# Sharp marks comments to end of line
# Python is case sensitive
# ; is optional
print 'hello', 'there',
print 'world'              # Prints 'hello there world'
i = 3;
I = 2   * i
print i, I              # 3 6

# Python is self typed - no declarations needed
# Creates ints, floats, strings, as needed
#   and selects appropriate operations

j = 2   * i
print j                 # 6  - i and j are ints

f = 2.3 * i
print f                 # 6.9  - f is a float

s = "Hello"  
t = 3 * s               # three copies of the string
print t                 # HelloHelloHello

# Won't allow misusing strings as ints

# u = s + 3               # Error: Won't convert 3 to string
u = s + '3'               # + concatenates strings
print u                   # Hello3

n = '34'           
# n = n + 1               # Error: Won't convert n to int

# Can use explicit conversions
a = '1'
b = 2 * int(a)
print b                   # 2
c = str(2) + a 
print c                   # 21
d = int(5.9)
print d                   # 5 - truncates

# Type of  a variable  can change
d = "abc"                 # d is now a string
print d                   # Prints abc

# Long integers have infinite precision
x = 8111111111111111111111L
y = 3 * x
print y       # 24333333333333333333333L


# Will convert between int and float as needed for output
# Will convert to string as needed for output

print '%i %f %s' % (i,i,i)    #  3 3.000000 3
print '%i %f %s' % (f,f,f)    #  6 6.900000 6.9
print '%s %s %s' % (s,s,s)    #  must use %s for string variables

n = '34'           
#print '%i' % n    # Error: Won't convert to int automatically