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I have the following code:
for i in list1:
if i == 5:
#skip the NEXT iteration (not the end of this one)
else:
#do something
How do I skip the iteration that comes after the iteration that throws the skip. For example, if list1=[1, 2, 3, 4, 5, 6, 7], the loop will skip 6 and go straight to 7 because 5 triggered the skip
I've seen this question and several others, but they all deal with skipping the current iteration, while I want to skip the next iteration. The answers to those questions suggest continue, which as far as I can tell will stop the remainder of the current iteration and move on to the next one, which is not what I want. How can I skip a single iteration in a loop?
Edit: Using next() has been suggested, but this does not work for me. When I run the following code:
a = [1, 2, 3, 4, 5, 6, 7, 8]
ai = iter(a)
for i in a:
print i
if i == 5:
_ = next(ai)
I get
1
2
3
4
5
6 #this should not be here
7
8
Using next() is also the suggestion in this question: Skip multiple iterations in loop python
427
When you want to skip n values, call next() n+1 times (don't forget to assign the value of the last call to something) and then "call" continue.
You can use a continue statement in Python to skip over part of a loop when a condition is met. Then, the rest of a loop will continue running. You use continue statements within loops, usually after an if statement.
Python provides two keywords that terminate a loop iteration prematurely: The Python break statement immediately terminates a loop entirely. Program execution proceeds to the first statement following the loop body. The Python continue statement immediately terminates the current loop iteration.
To break out of a for loop, you can use the endloop, continue, resume, or return statement.
To carry out the iteration this for loop describes, Python does the following: 1 Calls iter () to obtain an iterator for a 2 Calls next () repeatedly to obtain each item from the iterator in turn 3 Terminates the loop when next () raises the StopIteration exception More ...
The continue Statement: The continue statement in Python returns the control to the beginning of the while loop. The continue statement rejects all the remaining statements in the current iteration of the loop and moves the control back to the top of the loop. The continue statement can be used in both while and for loops.
The break statement in Python terminates the current loop and resumes execution at the next statement, just like the traditional break found in C. The most common use for break is when some external condition is triggered requiring a hasty exit from a loop. The break statement can be used in both while and for loops. Example:
There are two types of iteration: Definite iteration, in which the number of repetitions is specified explicitly in advance Indefinite iteration, in which the code block executes until some condition is met In Python, indefinite iteration is performed with a while loop.
You can create an iterator from the list. With this, you can mutate the loop items while looping:
it = iter(list1)
for i in it:
if i == 5:
next(it) # Does nothing, skips next item
else:
#do something
In case you're planning to use the value at i==5, you should do something before the evaluating the condition:
it = iter(list1)
for i in it:
#do something
if i == 5:
next(it) # Does nothing, skips next item
If you're doing this in a terminal, you should assign the next item to a variable as the terminal may force an autoprint on a dangling reference:
>>> list1 = [1, 2, 3, 4, 5, 6, 7]
>>> it = iter(list1)
>>> for i in it:
... print(i)
... if i == 5:
... j = next(it) # here
...
1
2
3
4
5
7
Just set a flag:
>>> i
[0, 1, 2, 3, 4, 5, 6, 7]
>>> skip = False
>>> for q in i:
... if skip:
... skip = False
... continue
... if q == 5:
... skip = True
... print(q)
...
0
1
2
3
4
5
7
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