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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.

@havenwood
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@chris-martin Good point, I wouldn't. Except for just this. :P

@havenwood
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Finished the Ruby translation, but gosh the "45" to "3435" and vice-versa are fugly.

@kindall
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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
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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
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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
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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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