Python · Theory

find(substring ,beginIndex, endIndex)

Theory

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find(substring ,beginIndex, endIndex)

find 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.

find(substring ,beginIndex, endIndex) — output: 1 then -1. Missing → -1, not error.

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

Exam tip

Call find on one real word and say what prints.

Example

# find(substring ,beginIndex, endIndex)
print("Asha".find("s"))
print("Asha".find("z"))

find(substring ,beginIndex, endIndex) — output: 1 then -1. Missing → -1, not error.

Short notes

Deffind works on str.
Rulefind usually returns a new string.
Trapfind does not change the original string in place.

Python · Theory

find(substring ,beginIndex, endIndex)

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Theory

215/268

find(substring ,beginIndex, endIndex)

find 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.

find(substring ,beginIndex, endIndex) — output: 1 then -1. Missing → -1, not error.

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

Exam tip

Call find on one real word and say what prints.

Example

# find(substring ,beginIndex, endIndex)
print("Asha".find("s"))
print("Asha".find("z"))

find(substring ,beginIndex, endIndex) — output: 1 then -1. Missing → -1, not error.

Short notes

Deffind works on str.
Rulefind usually returns a new string.
Trapfind does not change the original string in place.

find(substring ,beginIndex, endIndex)

Example

Short notes

Questions

find(substring ,beginIndex, endIndex)

Example

Short notes

Questions