How do I count the number of times a value/string etc. occures in a field (using field calculator)?

In my example I want to count the number of times the letter "H" occures in a field; see attached image.

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Use String count:

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.

Example in Field Calculator with Python Parser:

tmp =


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