In [ ]:
a = None
if a is None:
print('nulo')
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a = True
b = False
c = True
print(a == b)
print(a == c)
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a, b, c = True, False, True
print(a == b)
print(a == c)
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1 + 2
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type(1)
In [ ]:
type(1.2)
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1 // 2
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1 / 2
In [ ]:
1 / 2.0
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from __future__ import division
1 / 2
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2 ** 3
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2 ** 0.5
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import math
math.sqrt(2)
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import random
print(random.random())
print(random.randint(1,10)) # intervalo fechado
print(random.randrange(1,10))
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single_quoted_string = 'Data Science'
single_quoted_string
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repr(single_quoted_string)
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len(single_quoted_string)
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type(single_quoted_string)
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single_quoted_string.upper()
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single_quoted_string.lower()
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str1 = 'Hoje_vai_chover_novamente.'.replace('_', ' ')
print(str1)
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double_quoted_string = "data science"
print(double_quoted_string)
print(repr(double_quoted_string))
double_quoted_string
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tab_string = "\t" # representa o caracter 'tab'
print(tab_string)
print(repr(tab_string))
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not_tab_string = r"\t" # representa os caracteres '\' e 't'
print(not_tab_string)
print(repr(not_tab_string))
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multi_line_string = """linha 1.
linha 2
linha 3"""
print(multi_line_string)
print(repr(multi_line_string))
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'Repete ' * 5
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"%d/%d/%d" % (2, 4, 6)
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"%s/%s/%s" % (2, 4, 6)
In [ ]:
"{}/{}/{}".format(2, 4, 6)
In [ ]:
"{:2d}/{:2d}/{:2d}".format(2, 4, 16)
In [ ]:
"{:02d}/{:02d}/{:02d}".format(2, 4, 16)
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'{:.2f}'.format(99.8765)
In [ ]:
'{:.0f}'.format(99.8765)
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'%05d' % (99)
In [ ]:
'{:05d}'.format(99)
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' Hello '.strip()
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' Hello '.lstrip()
In [ ]:
' Hello '.rstrip()
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from datetime import datetime
import time
inicio = datetime.now()
print(inicio)
for i in range(2):
time.sleep(1)
fim = datetime.now()
print(fim)
print("Tempo de execução: {}".format(fim - inicio))
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lista = [1, 2, 3, 4, 5]
print(lista)
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lista[2]
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lista[-1] # último elemento
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lista[1:3]
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a, b = lista[1:3]
a, b
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lista[:3] # 3 primeiros elementos
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lista[-2:] # 2 últimos elementos
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lista[1:-1] # do segundo ao penúltimo elemento
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len(lista)
In [ ]:
sum(lista)
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10 in lista
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5 in lista
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lista.append(7)
lista.append(6)
lista.append(7)
lista
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lista.remove(7) # remove o primeiro elemento cujo valor é 7
lista
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lista.extend([8, 9, -10])
lista
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lista2 = lista # lista2 referencia lista
lista2[-1] = 10
print(lista)
print(lista2)
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lista3 = lista[:] # lista3 é uma nova lista com o mesmo conteúdo de lista
lista3[-1] = -10
print(lista)
print(lista3)
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print(range(5))
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print(range(2, 10, 2))
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print(range(5, 0, -1))
In [ ]:
lista4 = [-4, 1, -2, 3]
print(sorted(lista4)) # ordena sem alterar a lista
print(sorted(lista4, reverse=True))
print(sorted(lista4, key=abs))
print(lista4)
In [ ]:
lista4.sort() # altera a lista original
print(lista4)
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a = ['a', 'casa', 'está', 'muito', 'bem', 'organizada']
print(' '.join(a))
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import random
random.shuffle(a)
print(a)
random.shuffle(a)
print(a)
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random.choice(a) # com repetição
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# Loteria
numeros = range(1, 100)
random.sample(numeros, 5) # sem repetição
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quadrados = [x * x for x in range(5)]
print(quadrados)
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# conta quantos elementos da lista são maiores que 4
sum([1 for x in quadrados if x > 4])
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matriz = [ [1, 2, 3],
[4, 5, 6],
[7, 8, 9] ]
print(matriz)
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tupla = (1, 2, 3, 4)
print(tupla)
In [ ]:
dicionario = { 'nome': 'Fulano', 'sobrenome': 'Da Silva' }
print(dicionario['nome'])
print(dicionario['sobrenome'])
In [ ]:
dicionario.keys()
In [ ]:
dicionario.values()
In [ ]:
x = {'a':1, 'b': 2}
y = {'b':10, 'c': 11}
x.update(y)
print(x)
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list1 = ['a', 'b', 'c']
list2 = [1, 2, 3]
list3 = zip(list1, list2) # PACK
print(list3)
list4, list5 = zip(*list3) # UNPACK
print(list4)
print(list5)
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s = set([1, 2])
print(type(s))
print(s)
s.add(3)
s.add(3)
s.add(4)
print(s)
print(len(s))
print(2 in s)
print(3 in s)
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a = [2, 4, 6, 8, 10]
print(a)
del(a)
print(a)
In [ ]:
valor = 99
if valor == 99:
print 'veloz'
elif value > 200:
print 'muito veloz'
else:
print 'lento'
In [ ]:
x = 5
par_ou_impar = "par" if x % 2 == 0 else "impar"
print(par_ou_impar)
In [ ]:
a = [1, 3, 4, 5, 7]
for i in a:
print(i)
In [ ]:
a = [1, 3, 4, 5, 7]
for indice, valor in enumerate(a):
print(indice, valor)
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for _ in xrange(5):
print('oi')
In [ ]:
a = [2, 4, 6]
for i in xrange(len(a)):
print 'indice:{}, valor:{}'.format(i, a[i])
In [ ]:
a = [2, 4, 6]
for indice, valor in enumerate(a):
print 'indice:{}, valor:{}'.format(indice, valor)
In [ ]:
x = 0
while x < 5:
print x
x += 1
In [ ]:
for x in xrange(10):
if x == 3:
continue
if x == 5:
break
print x
In [ ]:
import itertools
a = [1, 2, 3]
b = [4, 5]
c = [6, 7, 8]
for a_, b_, c_ in itertools.product(a, b, c):
print('a:{}, b:{}, c:{}'.format(a_, b_, c_))
In [ ]:
def soma(a, b):
return a + b
print(soma(3, 5))
print(soma('casa ', 'organizada'))
In [ ]:
file = open('iris-dataset.txt')
print(file.name)
print(file.mode)
print(file.closed)
file.close()
print(file.closed)