Common syntax skills in Python

I recently read from many colleaguesCode, Encountered some Python statements that have never been used before, accumulate it.

1. Obtain the local MAC address:

Import UUID

MAC = UUID. uuid1 (). HEX [-12:]

2 del usage

A = ['B', 'C', 'D']

Del a [0]

Then a = ['C', 'D']

Del a [0: 1]

Then a = ['D']

Del

Then a is undefined.

3 A = ['C', 'd]

A. Reverse ()

A = ['D', 'C']

B = ','. Join ()

B = 'd, C'

4 import random

X = random. randint (1,100)

Y = random. Choice ('abcd ')

5 A = [1, 2, 3]

B = ['A', 'B', 'C']

C = dict (ZIP (a, B ))

Then c = {1: 'A', 2: 'B', 3: 'C '}

6 A = '1-2-4-4'

B = map (INT, A. Split ('-'))

Then B = [1, 2, 4]

7 [] Use

[]. Remove (value)

[]. Pop (INDEX) = Value

[]. Count (x) = x number in the list

{} Use

{}. Pop (key) = Value

{}. Get (key) = value or {}. Get (Key, 0) set the default value

8 A = Str. Decode ('utf-8 ')

B = Str. encode ('utf-8 ')

Str. isdigit () whether it is a numerical value

Str1 = 'abc % s' % str2

9 Import string

X = string. ascii_lowercase

Then X = 'abcdefghijklmnopqrstuvwxy'

D = enumerate (X)

C = List (d)

Then c = [(0, 'A'), (1, 'B') ......]

For I, J in D:

Then I = 0, 1, 2 ,.....

J = 'A', 'B '......

10 A = test () [0]
When the length of the result returned by test () is 1, the preceding statement is equivalent
A, = test ()