Python · Theory

count(string,begin,end)

Theory

211/268

count(string,begin,end)

count is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.

count(string,begin,end) — output — 3. Letter a appears three times.

Fresher trap: writing s.count() and expecting s to update. Strings are immutable. Write s = s.count(...) if you need the new value (when it returns a string).

Exam tip

Call count on one real word and say what prints.

Example

# count(string,begin,end)
print("banana".count("a"))

count(string,begin,end) — output: 3. Letter a appears three times.

Short notes

Defcount works on str.
Rulecount usually returns a new string.
Trapcount does not change the original string in place.

Python · Theory

count(string,begin,end)

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Theory

211/268

count(string,begin,end)

count is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.

count(string,begin,end) — output — 3. Letter a appears three times.

Fresher trap: writing s.count() and expecting s to update. Strings are immutable. Write s = s.count(...) if you need the new value (when it returns a string).

Exam tip

Call count on one real word and say what prints.

Example

# count(string,begin,end)
print("banana".count("a"))

count(string,begin,end) — output: 3. Letter a appears three times.

Short notes

Defcount works on str.
Rulecount usually returns a new string.
Trapcount does not change the original string in place.

count(string,begin,end)

Example

Short notes

Questions

count(string,begin,end)

Example

Short notes

Questions