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Rust, Python: Similar to Base64, but contains only alphanumeric characters. Base64: Arbitrary: 75%: awk Archived 2014-12-29 at the Wayback Machine, C, C (2), Delphi, Go, Python, many others: An early and still-popular encoding, first specified as part of RFC 989 in 1987 Base85: Arbitrary: 80%: C, Python, Python (2) Revised version of Ascii85 ...
One attempt to solve the problem was the xxencode format, which used only alphanumeric characters and the plus and minus symbols. More common today is the Base64 format, which is based on the same concept of alphanumeric-only as opposed to ASCII 32–95. All three formats use 6 bits (64 different characters) to represent their input data.
An abstract character repertoire (ACR) is the full set of abstract characters that a system supports. Unicode has an open repertoire, meaning that new characters will be added to the repertoire over time. A coded character set (CCS) is a function that maps characters to code points (each code point represents one character). For example, in a ...
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the ...
The meaning of "format" varies. Typically only finite sets of characters are used; numeric, alphabetic or alphanumeric. For example: Encrypting a 16-digit credit card number so that the ciphertext is another 16-digit number. Encrypting an English word so that the ciphertext is another English word.
In Python, if a name is intended to be "private", it is prefixed by one or two underscores. Private variables are enforced in Python only by convention. Names can also be suffixed with an underscore to prevent conflict with Python keywords. Prefixing with double underscores changes behaviour in classes with regard to name mangling.
Using those four decimal numbers as indices for the Base64 alphabet, the corresponding ASCII characters are TWFu. If there are only two significant input octets (e.g., 'Ma'), or when the last input group contains only two octets, all 16 bits will be captured in the first three Base64 digits (18 bits); the two least significant bits of the last ...
The BCD code for this character is 77 8 in some BCD variants. The groupmark was proposed for Unicode standardization in 2015, [9] and was assigned to value U+2BD2 ⯒ GROUP MARK. Functionally this corresponds to the EBCDIC IGS character (ASCII GS), X'1D'. It is now in Unicode 10.0 at this position, but only the Symbola and Unifont fonts support it.