while expression: statement (s)
In Python, all statements indented by the same number of character spaces after the code construct are considered part of the same block of code. Python uses indentation as its method of grouping statements.
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Output:
Hello Geek Hello Geek Hello Geek
See this is for an example where a while loop is used for iterators. As mentioned in the article, it is not recommended to use a while loop for iterators in python.
# Loop through the list
print ( " List Iteration " )
l = [ " geeks " , "for" , "geeks" ]
for i in l:
print (i)
# Iterate over a tuple (immutable)
print ( "Tuple Iteration" )
t = ( "geeks" , "for" , " geeks " )
for i in t:
print (i)
# Iterate over the line
( "String Iteration" )
s = "Geeks"
for i in s:
print (i)
# Looping through the dictionary
print ( "Dictionary Iteration" )
d = dict ()
d [ 'xyz' ] = 123
d [ 'abc' ] = 345
for i in d:
print ( "% s % d" % (i, d [i]))
Output:
List Iteration geeks for geeks Tuple Iteration geeks for geeks String Iteration G eeks Dictionary Iteration xyz 123 abc 345
We can use an in loop for custom iterators. See Output: from __ future__ import print_function for i in range ( 1 , 5 ): for j in range (i): print (i, end = '' ) print ( ) 1 2 2 3 3 3 4 4 4 4
Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects created in that scope are destroyed. Python supports the following control statements.
Continue Statement
Returns the control to the beginning of the loop.
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Output:
Last Letter: s
Exercise:
How to print a list in reverse order (last to first element) using while and for loops.
This article contributed by Ashirvad Kumar. If you like Python.Engineering and would like to contribute, you can also write an article and mail it to [email protected] See my article appearing on the Python.Engineering homepage and help other geeks.
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