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list_generator.py
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list_generator.py
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# alternaitves: filter + lambda
airplanes = [
['Boeing', 400],
['Airbus', 300],
['Aeroprakt', 20],
['RosAvia', 10],
]
print((x for x in airplanes if x[1] < 100))
print()
# <generator object <genexpr> at 0x0078F918>
print([x for x in airplanes if x[1] < 100])
print()
# [['Aeroprakt', 20], ['RosAvia', 10]]
##############################################
class Cars:
name = ''
engine = 0.0
def __init__(self, name, engine):
self.name = name
self.engine = engine
def __str__(self):
return self.name
def __repl__(self):
return self.name + self.name
cars = (Cars('Lancer', 1.584), Cars('Impreza', 2.294), Cars('Fabia', 1.3))
for car in cars:
print(car)
print()
# Lancer
# Impreza
# Fabia
only_powerful = (car for car in cars if car.engine > 1.4)
for powerful in only_powerful:
print(powerful)
print()
# Lancer
# Impreza
found = [car for car in cars if car.name == 'Lancer']
lancer = found[0] if len(found) > 0 else None
print(lancer)
print()
# Lancer
found = [car for car in cars if car.name == 'Corolla']
corolla = found[0] if len(found) > 0 else None
print(corolla)
print()
# None
##################################
digits = [1, 2, 3, 4, 5]
squares = [a * a for a in digits]
print(squares)
print()
# [1, 4, 9, 16, 25]
##################################
a_list = [1, 9, 8, 4]
a_list = [elem * 2 for elem in a_list]
print(a_list)
print()
# [2, 18, 16, 8]
##################################
print([i for i in range(0, 100) if i % 5 == 0])
print()
# [0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95]
####################################
airplanes = [
['Boeing', 400],
['Airbus', 300],
['Aeroprakt', 20],
['RosAvia', 10],
]
airplanes_dict = {airplane[0]: airplane[1] for airplane in airplanes}
for vendor in airplanes_dict:
print(vendor)
print(airplanes_dict[vendor])
# Boeing
# 400
# RosAvia
# 10
# Aeroprakt
# 20
# Airbus
# 300
##################################
a_dict = {'a': 1, 'b': 2, 'c': 3}
print({value: {key, key + key} for key, value in a_dict.items()})
print()
# {1: 'a', 2: 'b', 3: 'c'}
#######
a = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print([v[-2:] for v in a[-2:]])
print()
# [[5, 6], [8, 9]]
vec1 = [2, 4, 6]
vec2 = [4, 3, -9]
print([x * y for x in vec1 for y in vec2])
print()
buff = []
for x in vec1:
for y in vec2:
buff.append(x*y)
print(buff)
print()