# tuples
tuple1 = (2, 4.0, "some", "string", True)

print tuple1

str1 = 'This is a \ndouble line. He said, "I\'m hungry"'
str2 = "This is a \ndouble line"
str3 = """This is a
double line"""
print str1
print str2
print str3

print "-" * 70

lst = [2, 4.0, "some", "string", True]
lst[1] = 6
print lst

# This does not work : tuple1[1] = 6

tuple2 = (4,6)
# This does not work : tuple2.append(4)
tuple1 = (5,)

print "tuple1 : ", tuple1

print "sum of tuples", tuple1+tuple2

tuple1 = tuple1 + (7,)
print "tuple1 with 7", tuple1

(a, b, c) = (4, 6,7)
a, b = 5, 7
print "a + b = ", a+b

print tuple1[0]

print "*"* 70
# elif

n = 4
if n > 0 :
	print "%d is positive." % n
elif n < 0 :
	print "%d is negative." % n
elif n == 0 :
	print "the number is zero."
else :
	print "I don't like your number."
	
# Nested ifs and elifs
(size, wt) = (100, 7)
if size > 60 :
	print "Too big"
elif size > 40 :
	print "Big but I'll let you go if you pay."
	if wt > 8 :
		print "Too heavy"
	else :
		print "weight is ok."
else :
	print "Perfect bag."
	if wt > 8 :
		print "Too heavy"
	else :
		print "weight is ok."

	

# defining your own functions

def my_exp(x, n) :
	if n == 0 :
		power = 1
	elif n > 0 :
		power = 1
		for i in range(n) :
			power *= x
	else : 
		power = 1.0
		for i in range(-n) :
			power /= x
	return power


print "3 ** -8  =", my_exp(3, -8), 3**-8

#Another definition
import math

def my_exp2(x, n) :
	if n == 0 :
		power = 1
	elif n != 0  and x > 0:	
		power = math.exp(n * math.log(x))
	elif x == 0 :
		power = 0
	elif x < 0 and n > 0 :
		print "Cannot find the power."
		power = None
	return power

print my_exp2(-5, .5)