Pyhton——List，Sorting，Tuples类型

以下是学习goole PYTHON教程过程中的一些笔记。

'#' 后面的是输出，希望你能从中获取你想要的。

Lists,Sorting,and Tuples

[1, 2, 3]

#[1, 2, 3]

a = [1, 2, 3]

a

#[1, 2, 3]

a = [1, 2, 'aaaa']

a

#[1, 2, 'aaaa']

len(a)

#3

[1, 2, 'aaaa'] + [3, 4]

#[1, 2, 'aaaa', 3, 4]

a = [1, 2, 3]

b = a

a

#[1, 2, 3]

b

#[1, 2, 3]

a[0]

#1

a[0] = 13

a

#[13, 2, 3]

b

#[13, 2, 3]

b = a[:]

b

#[13, 2, 3]

a == b

#True

a[1:3]

#[2, 3]

a[:-1]

#[13, 2]

for num in a:print num

#13

#2

#3

a.apend(4)

a

#[13, 2, 3 , 4]

None

#

a.pop(0)

#13

a

#[2, 3, 4]

del a

a

#error

a = [1, 2, 3]

a[1]

#2

del a[1]

[1, 3]

b = 12

a = b

del a

b

#12

a = [4, 2, 1, 6]

sorted(a)

#[1, 2, 4, 6]

help(sorted)

#it will show the detail how to user the sorted method

sorted(a, reverse=True)

#[6, 4, 2, 1]

a = ['ccc', 'bb', 'd', 'bb']

sorted(a)

#['aaaa', 'bb', 'ccc', 'd']

sorted(a, key=len)

#['d', 'bb', 'ccc', 'aaaa']

a

#['ccc', 'bb', 'd', 'bb']

a[1] = 'aaaz'

a

#['ccc', 'aaaz', 'd', 'bb']

def Last(s):return s[-1]

#<function Last at 0x011F0E30>

a

#['ccc', 'aaaz', 'd', 'bb']

sorted(a, key=Lost)

#['bb', 'ccc', 'd', 'aaaz']

':'.join(a)

#'cc:aaaz:d:bb'

'\n'.join(a)

#'ccc\naaaz\nd\nbb'

b =':'.join(a)

b

#'cc:aaaz:d:bb'

':'.split(b)

#[':']

b.split(':')

#['ccc', 'bb', 'd', 'bb']

a

#['ccc', 'bb', 'd', 'bb']

result = []

for s in a: result.append(s)

result

#['ccc', 'bb', 'd', 'bb']

range(20)

#[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]

(1, 2, 3)

#(1, 2, 3)

a = (1, 2, 3)

len(a)

#3

a[0]

#1

a[0] = 13
#Traceback (most recent call last):
# File "<pyshell#34>", line 1, in <module>
# a[0] = 13
#TypeError: 'tuple' object does not support item assignment

a = [(1, "b"), (2, "a"), (1, "a")]

a

#[(1, "b"), (2, "a"), (1, "a")]

sorted(a)

#[(1, 'a'), (1, 'b'), (2, 'a')]

(x, y) = (1, 2)

x

#1

y

#2