str.count(sub[, start[, end]]) Return the number of non-overlapping occurrences of substring sub in the range [start, end]. Optional arguments start and end are interpreted as in slice notation.
More on sorting by keys.
I believe this is what you want: Example:
Non-numpy way: Use collections.Counter;
If you only want one item’s count, use the count method: Important Note regarding count performance Don’t use this if you want to count multiple items. Calling count in a loop requires a separate pass over the list for every count call, which can be catastrophic for performance. If you want to count all items, or even just multiple items, use Counter, … Read more
PDO fetch returns false on failure. So you need to check this case too:
You can just use table(): Then you can subset it: Or convert it into a data.frame if you’re more comfortable working with that: