The Python documentation in Portuguese is a work in progress, and fairly confusing how can you see .
I have difficulties in English and I find this site that I can not read.
So, how can I use break , pass and continue to control program flows in Python?
Are there any examples?
If we translate the words, they give us a hint of what they actually do with the flow:
break : is to break, break (or interrupt) the natural flow of the program continue : is to continue, that is, the natural flow of the cycle continues pass : is to pass, that is, lets pass. These things get clearer with an example:
numeros = list()
for i in xrange(10):
numeros.append(i)
When we print the list, we get:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Let's then test our flow control commands:
for item in numeros:
if item >= 2:
break
print item
The break should break the execution of for , and that's exactly what happens, we get the following result:
0
1
Now for continue :
for item in numeros:
if item == 4:
continue
print item
The continue should continue execution of for , which when it finds an item equal to four, will move to the next iteration. And we get the result without the 4 :
0
1
2
3
5
6
7
8
9
As pointed out by @MarcoAurelio, it does not make sense to put a continue at the end of the list of commands in a cycle, since there is nothing else to do and the cycle will automatically move to the next iteration.
The pass is a word that must be used whenever the program requests a syntactic filling of a gap, such as defining a function: after the line of def there must be some content
def soma_de_quadrados(x, y):
pass # k = x**x + y**y
# return k
The code above ensures that even if I am not sure about the function, it can exist and be used in the rest of my code, without error.