a = 1
a + 1
b = 2.1
b + 1
a + b
type(a + b)
c = 1.5 + 0.5j # complex numbers
print c.real
print c.imag
d = 3 > 4
print d
type(d)
s = "Hello everyone"
type(s)
a = "Hello "
b = "World"
print a + b
a = 1
print a
print type(a)
b = float(a)
print b
print type(b)
s = "1.23"
print s
print type(s)
f = float(s)
print f
print type(f)
l = ['red', 'blue', 'green', 'black', 'white']
len(l)
l
print l[0]
print l[1]
print l[2]
print l[-1] # last element
print l[-2]
l[0] = 'orange'
print l
print l[2:5]
print l[2:-1]
print l[1:6:2]
l[::-1]
ll = [5, 22.9, 14.8+1j, 'hello', [1,2,3]]
ll
print ll[0]
print ll[1]
print ll[2]
print ll[3]
print ll[4]
d = {'name': 'Jonathan', 'id': 223984, 'location': 'USA'}
d.keys()
d.values()
d['name']
d['id']
d['id'] = 1234
d['id']
t = ('red', 'blue', 'green')
t[0]
t[1:3]
t[1] = 'orange'
a = 10
if a == 10:
print "a is 10"
a = 10
if a > 10:
print "a is larger than 10"
else:
print "a is less than 10... or maybe equal too"
a = 4
if a > 10:
print "a is larger than 10"
elif a < 10:
print "a is less than 10"
else:
print "a is equal to 10"
for i in range(10):
print i
for color in ['red', 'blue', 'orange']:
print "My favorite color is", color
def func():
print "Hello world"
func()
def func2(name):
print "Hello", name
func2("Jonathan")
def times2(x):
return x * 2
y = times2(2)
print y
def times_something(x, y=2):
print x*y
times_something(3)
times_something(3, 3)
class Car(object):
engine = 'V4' # class attribute
def start(self): # class method
print "Starting the car with a", self.engine, "engine"
mycar = Car()
type(mycar)
mycar.engine
mycar.start()
mycar.engine = 'V6'
mycar.engine
mycar.start()
import numpy as np
a = np.array([0, 1, 2, 3, 4, 5, 6, 7])
a
a.shape
a.ndim
a.dtype
a[0::2]
a[a>3]
a * 2 + 100
a.mean()
b = np.arange(12).reshape(3,4)
b.shape
b
b[1,2]
b[0:2, ::-1]
import scipy
print scipy.__doc__
%pylab inline
plot([1,2,3])
a = np.random.rand(30, 30)
imshow(a)
colorbar()