Variable names

Allowed names for identifier (name of variable or function):

Any sequence of alphabetical character, number, or underline character _
First symbol has to be a character
Case sensitive
Not a python built-in keyword

Name space

The Python interpreter maps the name of an identifier in the active name space. The active name space depends on the active code block (module, function). The identifier can be local or global with respect to the active code block.

   1 def bad_style(x):
   2         # Name space of bad_style
   3         global y
   4         y=x 
   5         z=x
   6         return x
   7 
   8 # Name space of __main__
   9 x,y,z=2,2,2
  10 x=bad_style(1)
  11 print 'x=',x,'y=',y,'z=',z
  12 # y is changed!

   1 import scipy
   2 scipy.pi # pi is in the name space of scipy
   3 
   4 from scipy import pi
   5 pi # pi is in the active name space
   6 
   7 from scipy import *
   8 pi # all identifiers of scipy are in the active name space
   9 
  10 del(pi) # Deletes pi from the active name space
  11 reset   # ipython function to delete all identifiers

Built-in

Scalar

Plain integer: 9
Long integer: 9**99, 1L
Hex integer: 0x10
Floating point: 0.1
Exponential floating point: 1e-3
Complex: 3+2j

Casting

int()
long()
float()
complex()
str()

Sequences

String

Tuple

List

Dictionary

Extended data types

Array

Copy and reference

LehreWiki: SiaProgrammingPythonDatatypes (last edited 2008-04-13 17:13:34 by anonymous)

-  ⇤ ← Revision 4 as of 2008-04-13 12:27:08 → 
  Size: 1309
  Editor: anonymous
  Comment:
+   ← Revision 5 as of 2008-04-13 12:38:36 → ⇥
  Size: 1633
  Editor: anonymous
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 33:
+{{{#!python
import scipy
scipy.pi # pi is in the name space of scipy
-Line 34:
+Line 37:
+from scipy import pi
pi # pi is in the active name space

from scipy import *
pi # all identifiers of scipy are in the active name space

del(pi) # Deletes pi from the active name space
reset   # ipython function to delete all identifiers
}}}