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
<http://docs.python.org/3/reference/simple_stmts.html#break> and
continue
<http://docs.python.org/3/reference/simple_stmts.html#continue>
Statements, and else
<http://docs.python.org/3/reference/compound_stmts.html#else>
Clauses on Loops
The break <http://docs.python.org/3/reference/simple_stmts.html#break>
statement, like in C, breaks out of the smallest enclosing for
<http://docs.python.org/3/reference/compound_stmts.html#for> or while
<http://docs.python.org/3/reference/compound_stmts.html#while> loop.
Loop statements may have an else clause; it is executed when the loop
terminates through exhaustion of the list (with for
<http://docs.python.org/3/reference/compound_stmts.html#for>) or when
the condition becomes false (with while
<http://docs.python.org/3/reference/compound_stmts.html#while>), but
not when the loop is terminated by a break
<http://docs.python.org/3/reference/simple_stmts.html#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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