all Python 3Byte sequencesfunction

bytes.isalpha

bytes — is* checks

Check that all bytes are ASCII letters and non-empty.

Syntax

b.isalpha(...)

Each byte is checked against A-Z and a-z only, so any non-Latin text run through .encode() comes back False — its UTF-8 bytes are above 127. If you mean letters in general rather than ASCII letters, decode to str first and call str.isalpha.

Examples

print(b'abc'.isalpha())   # → True
print(b'Hello'.isalpha())   # → True
print(b'abc1'.isalpha())   # → False
print(b'hi there'.isalpha())   # → False
print(b''.isalpha())   # → False
print('привет'.encode().isalpha())   # → False

See also

Open in the full glossarydocs.python.orgReport an inaccuracy