Python Initialise a list to a specific length

Below show some tricks that you can play to create a list of certain size

 

 

 

 

def main():
    check(5, '''\\ms\dist\msdotnet\PROJ\cafguiadmin\2012.129.0\examples\CommandLine\CommandLine.exe''', ">null 2>&1")
#    for i, v in enumerate(initializeList(5)):
#        print "i: {0}, v: {1}" % (i, v)
    for i, v in enumerate(initializeList(5, value = None)):
        print "{0}:{1}".format(i, v)
    for i, v in enumerate(initializeList2(5, value = None)):
        print "{0}:{1}".format(i, v)


def initializeList(size, value=None):
#    l = [None] * size
    l = []
    for i in range(size):
        l.append(value)
    return l
    
def initializeList2(size, value=None):
    return [value] * size; 
 

 

So in a nutshell, they are two ways that you can create and initalize a list with a fixed size, 

 

  • with the * operator on list (which is to create duplicate the list n times)
  • create an empty list and stack things onto it

 

 


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