code.Sym 

 1import math
 2
 3class Sym:
 4    def __init__(self, c="", s=0):
 5        self.n = 0                  # items seen
 6        self.at = c if c else 0     # column  position
 7        self.name = s or ""         # column name
 8        self._has = {}              # kept data
 9
10    def add(self, v):
11        if v != "?":
12            self.n += 1
13            if v in self._has:
14                self._has[v]+=1
15            else:
16                self._has[v] = 1
17
18    def mid(self):
19        most = -1
20        for k, v in self._has.items():
21            if v > most:
22                mode = k
23                most = v
24        return mode
25
26    def div(self):
27        def fun(p):
28            return p * math.log(p, 2)
29        e = 0
30        for _, _n in self._has.items():
31            if _n > 0:
32                e = e - fun(_n/self.n)
33        return e
class Sym: 
 4class Sym:
 5    def __init__(self, c="", s=0):
 6        self.n = 0                  # items seen
 7        self.at = c if c else 0     # column  position
 8        self.name = s or ""         # column name
 9        self._has = {}              # kept data
10
11    def add(self, v):
12        if v != "?":
13            self.n += 1
14            if v in self._has:
15                self._has[v]+=1
16            else:
17                self._has[v] = 1
18
19    def mid(self):
20        most = -1
21        for k, v in self._has.items():
22            if v > most:
23                mode = k
24                most = v
25        return mode
26
27    def div(self):
28        def fun(p):
29            return p * math.log(p, 2)
30        e = 0
31        for _, _n in self._has.items():
32            if _n > 0:
33                e = e - fun(_n/self.n)
34        return e
Sym(c='', s=0) 
5    def __init__(self, c="", s=0):
6        self.n = 0                  # items seen
7        self.at = c if c else 0     # column  position
8        self.name = s or ""         # column name
9        self._has = {}              # kept data
def add(self, v): 
11    def add(self, v):
12        if v != "?":
13            self.n += 1
14            if v in self._has:
15                self._has[v]+=1
16            else:
17                self._has[v] = 1
def mid(self): 
19    def mid(self):
20        most = -1
21        for k, v in self._has.items():
22            if v > most:
23                mode = k
24                most = v
25        return mode
def div(self): 
27    def div(self):
28        def fun(p):
29            return p * math.log(p, 2)
30        e = 0
31        for _, _n in self._has.items():
32            if _n > 0:
33                e = e - fun(_n/self.n)
34        return e