Run a function if loop executed

Question

How would you write this code elegantly?

for i in get_generator():
    # ...

# if loop executed then call the function
some_function()

@mkrieger1 `for i ...` might not execute then I don't want to run the function — Kanony, Aug 12 '22 at 09:19
@mkrieger1 I think what the OP meant was how would he 'elegantly' check if the ```for loop``` actually ran and if so, run ```some_function()```. — ewokx, Aug 12 '22 at 09:19
What do you mean by "might not execute"? If you write it, it will execute. — mkrieger1, Aug 12 '22 at 09:19
The question seems to be whether the generator yielded at least one item and thus the loop body has executed at least once. — a_guest, Aug 12 '22 at 09:20

score 2 · Answer 1 · answered Aug 12 '22 at 09:19

2

If your problem is to detect if there were any items returned by the generator (did the body of the loop execute at least once):

loop_executed = False
for i in get_generator():
    loop_executed = True
    # ...

if loop_executed:
    some_function()

answered Aug 12 '22 at 09:19

chthonicdaemon

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score 0 · Answer 2 · answered Aug 12 '22 at 09:20

loop_executed = False
for i in get_generator():
  loop_executed = True
  # ...
    
# if loop executed, then call the function
if loop_executed:
  some_function()

Alternatively, if this get_generator call is not dynamic and does not change its state you can also just do something like

for i in get_generator():
    # ...

# if loop executed, then call the function
if get_generator() is not None: # or empty or whatever
    some_function()

Run a function if loop executed

2 Answers2