print math.degrees(math.atan2(1,0))
# 90

print math.degrees(math.atan2(1,-1))
# 135.0

print math.degrees(math.atan2(-1,-1))
# -135.0
---------------------------------------
for x in (90,135,180,270,360):
  print math.radians(x)
# Output:

1.57079632679
2.35619449019
3.14159265359
4.71238898038
6.28318530718

for x in (1.6,2.4,3.1,4.7,6.3):
  print math.degrees(x)
# Output:
91.6732472209
137.509870831
177.616916491
269.290163711
360.963410932
---------------------------------------
for x in (0,1,2,math.log(7)):
  print math.exp(x),
# 1.0 2.71828182846 7.38905609893 7.0

print
print math.ldexp(1,6)
# 64.0
print math.ldexp(2.5,6)
# 160.0

for b in (2,math.e,7,10):
  print round(math.log(10,b),4),
# 3.3219 2.3026 1.1833 1.0

print math.log(1024,2)
# 10.0
---------------------------------------
for x in (-1.3,-4,0.5,2,2.7):
  print math.floor(x), math.ceil(x)
# Output:

-2.0 -1.0
-4.0 -4.0
 0.0  1.0
 2.0  2.0
 2.0  3.0
---------------------------------------
print math.e
# 2.71828182846

print math.pi
# 3.14159265359
---------------------------------------
for k in xrange(1,8):
  print cmath.sin(k*math.pi*1j)
# Output:

11.5487393573j
267.744894041j
6195.82386361j
143375.656567j
3317811.99967j
76776467.6977j
1776660640.42j
---------------------------------------
def somma (*a):
  s=0
  for x in a: s+=x
  return s

v=[1,2,4,9,2,8]
s=apply(somma,v)
print s # 26
---------------------------------------
def f(x,y): return (x+y)/2.0

print reduce(f,[3]),
print reduce(f,[3,4]),
print reduce(f,[3,4,5]),
print reduce(f,[3,4,5,8])
# 3 3.5 4.25 6.125
---------------------------------------
def hornerr (a,x):
  def f(u,v): return x*u+v
  return reduce(f,a,0)

a=[7,2,3,5,4]
print hornerr(a,10)
# 72354
---------------------------------------
def frazcont (v):
  def f(x,y): return y+1.0/x
  w=v[:]; w.reverse()
  return reduce(f,w)

print frazcont([2,3,1,5])
# 2.26086956522 = 52/23.0