# [docs] Tutorial code is missing a break statement

philip at primacystudios.com philip at primacystudios.com
Mon Aug 8 20:37:07 CEST 2011

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Hello,

In section 4.4 "break and continue..." of the v2.7.2
tutorial documentation the loop iterates and returns a different output
than what is depicted.

Documentation printed output:

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

Here is the code:

>>> 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'

My printed output:

3 is a prime number
4 equals 2 * 2
5 is
a prime number
5 is a prime number
5 is a prime number
6 equals 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 equals 2 * 4
9 is a prime number
9 equals 3
* 3

I added a break statement to the else clause:

>>> 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'
break

To get
what is in the tutorial:

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

I hope this helps.

Phil Templeton

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