我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用random.expovariate()。
def _fix(self, n=0): o = random.choice(self.objlist) if issubclass(o, ASN1_INTEGER): return o(int(random.gauss(0,1000))) elif issubclass(o, ASN1_IPADDRESS): z = RandIP()._fix() return o(z) elif issubclass(o, ASN1_STRING): z = int(random.expovariate(0.05)+1) return o("".join([random.choice(self.chars) for i in range(z)])) elif issubclass(o, ASN1_SEQUENCE) and (n < 10): z = int(random.expovariate(0.08)+1) return o(map(lambda x:x._fix(n+1), [self.__class__(objlist=self.objlist)]*z)) return ASN1_INTEGER(int(random.gauss(0,1000))) ############## #### ASN1 #### ##############
def _think(self): try: if len(self.conns) < self.desired_conns and len(self.attempts) < self.max_attempts and self.node.addr_store: (host, port), = self.node.get_good_peers(1) if self._host_to_ident(host) in self.attempts: pass elif host in self.node.bans and self.node.bans[host] > time.time(): pass else: #print 'Trying to connect to', host, port reactor.connectTCP(host, port, self, timeout=5) except: log.err() return random.expovariate(1/1)
def _think(self): try: if len(self.addr_store) < self.preferred_storage and self.peers: random.choice(self.peers.values()).send_getaddrs(count=8) except: log.err() return random.expovariate(1/20)
def _fix(self, n=0): o = random.choice(self.objlist) if issubclass(o, ASN1_INTEGER): return o(int(random.gauss(0,1000))) elif issubclass(o, ASN1_IPADDRESS): z = RandIP()._fix() return o(z) elif issubclass(o, ASN1_STRING): z = int(random.expovariate(0.05)+1) return o(bytes([random.choice(self.chars) for i in range(z)])) elif issubclass(o, ASN1_SEQUENCE) and (n < 10): z = int(random.expovariate(0.08)+1) # return o(map(lambda x:x._fix(n+1), [self.__class__(objlist=self.objlist)]*z)) return o([ x._fix(n+1) for x in [self.__class__(objlist=self.objlist)]*z]) return ASN1_INTEGER(int(random.gauss(0,1000))) ############## #### ASN1 #### ##############
def test_explicit_from_float(self): r = Decimal(0.1) self.assertEqual(type(r), Decimal) self.assertEqual(str(r), '0.1000000000000000055511151231257827021181583404541015625') self.assertTrue(Decimal(float('nan')).is_qnan()) self.assertTrue(Decimal(float('inf')).is_infinite()) self.assertTrue(Decimal(float('-inf')).is_infinite()) self.assertEqual(str(Decimal(float('nan'))), str(Decimal('NaN'))) self.assertEqual(str(Decimal(float('inf'))), str(Decimal('Infinity'))) self.assertEqual(str(Decimal(float('-inf'))), str(Decimal('-Infinity'))) self.assertEqual(str(Decimal(float('-0.0'))), str(Decimal('-0'))) for i in range(200): x = random.expovariate(0.01) * (random.random() * 2.0 - 1.0) self.assertEqual(x, float(Decimal(x))) # roundtrip
def test_from_float(self): class MyDecimal(Decimal): pass r = MyDecimal.from_float(0.1) self.assertEqual(type(r), MyDecimal) self.assertEqual(str(r), '0.1000000000000000055511151231257827021181583404541015625') bigint = 12345678901234567890123456789 self.assertEqual(MyDecimal.from_float(bigint), MyDecimal(bigint)) self.assertTrue(MyDecimal.from_float(float('nan')).is_qnan()) self.assertTrue(MyDecimal.from_float(float('inf')).is_infinite()) self.assertTrue(MyDecimal.from_float(float('-inf')).is_infinite()) self.assertEqual(str(MyDecimal.from_float(float('nan'))), str(Decimal('NaN'))) self.assertEqual(str(MyDecimal.from_float(float('inf'))), str(Decimal('Infinity'))) self.assertEqual(str(MyDecimal.from_float(float('-inf'))), str(Decimal('-Infinity'))) self.assertRaises(TypeError, MyDecimal.from_float, 'abc') for i in range(200): x = random.expovariate(0.01) * (random.random() * 2.0 - 1.0) self.assertEqual(x, float(MyDecimal.from_float(x))) # roundtrip
def get_cookie(self,query): """ @summary: ??cookie @param query: ????????? @return: ??cookie?? """ cookies={} i=0 while True: cookie = cookielib.CookieJar() handler=urllib2.HTTPCookieProcessor(cookie) opener = urllib2.build_opener(handler) response = opener.open(self._search_url.format(query)) # ???????????????cookie for item in cookie: # ???????????cookie????SNUID????????????? # ???SNUID???cookie????cookie??????????? if("SNUID" in item.name): cookies[item.name]=item.value return cookies if(i>3): # ????3???????????cookie????IP????????????cookie?????????? spider_logger.error("Can't get cookies when searching {0} !".format(query)) return cookies i=i+1 time.sleep(10*random.expovariate(1)) # ?????????????????????????????
def _fix(self, n=0): o = random.choice(self.objlist) if issubclass(o, ASN1_INTEGER): return o(int(random.gauss(0,1000))) elif issubclass(o, ASN1_IPADDRESS): z = RandIP()._fix() return o(z) elif issubclass(o, ASN1_STRING): z = int(random.expovariate(0.05)+1) return o("".join(random.choice(self.chars) for _ in xrange(z))) elif issubclass(o, ASN1_SEQUENCE) and (n < 10): z = int(random.expovariate(0.08)+1) return o([self.__class__(objlist=self.objlist)._fix(n + 1) for _ in xrange(z)]) return ASN1_INTEGER(int(random.gauss(0,1000))) ############## #### ASN1 #### ##############
def test_explicit_from_float(self): Decimal = self.decimal.Decimal r = Decimal(0.1) self.assertEqual(type(r), Decimal) self.assertEqual(str(r), '0.1000000000000000055511151231257827021181583404541015625') self.assertTrue(Decimal(float('nan')).is_qnan()) self.assertTrue(Decimal(float('inf')).is_infinite()) self.assertTrue(Decimal(float('-inf')).is_infinite()) self.assertEqual(str(Decimal(float('nan'))), str(Decimal('NaN'))) self.assertEqual(str(Decimal(float('inf'))), str(Decimal('Infinity'))) self.assertEqual(str(Decimal(float('-inf'))), str(Decimal('-Infinity'))) self.assertEqual(str(Decimal(float('-0.0'))), str(Decimal('-0'))) for i in range(200): x = random.expovariate(0.01) * (random.random() * 2.0 - 1.0) self.assertEqual(x, float(Decimal(x))) # roundtrip
def test_explicit_context_create_from_float(self): Decimal = self.decimal.Decimal nc = self.decimal.Context() r = nc.create_decimal(0.1) self.assertEqual(type(r), Decimal) self.assertEqual(str(r), '0.1000000000000000055511151231') self.assertTrue(nc.create_decimal(float('nan')).is_qnan()) self.assertTrue(nc.create_decimal(float('inf')).is_infinite()) self.assertTrue(nc.create_decimal(float('-inf')).is_infinite()) self.assertEqual(str(nc.create_decimal(float('nan'))), str(nc.create_decimal('NaN'))) self.assertEqual(str(nc.create_decimal(float('inf'))), str(nc.create_decimal('Infinity'))) self.assertEqual(str(nc.create_decimal(float('-inf'))), str(nc.create_decimal('-Infinity'))) self.assertEqual(str(nc.create_decimal(float('-0.0'))), str(nc.create_decimal('-0'))) nc.prec = 100 for i in range(200): x = random.expovariate(0.01) * (random.random() * 2.0 - 1.0) self.assertEqual(x, float(nc.create_decimal(x))) # roundtrip
def do_churn(self): """Simulate churn: delete and add nodes from/to the network.""" nAdd = int(random.expovariate(self._lamdbaAdd) + 0.5) nDel = int(random.expovariate(self._lamdbaDel) + 0.5) # kill nDel non-dead nodes at random. random.shuffle(self._wholenet) nkilled = 0 for node in self._wholenet: if nkilled == nDel: break if not node._dead: node.kill() nkilled += 1 # add nAdd new nodes. for n in xrange(self._total, self._total+nAdd): node = Node("node%d"%n, port=_randport(), evil=random.random() < self._pevil) self._total += 1
def sim_configuration(env, num_machines, washing_time, arrival_time): ''' In this routine: washing machines are created, an initial number of vehicles (2) and then vehicles arrive at a rate of 1 / arrival_time''' # Create a washing machine machine = WashingMachine(env, num_machines, washing_time) # 2 vehicles are created and put in to the queue print('In the queue there are already 2 vehicles') for i in range(2): env.process(vehicle(env, 'Vehicle {0}'.format(i), machine)) # While the machine runs vehicles arrive at a rate of 1 / arrival_time while True: yield env.timeout(round(random.expovariate(1 / arrival_time))) i += 1 env.process(vehicle(env, 'Vehicle {0}'.format(i), machine)) # Simulation configuration # random.seed(RANDOM_SEED) # Simulation environment creation
def check_user(user: User, password: str) -> bool: hashpass, salt = user_info[user].hashed_password target_hash_pass = hash_password(password, salt)[0] sleep(random.expovariate(10)) return secrets.compare_digest(hashpass, target_hash_pass)
def _fix(self): return self.base+int(round(random.expovariate(self.lambd)))
def test_sleep(self): for i in xrange(10): length = random.expovariate(1/0.1) start = time.time() yield deferral.sleep(length) end = time.time() assert length <= end - start <= length + 0.1
def test_all(self): for test in ['', 'a', 'b', 'abc', 'abc'*50, 'hello world']: #print test #print sha256.sha256(test).hexdigest() #print hashlib.sha256(test).hexdigest() #print assert sha256.sha256(test).hexdigest() == hashlib.sha256(test).hexdigest() def random_str(l): return ''.join(chr(random.randrange(256)) for i in xrange(l)) for length in xrange(150): test = random_str(length) a = sha256.sha256(test).hexdigest() b = hashlib.sha256(test).hexdigest() assert a == b for i in xrange(100): test = random_str(int(random.expovariate(1/100))) test2 = random_str(int(random.expovariate(1/100))) a = sha256.sha256(test) a = a.copy() a.update(test2) a = a.hexdigest() b = hashlib.sha256(test) b = b.copy() b.update(test2) b = b.hexdigest() assert a == b
def get_good_peers(self, max_count): t = time.time() return [x[0] for x in sorted(self.addr_store.iteritems(), key=lambda (k, (services, first_seen, last_seen)): -math.log(max(3600, last_seen - first_seen))/math.log(max(3600, t - last_seen))*random.expovariate(1) )][:max_count]
def compute_duration(previous_action): """Compute action duration using exponential distribution""" if previous_action in ['leave garage', 'drop off passenger']: # new state is prowling interval = SEARCH_DURATION elif previous_action == 'pick up passenger': # new state is trip interval = TRIP_DURATION elif previous_action == 'going home': interval = 1 else: raise ValueError('Unknown previous_action: %s' % previous_action) return int(random.expovariate(1/interval)) + 1
def compute_delay(interval): """Compute action delay using exponential distribution""" return int(random.expovariate(1/interval)) + 1 # BEGIN TAXI_PROCESS
