1 + 3


3. * 2.


complex(2.,4.) - complex(1.,6.)


3 * 9.2 # int * float = float


2. * complex(-1.,3.) # float * complex = complex


8 * complex(-3.3,1) # int * comples = comples


3 / 2


3 / float(2)


3 / 2.


3/2
3//2
#from __future__ import division (this does not work in the body of a script, it needs to be at the top!)


l = [4, 5.5, "spam"]
l[0]
l[1]
l[2]


t = (4, 5.5, "spam")
t[0]
t[1]
t[2]


l = [1, 2, 3, 4, 5]
l[2:4]


l[3:]
l[:3]
l[::2]


l[-1]
l[-2:]


r = l[::-1]
r


l[0] = 28
l
l[2:4] = [3, 8]
l


l = [3, 2, 'hello']
l
l[1], l[2]


l = [1, 2, 3, 4, 5]
l.append(6)


r + l


r.sort()


l = [1, 2, 3]
l.append('egg')  # For a full list of methods, type l. then press TAB!
l.insert(3, 'spam')


set([1, 2, 3, 2, 'spam', 'egg', 'spam'])


set([1,2,3]) - set([3,4])
set([1,2,3]) & set([3,4])
set([1,2,3]) | set([3,4])


'a' in set(['a', 'b', 'c', 'd', 'e', 'f'])


s = "Spam egg spam spam"


"I'm"
'"hello"'


'I\'m'
"\"hello\""


s = "hello"
s[0]
s[1]


s = "hello, world!"


s[5] = 'r'


"hello," + " " + "world!"


s = "Spam egg spam spam"
s.upper() # An uppercase version of the string
s.index('egg') # An integer giving the position of the sub-string
s.split() # A list of strings


print('{:8.3f}'.format(3.14159265))
print('{:.10f}'.format(3.14159265))
print('{:.6e}'.format(3.14159265))
print('{:04d}'.format(3))
print('{:g}'.format(3.14159265))
print('{:g}'.format(0))
print('{:g}'.format(10000000000000000000000))


d = {'name':'m31', 'ra':10.68, 'dec':41.27}
d['name']