"hello world"

'hello again'

"""A string
that spans
multiple
lines"""
# Note how python identifies `\n` as the linebreak character

hw = "hello world"

print hw

help(str)

new_string = "hello" + "world" # Note no spaces within the "s!

print new_string

new_string = "hello " + "world" # Note the space

print new_string

print "This is the first %s %s wrote" % ( "code", "Jose" )

what_wrote = "code"
who_wrote = "Jose"
what_year = 2012
print "This is the first %s %s wrote in %d" % ( what_wrote, who_wrote, what_year )

hw = "hello world"

hw.count ( "l" ) # Count the number of times "l" apears in hw

hw.find ( "l" ) # Find the first location of "l" in hw. Note that python starts counting at 0, not 1!

hw.find ( "lo" ) # Ditto

hw.isdigit () # Is this string a digit?

hw.replace ( "world", "everyone" ) # Replace one substring with another

hw.split () # Split the string into words

line = raw_input ( "Enter something: " )
line = line.strip()
while True:
    if line == "" or line == "q":
        break
    try:
        print line
    except:
        pass
    line = raw_input ( "Enter something: " )
    line = line.strip()

var_1 = True
var_2 = False
type( var_1 )


var_1 and var_2

var_1 or var_2

not var_1 or var_2


a_string = "1 2 3" # This is just a string
type ( a_string ) # Test that it is indeed a list

type ( a_string.split() ) # Split a string to create a list of elements...

my_list = [ 1, 2, "three", "four", "5" ] # A list. In this case, an mix of ints and strs

type ( my_list ) # Check the type

print my_list [0] # Print the first element


print my_list [3] # The fourth element

print my_list [ 0:2] # Select from first to third element (non-inclusive)


print my_list [0:4:2]# Select from 0 to 4, skipping every other element

print my_list [ -1 ] # -1 is the last element

print my_list [ :-3] # Select from element 0 (ommitted) to third from the end

print my_list [-3:] # Select from 3rd element from the end to end (ommitted)


help(list) # or see [this](http://docs.python.org/tutorial/datastructures.html#more-on-lists)


my_list = [ "twinkle", "little" ]
my_list.insert ( 0, my_list[0].capitalize() )
my_list.append ( "star" )
print my_list

my_list = [ "twinkle" ] *2 + "little star".split()
print my_list


print [ ( s== "star" and "bat" ) or s for s in my_list]

extra=" How I wonder what you are"
my_list.extend ( extra.split() )
print my_list

my_list.remove ( "you")
print my_list

my_list.insert ( -1, "ur" )
my_list.pop ( -1 )
print my_list


len ( my_list )



print "1" + "1"
print 1 + 1

i = 1
print i

i += 1
print i

i = i + 1
print i

i *= 2
print i

i = i*2
print i

i = i/2
print i

i = i + 1
print i/2 ###!!!

print i/2, i % 2

print "This is an integer: %d" % ( i )

print "This is the same integer: %03d" % ( i )

print 3.0/2

print "%21.10f" % ( 1.0e10 + 1e-6)

my_dict = { "key1": "something", "key2": "other", "key3":150. }
print my_dict

print my_dict[ "key1" ]

some_other_dict = { "older_dict": my_dict, "some_key": 42 }
print some_other_dict

my_dict[ "key3" ] = my_dict[ "key3" ]*3
print some_other_dict

my_dict[ "key2" ] = None

print some_other_dict

modis_bands = ['630-690','780-900','450-520','530-610','1230-1250','1550-1750','2090-2350']
band_numbers = range ( 1, len( modis_bands ) + 1 )
modis = dict ( zip ( band_numbers, modis_bands ) )
for i, m in modis.iteritems(): # Also itervalues, iterkeys, etc...
    print i, m

the_data = [[1.,2.,3.,4.,5.],[1.,4.,9.,16.,25.]]
print the_data
print len ( the_data )
print len ( the_data[0] ), len ( the_data[1] )

output_file = open ( "temporary_file.txt", 'w' )
for i in range ( len( the_data[0] ) ):
    output_file.write ( "%f %f\n" % ( the_data[0][i], the_data[1][i] ) )
output_file.close()

input_file = open ( "temporary_file.txt", 'r' )
input_data = input_file.readlines()
print input_data

data = []
values = []
for i in xrange ( len ( input_data ) ):
    the_line = input_data[i].strip().split()
    data.append ( float ( the_line[0] ) )
    values.append ( float ( the_line[1] ) )
new_data = [ data, values ]
print "new_data: ", new_data
print "the_data: ", the_data
print "Are they equal?", new_data == the_data