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# Nurdok/python_conversion.md

Last active December 16, 2022 03:45
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Python Conversion

## Python Number Conversion Chart

From To Expression
45 "45" str(data)
45 "101101" bin(data)
45 "2D" hex(data)
45 "\x00\x00\x00\x2d" struct.pack('!i', data)
"45" 45 int(data)
"45" "3435" data.encode('hex')
"101101" 45 int(data, 2)
"2D" 45 int(data, 16)
"2D" "\x2d" binascii.unhexlify(data) or data.decode('hex')
"\x00\x00\x00\x2d" 45 struct.unpack('!i', data)[0]
"\x2d" "2D" binascii.hexlify(data)
"3435" "45" data.decode('hex')

Comments are welcome here or in my original blog post regarding this table.

### kindall commented Apr 20, 2013

@chris-martin In Python 2.x, `str` is basically a byte array. In Python 3.x, `str` is a Unicode string. We're looking at Python 2.x here, it seems.

### zwegner commented Apr 20, 2013

@Niggler If you don't know what base it's in, you can specify a base of 0:
int('055', 0) -> 45 or int('0x55', 0) -> 85

### marcinantkiewicz commented Apr 20, 2013

I'm not sure what to do with "\x00\x00\x00\x2d". What is this encoding (and why would you want it)?

It's a 4-byte int in the network byte order.

### plq commented Apr 21, 2013

@chris-martin, @havenwood to give you a real-world example for the hex encoding ("45" => "3435"): http://books.xmlschemata.org/relaxng/ch19-77143.html

this is quite inefficient, I know, but you sometimes need it for backwards compatibility.

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