all Python 3Byte sequencesfunction

bytes.istitle

bytes — is* checks

Check that the bytes are title-cased.

Syntax

b.istitle(...)

The rule is: every cased letter must be upper-case when preceded by a non-letter and lower-case when preceded by a letter. That produces surprises around separators: b'Hello2World' is title-cased (the digit starts a new "word"), while b"Don't" is not, because the apostrophe breaks the word and istitle() expects b"Don'T" — which is exactly what .title() produces. Using it to validate human names or headlines is a bad idea.

Examples

print(b'Hello World'.istitle())   # → True
print(b'hello world'.istitle())   # → False
print(b'HELLO WORLD'.istitle())   # → False
print(b'Hello2World'.istitle())   # → True
print(b''.istitle())   # → False
print(b'hello world'.title())   # → b'Hello World'

See also

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