Wind velocity vector, at a given point (sea breeze modelling)

Rotation of wind vector at a given point given by a solution of 2 dimensional linearized system of Euleur's equations. Taking into account only the pressure and Coriolis forces.

Permutations

It is time to write something about programming. Here I want to present a function implemented in python which returns the list of permutations of the given string.

#return the list of the permutations of s
def get_permutations(s):
  result = []
  if len(s) == 1:
     result.append(s)
     return result

  for i in range(0,len(s)):
     s_tmp = s.replace(s[i],s[0])[1:]
     subset_permuts = get_permutations(s_tmp)
     for perm in subset_permuts:
         result.append( s[i] + perm )
  return result

It takes 16.5364508629 seconds in order to find the permutations of the string '1234567890'.
For the code

print get_permutations('123');
print 'Execution time: ', time.time() - t0, ' s'

The output is following:
['123', '132', '213', '231', '321', '312']
Execution time: 5.88893890381e-05 s