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In a Python for loop that iterates over a list we can write:
for item in list: print item and it neatly goes through all the elements in the list. Is there a way to know within the loop how many times I've been looping so far? For instance, I want to take a list and after I've processed ten elements I want to do something with them.
The alternatives I thought about would be something like:
count=0 for item in list: print item count +=1 if count % 10 == 0: print 'did ten' Or:
for count in range(0,len(list)): print list[count] if count % 10 == 0: print 'did ten' Is there a better way (just like the for item in list) to get the number of iterations so far?
899
Using For Loop for loop is used to iterate over a sequence of values. To get the number of elements in the list, you'll iterate over the list and increment the counter variable during each iteration. Once the iteration is over, you'll return the count variable, which has the total number of elements in the list.
To count statements in nested loops, one just separates the counts for the iterations of the outer loop, then adds them: count (nested loop) = count (1st iteration of the outer loop) + count (2nd iteration of the outer loop) + … + count (last iteration of the outer loop)
Python's enumerate() lets you write Pythonic for loops when you need a count and the value from an iterable. The big advantage of enumerate() is that it returns a tuple with the counter and value, so you don't have to increment the counter yourself.
The pythonic way is to use enumerate:
for idx,item in enumerate(list): If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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