Printing one character at a time from a string using the while loop

Question

Im reading  Core Python Programming 2nd Edition   They ask me to print a string  one character at a time using a  while  loop   I know how the while loop works  but for some reason i can not come up with an idea how to do this  I ve been looking around  and only see examples using for loops   So what i have to do   user gives input   text   raw input  Give some input        I know how to read out each piece of data from an array  but i can t remember anything how to do it to a string    Now all i need is working while-loop  that prints every character of the string  one at a time   i guess i ve to use len text   but i m not 100  sure how to use it in this problem   Some help would be awsome  I m sure this is a very simple issue  but for some reason i cannot come up with it   Thx in advance

User · Answer

Python allows you to use a string as an iterator   for character in  string       print character    I m guessing it s your job to figure out how to turn that into a while loop

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I m quite sure  that the internet is full of python while-loops  but one example   i 0  while i  lt  len text       print text i      i    1

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Python Code    for s in myStr          print s   OR  for i in xrange len myStr        print myStr i

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Try this instead     Printing each character using while loop i 0 x  quot abc quot  while i lt len x        print x i  end  quot   quot       print i      i  1

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make a list out of text -   h   e   l   l   o      text   list  hello        while text         print text pop         In python empty object are evaluated as false  The  pop   removes and returns the last item on a list  And that s why it prints on reverse    But can be fixed by using    text pop  0

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Other answers have already given you the code you need to iterate though a string using a while loop  or a for loop  but I thought it might be useful to explain the difference between the two types of loops   while loops repeat some code until a certain condition is met  For example   import random  sum   0 while sum  lt  100      sum    random randint 0 100   add a random number between 0 and 100 to the sum     print sum   This code will keep adding random numbers between 0 and 100 until the total is greater or equal to 100  The important point is that this loop could run exactly once  if the first random number is 100  or it could run forever  if it keeps selecting 0 as the random number   We can t predict how many times the loop will run until after it completes   for loops are basically just while loops but we use them when we want a loop to run a preset number of times  Java for loops usually use some sort of a counter variable  below I use i   and generally makes the similarity between while and for loops much more explicit   for  int i 0  i  lt  10  i        starting from 0  until i is 10  adding 1 each iteration     System out println i       This loop will run exactly 10 times  This is just a nicer way to write this   int i   0  while  i  lt  10      until i is 10    System out println i      i      add one to i      The most common usage for a for loop is to iterate though a list  or a string   which Python makes very easy   for item in myList      print item   or  for character in myString      print character   However  you didn t want to use a for loop  In that case  you ll need to look at each character using its index  Like this   print myString 0   print the first character print myString len myString  - 1    print the last character    Knowing that you can make a for loop using only a while loop and a counter and knowing that you can access individual characters by index  it should now be easy to access each character one at a time using a while loop   HOWEVER in  general you d use a for loop in this situation because it s easier to read

User · Answer

This will print each character in text  text   raw input  Give some input      for i in range 0 len text       print text i

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Strings can have for loops to     for a in string      print a

User · Answer

Try this procedure   def procedure input       a 0     print input a      ecs   input a   ecs stands for each character separately     while ecs    input          a   a   1         print input a    In order to use it you have to know how to use procedures and although it works  it has an error in the end so you have to work that out too

[python] Printing one character at a time from a string, using the while loop

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