I'm trying to increment a for loop within itself if a certain condition is met, as shown in the code below
for i in range(0,5):
if condition == True:
i+=1
print(i)
If it runs as I want it to, the output should be: "1 3 5". Instead, the output is "0 1 2 3 4". Can anyone help me with this?
You have to do with a while loop what the for was doing for you.
i = 0
while i < 5:
if condition == True:
i+=1
print(i)
i += 1
When you do for i in xxx:, the xxx is constructed before the loop ever runs. It is going to feed new values to i regardless of what happens inside the loop.
You can skip iterator elements by creating and controlling the iterator yourself (Attempt This Online!):
condition = True
it = iter(range(0,5))
for i in it:
if condition == True:
i+=1
next(it, None)
print(i)
Though you might be better off with a while loop.
Like Tim was mentioning, when you're using a for loop, the variable i is being 're-generated' at the start of each iteration, regardless of what its value was in the previous iteration. It's sort of a placeholder iterator so trying to replace it and print it's new value won't work. You could work with the iterators current value by doing something like:
for i in range(0,3):
if condition == True:
print(i+1)
Essentially, would have to use a while loop if you were intending to actually store or be able to modify the previous state of the variable i
conditionis never True. It's always helpful to create an example that people can actually run.continuestatement when the condition isFalse. Otherwisewhileis the way to go as others have already stated