week4 17.11.2019 Note

#week417.11.2019


square = []
for x in range(10):
    square.append(x**2)

square

squares = list(map(lambda x : x**2, range(10)))

squares = [x**2 for x in range(10)]


[(x,y) for x in [1,2,3] for y in [3,1,4] if x != y]
[(x,y) for x in [2,5,6,3] for y in [4,3,6,5] if x != y]

[(x,y) for x in [2,5,6,3] for y in [4,3,6,5] if x == y]

combs = []
for x in [1, 2, 3]:
    for y in [3, 1, 4]:
            if x !=y:
                    combs.append((x,y))

combs

vec = [-4, -2, 0, 2, 4]
[x*2 for x in vec]

[x for x in vec if x >= 0]

freshfruit = [' banana', ' loganberry ', ' passion fruit ']
[weapon.strip() for weapon in freshfruit]

[(x, x**2) for x in range(6)]

[x, x**2 for x in range(6)]

num = [[1, 2, 3, 4, 5], [5, 6, 7, 8, 1, 9], [4, 9, 3, 6, 8, 3]]

num[0][3]
num[2][2]
num[1][4]
num[2][4]
num[0][0]
num[]

from math import pi
[str(round(pi, i)) for i in range(1, 6)]
['3.1', '3.14', '3.142', '3.1416', '3.14159']

matrix = [
	[1, 2, 3, 4],
	[5, 6, 7, 8],
	[9, 10, 11, 12],
	]
matrix

[[row[i] for row in matrix] for i in range(4)]

for i in range(4):
for row in matrix

for x in range(10):
	for y in range(10):

transposed = []
for i in range(4):
    transposed.append([row[i] for row in matrix])

transposed
transposed[3][2]

transposed = []
for i in range(4):
    transposed_row = []
    for row in matrix:
            transposed_row.append(row[i])
    transposed.append(transposed_row)

transposed