# string 
s = '40'
r = '20'

print r + s

# int
s = 40
r = 20

print r + s

# float
s = 40.0
r = 20.0

print r + s

# boolean
s = True
r = False

print s or r

print s and r

print 42 == 42

print 4 > 5

c = True
print (42 >= 41) and ('A' == 'a' or c)

# list
l = ['A', 'C', 'G', 'T']
print l[0]
l[0] = 'a'

l.append('U')
print l

print l[10]

# dict
d = {'A':'T','T':'A','G':'C','C':'G'}
print d['A']
print d['T']

d['A'] = 'U'
d['U'] = 'A'
del d['T']

print d['N']

# tuple
t = (1,2,3)
print t[0]

t[1] = 5

for c in 'ACCGATTGACC':
    print c.lower(),

n = 20
range(n)

sequence = list('ACCGAGGACCATACATTA')
for i in range(25):
    shuffle(sequence)
    print ''.join(sequence)

sequence = 'ACCTAGGCAT'
result = []
for base in sequence:
    if base == 'T':
        result.append('U')
    elif base == 'A' or base == 'C' or base == 'G':
        result.append(base)
    else:
        print "Unknown base (%s). Cannot complete." % base
        exit()
print ''.join(result)

def complement_sequence(seq,complements={'A':'T','C':'G','T':'A','G':'C'}):
    result = []
    for base in seq:
        result.append(complements[base])
    return ''.join(result)

# Define a sequence
my_seq = 'ACCGATTAGCCA'

# Print its complement
print complement_sequence(my_seq)

# Save its complement to a new variable
my_seq_comp = complement_sequence(my_seq)
print my_seq_comp

# Change a default value in the function
my_seq_comp_non_default = complement_sequence(my_seq,{'A':'t','C':'g','T':'a','G':'c'})
print my_seq_comp_non_default