for loop in Python

Question

In C C    I can have the following loop   for int k   1  k  lt   c   k   2    How do the same thing in Python   I can do this   for k in range 1 c     In Python  which would be identical to   for int k   1  k  lt   c   k      in C C

User · Answer

Try using this   for k in range 1 c 1 2

User · Answer

In C C    we can do the following  as you mentioned  for int k   1  k  lt   c   k    for int k   1  k  lt   c   k   2    We know that here k starts with 1 and go till  predefined  c with step value 1 or 2 gradually  We can do this in Python by following    for k in range 1 c 1   for k in range 1 c 1 2     Check this for more in depth

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You should also know that in Python  iterating over integer indices is bad style  and also slower than the alternative  If you just want to look at each of the items in a list or dict  loop directly through the list or dict   mylist    1 2 3  for item in mylist      print item  mydict     1  one   2  two   3  three   for key in mydict      print key  mydict key    This is actually faster than using the above code with range    and removes the extraneous i variable   If you need to edit items of a list in-place  then you do need the index  but there s still a better way   for i  item in enumerate mylist       mylist i    item  2   Again  this is both faster and considered more readable   This one of the main shifts in thinking you need to make when coming from C   to Python

User · Answer

In Python you generally have for in loops instead of general for loops like C C    but you can achieve the same thing with the following code   for k in range 1  c 1  2     do something with k   Reference Loop in Python

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If you want to write a loop in Python which prints some integer no etc  then just copy and paste this code  it ll work a lot    Display Value from 1 TO 3   for i in range 1 4       print    i  value of loop     Loop for dictionary data type   mydata     Fahim   Pakistan    Vedon   China    Bill   USA         for user  country in mydata iteritems        print user   belongs to    country

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The range   function in python is a way to generate a sequence  Sequences are objects that can be indexed  like lists  strings  and tuples  An easy way to check for a sequence is to try retrieve indexed elements from them  It can also be checked using the Sequence Abstract Base Class ABC  from the collections module    from collections import Sequence as sq isinstance foo  sq    The range   takes three arguments start  stop and step    start   The staring element of the required sequence stop     n 1 th element of the required sequence step    The required gap between the elements of the sequence  It is an optional parameter that defaults to 1    To get your desired result you can make use of the below syntax   range 1 c 1 2

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Here are some example to iterate over integer range and string    initial final but not included gap  for i in range 1 10 2      print i    1 3 5 7 9     initial  final but not included      note  4 not included for i in range  1 4       print i   1 2 3    note  5 not included for i in range  5     print  i   0 1 2 3 4     you can also iterate over strings myList     quot ml quot   quot ai quot   quot dl quot       for i in myList    print i   output   ml ai dl

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The answer is good  but for the people that want this with range    the form to do is   range end     gt  gt  gt  list range 10    0  1  2  3  4  5  6  7  8  9    range start end      gt  gt  gt  list range 1  11    1  2  3  4  5  6  7  8  9  10    range start end  step      gt  gt  gt  list range 0  30  5    0  5  10  15  20  25

User · Answer

Use this instead of a for loop   k   1 while k  lt   c      code    k    1

[python] for loop in Python

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