Creating for loop until list length

Question

I m reading about for loops right now  and I am curious if it s possible to do a for loop in Python like in Java   Is it even possible to do something like  for  int i   1  i  lt  list length  i      and can you do another for loop inside this for loop    Thanks

User · Answer

I d try to search for the solution by google and the string Python for statement  it is as simple as that  The first link says everything   A great forum  really  but its usage seems to look sometimes like the usage of the Microsoft understanding of all their GUI products  benefits  windows inside  idiots outside

User · Answer

You could learn about Python loops here  http   en wikibooks org wiki Python Programming Loops  You have to know that Python doesn t have   and   for start and end of loop  instead it depends on tab chars you enter in first of line  I mean line indents    So you can do loop inside loop with double tab  indent   An example of double loop is like this   onetoten   range 1 11  tentotwenty   range 10 21  for count in onetoten      for count2 in tentotwenty         print count2

User · Answer

Yes you can  with range  docs     for i in range 1  len l          i is an integer  you can access the list element with l i    but if you are accessing the list elements anyway  it s more natural to iterate over them directly   for element in l       element refers to the element in the list  i e  it is the same as l i    If you want to skip the the first element  you can slice the list  tutorial    for element in l 1                     can you do another for loop inside this for loop    Sure you can

User · Answer

In Python you can iterate over the list itself   for item in my list      do something with item   or to use indices you can use xrange     for i in xrange 1 len my list        as indexes start at zero so you                                       may have to use xrange len my list        do something here my list i    There s another built-in function called enumerate    which returns both item and index   for index item in enumerate my list         do something here   examples   In  117   my lis list  foobar    In  118   my lis Out 118     f    o    o    b    a    r    In  119   for item in my lis      print item                f o o b a r  In  120   for i in xrange len my lis        print my lis i                 f o o b a r  In  122   for index item in enumerate my lis       print index  -- gt   item                0 -- gt  f 1 -- gt  o 2 -- gt  o 3 -- gt  b 4 -- gt  a 5 -- gt  r

User · Answer

The answer depends on what do you need a loop for   of course you can have a loop similar to Java   for i in xrange len my list      but I never actually used loops like this   because usually you want to iterate  for obj in my list   or if you need an index as well  for index  obj in enumerate my list    or you want to produce another collection from a list  map some func  my list    somefunc x  for x in my list    also there are itertools module that covers most of iteration related cases  also please take a look at the builtins like any  max  min  all  enumerate  I would say - do not try to write Java-like code in python  There is always a pythonic way to do it

[python] Creating for loop until list.length

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