bytes.islower() bytearray.islower() Return true if there is at least one lowercase ASCII character in the sequence and no uppercase ASCII characters, false otherwise. For example: >>> b'hello world'.islower() True >>> b'Hello world'.islower() False Lowercase ASCII characters are those byte values in the sequence b'abcdefghijklmnopqrstuvwxyz'. Uppercase ASCII characters are those byte values in the sequence b'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.

bytes.isdigit() bytearray.isdigit() Return true if all bytes in the sequence are ASCII decimal digits and the sequence is not empty, false otherwise. ASCII decimal digits are those byte values in the sequence b'0123456789'. For example: >>> b'1234'.isdigit() True >>> b'1.23'.isdigit() False

bytes.isalpha() bytearray.isalpha() Return true if all bytes in the sequence are alphabetic ASCII characters and the sequence is not empty, false otherwise. Alphabetic ASCII characters are those byte values in the sequence b'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'. For example: >>> b'ABCabc'.isalpha() True >>> b'ABCabc1'.isalpha() False

bytes.isalnum() bytearray.isalnum() Return true if all bytes in the sequence are alphabetical ASCII characters or ASCII decimal digits and the sequence is not empty, false otherwise. Alphabetic ASCII characters are those byte values in the sequence b'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'. ASCII decimal digits are those byte values in the sequence b'0123456789'. For example: >>> b'ABCabc1'.isalnum() True >>> b'ABC abc1'.isalnum() False

bytes.index(sub[, start[, end]]) bytearray.index(sub[, start[, end]]) Like find(), but raise ValueError when the subsequence is not found. The subsequence to search for may be any bytes-like object or an integer in the range 0 to 255. Changed in version 3.3: Also accept an integer in the range 0 to 255 as the subsequence.

bytes.hex() Return a string object containing two hexadecimal digits for each byte in the instance. >>> b'\xf0\xf1\xf2'.hex() 'f0f1f2' New in version 3.5.

classmethod bytes.fromhex(string) This bytes class method returns a bytes object, decoding the given string object. The string must contain two hexadecimal digits per byte, with ASCII spaces being ignored. >>> bytes.fromhex('2Ef0 F1f2 ') b'.\xf0\xf1\xf2'

bytes.find(sub[, start[, end]]) bytearray.find(sub[, start[, end]]) Return the lowest index in the data where the subsequence sub is found, such that sub is contained in the slice s[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 if sub is not found. The subsequence to search for may be any bytes-like object or an integer in the range 0 to 255. Note The find() method should be used only if you need to know the position of sub. To check if sub is a

bytes.expandtabs(tabsize=8) bytearray.expandtabs(tabsize=8) Return a copy of the sequence where all ASCII tab characters are replaced by one or more ASCII spaces, depending on the current column and the given tab size. Tab positions occur every tabsize bytes (default is 8, giving tab positions at columns 0, 8, 16 and so on). To expand the sequence, the current column is set to zero and the sequence is examined byte by byte. If the byte is an ASCII tab character (b'\t'), one or more space char

bytes.endswith(suffix[, start[, end]]) bytearray.endswith(suffix[, start[, end]]) Return True if the binary data ends with the specified suffix, otherwise return False. suffix can also be a tuple of suffixes to look for. With optional start, test beginning at that position. With optional end, stop comparing at that position. The suffix(es) to search for may be any bytes-like object.