Re: [Tutor] /tutorial/controlflow.html "break statement"

[Flynn, Stephen (L & P - IT)]

> The script studied was :
> 
> for n in range(2, 10):
>  for x in range(2, n):
>  if n % x == 0:
>  print(n, 'equals', x, '*', n//x)
>  break
>  else:
>  print(n, 'is a prime number')

The code above is not what you ran below, in idle. Look at the
indentation of the else: line, which completely alters the execution
flow of the code. It should be aligned with a the inner "for" and you
have it aligned with the inner "if".

> Here is the result given in IDLE3 on my Presario CQ61:
> 
>  >>> for n in range(2,10):
>  for x in range(2, n):
>  if n % x == 0:
>  print(n, '=',x,'*',n//x)
>  break
>  else:
>  # loop fell through without finding a factor
>  print(n, 'is a prime number')


Make the change and you'll get the output you were expecting.




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[Tutor] /tutorial/controlflow.html "break statement"

[Pierre-Michel Averseng]

Hello,

what do you think about the results given by IDLE3 with a script studied 
recently in T. Digest Vol 117, issue 70 & seq. ?


I'm working with Linux (Debian family => i.e Linux Mint LMDE :
[please, could you excuse my poor English... ?  Thanks !  ;^))   ]

Linux hojulien 3.10-2-486 #1 Debian 3.10.5-1 (2013-08-07) i686 GNU/Linux
Python 3.3.2+ (default, Aug  4 2013, 17:23:22)
[GCC 4.8.1] on linux

The script studied was :

for n in range(2, 10):
for x in range(2, n):
if n % x == 0:
print(n, 'equals', x, '*', n//x)
break
else:
print(n, 'is a prime number')

Here is the result given in IDLE3 on my Presario CQ61:

>>> for n in range(2,10):
for x in range(2, n):
if n % x == 0:
print(n, '=',x,'*',n//x)
break
else:
# loop fell through without finding a factor
print(n, 'is a prime number')


3 is a prime number
4 = 2 * 2
5 is a prime number
5 is a prime number
5 is a prime number
6 = 2 * 3
7 is a prime number
7 is a prime number
7 is a prime number
7 is a prime number
7 is a prime number
8 = 2 * 4
9 is a prime number
9 = 3 * 3

I found this script at : 
http://docs.python.org/3/tutorial/controlflow.html#break-and-continue-statements-and-else-clauses-on-loops




4.4. break
 and
continue

Statements, and else

Clauses on Loops

The break  
statement, like in C, breaks out of the smallest enclosing for 
 or while 
 loop.


Loop statements may have an else clause; it is executed when the loop 
terminates through exhaustion of the list (with for 
) or when 
the condition becomes false (with while 
), but 
not when the loop is terminated by a break 
 
statement. This is exemplified by the following loop, which searches 
for prime numbers:


>>>
>>>  for  n  in  range(2,  10):
... for  x  in  range(2,  n):
... if  n  %  x  ==  0:
... print(n,  'equals',  x,  '*',  n//x)
... break
... else:
... # loop fell through without finding a factor
... print(n,  'is a prime number')
...
2 is a prime number
3 is a prime number
4 equals 2 * 2
5 is a

Surprising !  isn't it ?

Best regards

Pierre
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