calculator 4 opérations yoda style :)

calc4.py

#!/usr/bin/python3.7
from functools import reduce
crush_stack=object()
stack=[]
dispatch={
    lambda x: True :
        print,
    str.isdigit :
        lambda x: stack.append(int(x)),
    lambda x: x in '+*/-' :
        lambda op: stack.insert(
                        0,
                        int(reduce(
                            { '+' : int.__add__,
                              '*' : int.__mul__,
                              '-' : int.__sub__,~
                              '/':int.__truediv__}[op],
                            stack
                        ))
                    ) or crush_stack,
}

for c in '10 1 + 0 * 2 32 + 13 * 2 - 2 / '.split():
    for pred, action in dispatch.items():
        if pred(c) and action(c) is crush_stack:
            stack=stack[:1]
            print("=%d" % stack[0])
"""                
10
1
+
=11
0
*
=0
2
32
+
=34
13
*
=442
2
-
=440
2
/
=220
"""