Python crash course workshop given at Canada/USA Mathcamp 2013

workshop.py

# CanadaUSA Mathcamp Python Workshop
# Given by Lewis Ellis and Lucas Garron
print 'hello'

a = 3
print a
a = 5
print a
b = 3.6

c = 'string'
print b
print c

d = True
print d

print (a == 5)

print type(a), type(b), type(c), type(d)

print 3 + 2
# + - * /
print 3+2, 5-3, 6*2, 8/4
# % **
print 7 % 3, 2**5

print 2**10000

print 'Math'*3+'camp'
print 'Bunni'*2+'toki'*2

print a + b

l = [1,2,3,4,5]
print l
l = [1,2,'hello', True]
print l
print l[0], l[2]
print l[-1]

print len(c), len(l)
print round(3.4), round(3.6)
print int(3.6), int(3.4), str(5), float(3)

print bool(''), bool(0), bool([])
print bool('anything'), bool(2), bool([1,2,3])

def f(x):
  return x*2

print f(3), f(7), f('math'), f([1,2,3])

def g(x,y):
	return x+y

print g(1,2), g([1,2],[3,4])

if (a == 6):
	print 'true is true!'
else:
	print 'false is not true!'

if (a == 4):
	print 4
elif (a == 6):
	print 6
else:
	print 5

b1 = True
b2 = True
b3 = False
if (b1 and b2) or not b3:
	print 'that is a true expression'

l = range(3,6)
print l
l = range(5)
print l

# for .. in
total = 0
for item in l:
	total = total + item
	total += item
	print item
print total

def factorial(x):
	if x == 0:
		return 1
	else:
		total = 1
		for n in range(1,x+1):
			total = total * n
		return total
print factorial(3), factorial(6)
print len(str(factorial(10000)))

def list_sum(l):
	total = 0
	for item in l:
		total = total + item
	return total
print list_sum(range(1000000))
print sum(range(1000000))

# Calculate the product of each number in a list with its index
l = [3, 7, 8, 11]
print l[2]
total = 0
for i in range(len(l)):
	total = total + l[i] * i
print total

# Calculate the sum of every number 1 through 1000 which is
# a multiple of 3 or a multiple of 5
total = 0
for x in range(1000):
	if (x % 3 == 0) or (x % 5 == 0):
		total = total + x
print total

def is_prime(x):
	if x < 2:
		return False
	for divisor in range(2, int(x**0.5)+1):
		if x % divisor == 0:
			return False
	return True

for i in range(2,9):
	print i, 'is prime?', is_prime(i)

a = 64
while a > 4:
	print a
	a = a / 2
print a

a = 5
while True:
	a = a + 1
	if a > 8:
		break
print a

# What is the 10,001st prime number?
currently_checking = 0
number_of_primes_found = 0
while number_of_primes_found < 10001:
	currently_checking = currently_checking + 1
	if is_prime(currently_checking):
		number_of_primes_found = number_of_primes_found + 1
print currently_checking

if True:
	a = 10
print a
def f(x):
	a = 11
	return x
print f(3)
print a

import math
print math.sqrt(9)
print math.pi, math.e
print math.ceil(3.2)

import random
for i in range(3):
	print random.random()

l = []
for i in range(4):
	l.append(i*2)
print l

"""
	Recursive factorial definition:
	0! = 1
	n! = n*(n-1)!
"""
def factorial_recursive(x):
	if x == 0:
		return 1
	else:
		return x*factorial_recursive(x-1)

print factorial_recursive(6)

# fib(1) = fib(2) = 1
# fib(n) = fib(n-1) + fib(n-2)
def fib(n):
	if n < 3:
		return 1
	else:
		return fib(n-1) + fib(n-2)

for i in range(10):
	print fib(i)

fibs = [1,1,2,3,5,8,13,21,34]
def fib_smarter(n):
	if n-1 < len(fibs):
		return fibs[n-1]
	else:
		fibs.append(fib_smarter(n-1) + fib_smarter(n-2))
	return fibs[n-1]

print fib_smarter(4)
print fib_smarter(5)
print fib_smarter(7)
for i in range(30, 50):
	print fib_smarter(i)

n = 1
while math.log(fib_smarter(n), 10)+1 < 1000:
	n = n + 1
print fib_smarter(n)
print n

l = []
for i in range(10):
	if i % 2 == 0:
		l.append(2**i)
print l

print [2**i for i in range(10) if i%2 == 0]

matrix = [[1,0,0],
		  [0,1,0],
		  [0,2,1]]
print matrix
print matrix[0]
print matrix[0][0]
print matrix[2][1]

for char in 'hello':
	print char

"""
Things to look at/google for:
Learn python the hard way
codecademy
learnpython.org
documentation on python.org

Problems to try:
projecteuler.net
6, 8, 14, 15, 29, 30

Email Lewis:
	[email protected]
Email Lucas:
	See www.garron.us

"""