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⇤ ← Revision 1 as of 2009-12-03 13:13:03
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| {{density.png}} | {{attachment:density.png}} |
Contents
Basic Python
- Allowed names for identifier
Assignments, e.g. a=1, a,b=1,2, a+=1
Comparisons, e.g. ==, !=
Lists and their methods, e.g. L.append()
Strings and their methods, e.g. .replace(), .split(),
Dictionaries and their methods, e.g. D.keys()
Indexing and slicing, e.g. L[-2:]
Loops, e.g. for i,j in enumerate(['Hund','Katze','Maus']):
Control statements, e.g. if
Importing modules, e.g. import scipy
Getting help, e.g. help()
Defining functions, e.g. def function(x,y):
Working with files, e.g. fid=open(filename,'r')
scipy, numpy, pylab
Array creation, e.g. zeros(), array(), linspace()
Array methods, e.g. .shape(), .reshape(), .tofile(), .flat(), .transpose()
Plotting, e.g. plot(), contour
Example:
1 from pylab import *
2 # The seawater module is installed only for Python2.6.2
3 # module load Python/2.6.2
4 import seawater
5
6 S=linspace(0,35)
7 T=linspace(-2,35.0)
8
9 rho=zeros((S.size,T.size))
10
11 for i,t in enumerate(T):
12 rho[i,:]=seawater.dens(S,t)
13
14 figure()
15 CS = contour(S,T,rho,15,colors='k')
16 clabel(CS, fontsize=8, inline=1)
17 ylabel('Temperature [$^\circ$C]')
18 xlabel('Salinity')
19 title('Sea water density [kg/m$^3$]')
20 show()
21 savefig('density.png',dpi=75)