def ishex(c):
    return '0' <= c <= '9' or 'a' <= c <= 'f' or 'A' <= c <= 'F'
Return true if the character 'c' is a hexadecimal digit.
dataset/ETHPy150Open LarsMichelsen/pmatic/ccu_pkg/python/lib/python2.7/quopri.py/ishex