" % ( ftemp, ctemp, ktemp)
ftemp = 32
ctemp = 0
ktemp = 273.15
print "%10.1f %10.1f %10.1f" % ( ftemp, ctemp, ktemp)
using_xrange.py 8/9
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# Examples of using xrange, with different numbers of parameters
# by Sara Sprenkle
#
# TODO: 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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