Python入門上（第三天）

一、推導式

列表推導式

[ expr for value in collection [if condition] ]

( expr for value in collection [if condition] )

- `next(iterator[, default])` return the next item from the iterator. if default is given and the iterator is exhausted, it is returned instead of raising stopiteration.

x = [[i, j] for i in range(0, 3) for j in range(0, 3)]

print(x)
# [[0, 0], [0, 1], [0, 2], [1, 0], [1, 1], [1, 2], [2, 0], [2, 1], [2, 2]]
x[0][0] = 10
print(x)
# [[10, 0], [0, 1], [0, 2], [1, 0], [1, 1], [1, 2], [2, 0], [2, 1], [2, 2]]

b = 

print(b)
#

e = (i for i in range(10))

print(e)
# at 0x0000007a0b8d01b0>
print(next(e)) # 0
print(next(e)) # 1
for each in e:
print(each, end=' ')
# 2 3 4 5 6 7 8 9

e = (i for i in range(10))

print(e)
# at 0x0000007a0b8d01b0>
print(next(e)) # 0
print(next(e)) # 1
for each in e:
print(each, end=' ')
# 2 3 4 5 6 7 8 9

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