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How to make equivalency in Python?


How to make equivalency in Python?

By : user2951023
Date : November 17 2020, 11:58 AM
may help you . OK... if you have two csv files and the second has one column of B values:
code :
with open('test.csv') as f:
    line_values = [line.strip().split(',') for line in f.readlines()]
transposed_values = dict([(v.strip(), k) for k, v in line_values])
with open('test2.csv') as fi:
    with open('out.csv', 'w') as fo:
        for line in fi.readlines():
            B = line.strip()
            try:
                print >>fo, '{}, {}'.format(B, transposed_values[B])
            except KeyError:
                print >>fo, '{}, ?'.format(B)
4, 8
5, 64
6, 12
7, 54
8, 2
54
8
12
8
64
54
54, 7
8, 4
12, 6
8, 4
64, 5
54, 7


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Equivalency to TransparencyKey in WPF

Equivalency to TransparencyKey in WPF


By : Michal Poul
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further There is no equivalent.
Just use an image with transparent areas (so it has to be a PNG or GIF), set the WindowStyle to None, set the window's background to Transparent, and set AllowTransparency to true.
Developing a heuristic to test simple anonymous Python functions for equivalency

Developing a heuristic to test simple anonymous Python functions for equivalency


By : CareGiverPDM
Date : March 29 2020, 07:55 AM
To fix the issue you can do Edited to check whether external state will affect the sorting function as well as if the two functions are equivalent.
code :
import types
from opcode import *
_have_code = (types.MethodType, types.FunctionType, types.CodeType,
              types.ClassType, type)

def dis(x):
    """Disassemble classes, methods, functions, or code.

    With no argument, disassemble the last traceback.

    """
    if isinstance(x, types.InstanceType):
        x = x.__class__
    if hasattr(x, 'im_func'):
        x = x.im_func
    if hasattr(x, 'func_code'):
        x = x.func_code
    if hasattr(x, '__dict__'):
        items = x.__dict__.items()
        items.sort()
        for name, x1 in items:
            if isinstance(x1, _have_code):
                print >> out,  "Disassembly of %s:" % name
                try:
                    dis(x1)
                except TypeError, msg:
                    print >> out,  "Sorry:", msg
                print >> out
    elif hasattr(x, 'co_code'):
        disassemble(x)
    elif isinstance(x, str):
        disassemble_string(x)
    else:
        raise TypeError, \
              "don't know how to disassemble %s objects" % \
              type(x).__name__

def disassemble(co, lasti=-1):
    """Disassemble a code object."""
    code = co.co_code
    labels = findlabels(code)
    linestarts = dict(findlinestarts(co))
    n = len(code)
    i = 0
    extended_arg = 0
    free = None
    while i < n:
        c = code[i]
        op = ord(c)
        if i in linestarts:
            if i > 0:
                print >> out
            print >> out,  "%3d" % linestarts[i],
        else:
            print >> out,  '   ',

        if i == lasti: print >> out,  '-->',
        else: print >> out,  '   ',
        if i in labels: print >> out,  '>>',
        else: print >> out,  '  ',
        print >> out,  repr(i).rjust(4),
        print >> out,  opname[op].ljust(20),
        i = i+1
        if op >= HAVE_ARGUMENT:
            oparg = ord(code[i]) + ord(code[i+1])*256 + extended_arg
            extended_arg = 0
            i = i+2
            if op == EXTENDED_ARG:
                extended_arg = oparg*65536L
            print >> out,  repr(oparg).rjust(5),
            if op in hasconst:
                print >> out,  '(' + repr(co.co_consts[oparg]) + ')',
            elif op in hasname:
                print >> out,  '(' + co.co_names[oparg] + ')',
            elif op in hasjrel:
                print >> out,  '(to ' + repr(i + oparg) + ')',
            elif op in haslocal:
                print >> out,  '(' + co.co_varnames[oparg] + ')',
            elif op in hascompare:
                print >> out,  '(' + cmp_op[oparg] + ')',
            elif op in hasfree:
                if free is None:
                    free = co.co_cellvars + co.co_freevars
                print >> out,  '(' + free[oparg] + ')',
        print >> out

def disassemble_string(code, lasti=-1, varnames=None, names=None,
                       constants=None):
    labels = findlabels(code)
    n = len(code)
    i = 0
    while i < n:
        c = code[i]
        op = ord(c)
        if i == lasti: print >> out,  '-->',
        else: print >> out,  '   ',
        if i in labels: print >> out,  '>>',
        else: print >> out,  '  ',
        print >> out,  repr(i).rjust(4),
        print >> out,  opname[op].ljust(15),
        i = i+1
        if op >= HAVE_ARGUMENT:
            oparg = ord(code[i]) + ord(code[i+1])*256
            i = i+2
            print >> out,  repr(oparg).rjust(5),
            if op in hasconst:
                if constants:
                    print >> out,  '(' + repr(constants[oparg]) + ')',
                else:
                    print >> out,  '(%d)'%oparg,
            elif op in hasname:
                if names is not None:
                    print >> out,  '(' + names[oparg] + ')',
                else:
                    print >> out,  '(%d)'%oparg,
            elif op in hasjrel:
                print >> out,  '(to ' + repr(i + oparg) + ')',
            elif op in haslocal:
                if varnames:
                    print >> out,  '(' + varnames[oparg] + ')',
                else:
                    print >> out,  '(%d)' % oparg,
            elif op in hascompare:
                print >> out,  '(' + cmp_op[oparg] + ')',
        print >> out

def findlabels(code):
    """Detect all offsets in a byte code which are jump targets.

    Return the list of offsets.

    """
    labels = []
    n = len(code)
    i = 0
    while i < n:
        c = code[i]
        op = ord(c)
        i = i+1
        if op >= HAVE_ARGUMENT:
            oparg = ord(code[i]) + ord(code[i+1])*256
            i = i+2
            label = -1
            if op in hasjrel:
                label = i+oparg
            elif op in hasjabs:
                label = oparg
            if label >= 0:
                if label not in labels:
                    labels.append(label)
    return labels

def findlinestarts(code):
    """Find the offsets in a byte code which are start of lines in the source.

    Generate pairs (offset, lineno) as described in Python/compile.c.

    """
    byte_increments = [ord(c) for c in code.co_lnotab[0::2]]
    line_increments = [ord(c) for c in code.co_lnotab[1::2]]

    lastlineno = None
    lineno = code.co_firstlineno
    addr = 0
    for byte_incr, line_incr in zip(byte_increments, line_increments):
        if byte_incr:
            if lineno != lastlineno:
                yield (addr, lineno)
                lastlineno = lineno
            addr += byte_incr
        lineno += line_incr
    if lineno != lastlineno:
        yield (addr, lineno)

class FakeFile(object):
    def __init__(self):
        self.store = []
    def write(self, data):
        self.store.append(data)

a = lambda x : x
b = lambda x : x # True
c = lambda x : 2 * x
d = lambda y : 2 * y # True
e = lambda x : 2 * x
f = lambda x : x * 2 # True or False is fine, but must be stable
g = lambda x : 2 * x
h = lambda x : x + x # True or False is fine, but must be stable

funcs = a, b, c, d, e, f, g, h

outs = []
for func in funcs:
    out = FakeFile()
    dis(func)
    outs.append(out.store)

import ast

def outfilter(out):
    for i in out:
        if i.strip().isdigit():
            continue
        if '(' in i:
            try:
                ast.literal_eval(i)
            except ValueError:
                i = "(x)"
        yield i

processed_outs = [(out, 'LOAD_GLOBAL' in out or 'LOAD_DECREF' in out)
                            for out in (''.join(outfilter(out)) for out in outs)]

for (out1, polluted1), (out2, polluted2) in zip(processed_outs[::2], processed_outs[1::2]):
    print 'Bytecode Equivalent:', out1 == out2, '\nPolluted by state:', polluted1 or polluted2
MOD_WSGI : "SERVER_NAME"( of php) equivalency in Python or WSGI?

MOD_WSGI : "SERVER_NAME"( of php) equivalency in Python or WSGI?


By : user2347089
Date : March 29 2020, 07:55 AM
it helps some times The environ argument passed to the WSGI application handler contains the items normally found in $_SERVER in PHP, including a "SERVER_NAME" item.
code :
print >>sys.stderr, environ['SERVER_NAME']
Exponential Big-O Equivalency

Exponential Big-O Equivalency


By : Matt
Date : March 29 2020, 07:55 AM
Hope this helps The professor is correct. Their logic is as follows: 3^n = (2^log_2(3))^n = 2^(n*log_2(3)) = 2^O(n)
log_2(3) = z means "2 to the power of z gives me 3" and we are raising 2 to this exponent, so we get 3^n.
code :
If f(n) = 3^n and g(n) = 2^n 

The 3 in 2^(n*log_2(3)) must be coming from f(n)?
The 2 in 2^(n*log_2(3)) must be coming from g(n)'s base?
----> Is the log_2 a constant?? 
4^(n*log_2(7))

Where k = 7, and n >= 7 and 2 is the constant 'c'?
Should().Contain() with equivalency options

Should().Contain() with equivalency options


By : Prinal Vadgama
Date : March 29 2020, 07:55 AM
around this issue Unfortunately this is not yet possible in the current version. The extension points are there (see the EquivalencyValidator class), but the list of steps is currently private. Otherwise you could have replaced the EnumerableEquivalencyStep with your own implementation that provides the 'contains' behavior.
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