Question

lambda x : '%x' % x

the function is decimal to hexadecimal,what the principle? I am python newbie,thanks in advance

Answer 1

In string-format notation, ‘%x’ is a placedholder for hexadecimal output.

The function takes a value and returns it formatted as a hexadecimal string.

It’s not “decimal to hexadecimal”, but “return (whatever you’re given) as a string in hexadecimal notation”.

For example,

print '%x' % 0b11111111   # -> 'ff'  (from binary)
print '%x' % 0377         # -> 'ff'  (from octal)
print '%x' % 255          # -> 'ff'  (from decimal)
print '%x' % 0xff         # -> 'ff'  (from hex)