Can anyone explain ( for x in str) doing it mean running in background in this program ?

Question

https://code.sololearn.com/cR6vUKaplg5E/?ref=app

Answer 1

Try not to use str, as its used in python to change data to a string.

Anyways, you created the string called: str

a for statement is used to go through elements. If you think of strings as a list of characters and not just one group of letters it becomes easier.

thats also why correct variable names should be used:

for x in str:
...
# bad ^^^

# better vvv
for letter in str:
...

It literally just goes through every character in the array of characters you call str.

Answer 2

This gives the same result without loops or variables
print("o ooo oooooo o o o o o o o o o o".count("o"))

Answer 3

Jan Markus
Because count() is not a built-in function. It is a method on the str type.
https://docs.python.org/3/library/stdtypes.html#str.count

Answer 4

Jan Markus , XXX is right. The count method also works on lists e.g. print([1, 2, 2, 3].count(2)) and tuples, but not dictionaries or generators.