[Level 2] The sample of functools.partial() in Python. 

#!/bin/env python
import functools
try:
print int('10')    ## equiv: print int('10', base=10)
print int('10', 2) ## equiv: print int('10', base=2)
int2 = functools.partial(int, 2) ## no default bonding parameter.
print int2('10')   ## fail, must assign the value of base
int2 = functools.partial(int, base=2) ## set default base to 2
print int2('10')   ## equiv: print int2('10', base=2)
print int2('10', 10) ## fail, TypeError: keyword parameter 'base' was given by position and by name
print int2('10', base=10)
Wish this helps.
regards,
Stanley Huang

Comments

Post a Comment

Popular posts from this blog

[Level 1] Rar tool for Solaris.

Sometimes we will got a rar compressed file from our friends, but there is no default tool in OpenSolaris to decompress the rar filess. We can got a Solaris Intel version from rarlab . The steps as the following: 1. down load the rar tools from rarlab. http://www.rarlab.com/rar_add.htm 2. uncompressed the source. # gunzip ./unrar-sol-intel.gz 3. move it to the location you used to. # mv /unrar-sol-intel.gz /usr/bin/unrar 4. try to decomprss # unrar x ./test.rar Wish this helps. regards, Stanley Huang
Read more

[Level 2] iif in Python

If you want to implement iif in Python, please refer to the following sample code: #!/bin/env python def iif(b): return 'It\'s True' if b else 'It\'s False' print iif(True) print iif(False) And the following sample, guess what will you get! #!/bin/env python b = True print 'b: %s' % 'Ture' if b else 'False' b = False print 'b: %s' % 'Ture' if b else 'False' Result: $ ./iif.py b: Ture False The second result is "False", not "b: False". Why??? Because the prededence of string concatenation is higher than if. Therefore you need to use () to make it correct. #!/bin/env python b = True print 'b: %s' % 'Ture' if b else 'False' b = False print 'b: %s' % ('Ture' if b else 'False') Wish this helps. regards, Stanley Huang
Read more