char_set="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!$%&/()=?+*'#-_.:,;<>|~\\}][{ "

def get_single_char():
    returnvalue= random.randint(0,255)
    if chr(returnvalue) in char_set:
        return chr(returnvalue)
    else:
        get_single_char()

// the usable charset
std::string charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!$%&/()=?+*'#-_.:,;<>|~\\}][{ ";

unsigned char getsinglechar();
std::string makepasswd(unsigned int letters);

// randomize char
unsigned char getsinglechar()
{
    char returnvalue = rand() % 255;
    if(charset.find(returnvalue) != std::string::npos)
    {
        return returnvalue;
    }
    else
    {
        return getsinglechar();
    }
}

// password routine
std::string makepasswd(unsigned int letters)

>>> import random
>>> char_set="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!$%&/()=?+*'#-_.:,;<>|~\\}][{ "
>>> def get_single_char():
...   return random.choice(char_set)

>>> "".join(get_single_char() for _ in range(20))
'%sFM*nuEk= O}>KSvg{/'

import random; print("".join(random.choice("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!$%&/()=?+*'#-_.:,;<>|~\\}][{ ") for _ in range(20)))

import random as R,string as S;print("".join(R.choice(S.ascii_letters+S.digits+"!$%&/()=?+*'#-_.:,;<>|~\\}][{ ")for _ in range(20)))