A summary of very practical Python tips

This article mainly introduces Python common tips. Examples summarize Python's operating skills on dictionary, string, random numbers, etc. It is very simple and practical. Friends who need it can Refer to

The examples in this article summarize common tips in Python. Share it with everyone for your reference. The specific analysis is as follows:

1. Get the local mac address:

import uuid
mac = uuid.uuid1().hex[-12:]
print(mac)

Run result: e0cb4e077585

2. Use of del

a = ['b','c','d']
del a[0]
print(a)# 输出 ['c', 'd']

a = ['b','c','d']
del a[0:2] # 删除从第1个元素开始，到第2个元素
print(a)# 输出 ['d']

a = ['b','c','d']
del a
print(a) # 此时a未定义

3. Use of join

a = ['c','d']
a.reverse()
a = ['d','c']
b = ','.join(a)
print(b) # 输出 d,c

4. Random number usage:

import random
x = random.randint(1,100)
y = random.choice( 'abcd')
print(x)
print(y)

The running result is:

68
b

5. Use of dict:

a=[1,2,3]
b=['a','b','c']
c=dict(zip(a,b))
print(c) # 输出： {1:'a',2:'b',3:'c'}

6. Use of map:

##

a='1-2-3-4'
b=map(int,a.split('-'))
print(b) # 输出： [1,2,3,4]

7. Use of []:

[].remove( value )

[].pop( index ) = value
[].
count( x ) = number of x in the list {}Use
{}.pop( key ) = value
{}.get( key ) = value or {}.get( key ,0 ) to set the default value

8. String Operation

a = str.decode( 'utf-8' )
b = str.encode( 'utf-8' )
str.isdigit() # 是否数值
str1 = 'abc%s'%str2

9. String traversal:

##

import string
x= string.ascii_lowercase
# print(x) # 输出： abcdefghijklmnopqrstuvwxyz
d = enumerate( x )
c = list( d )
print(c)

Output:

[(0 , 'a'), (1, 'b'), (2, 'c'), (3, 'd'), (4, 'e'), (5, 'f'), (6, ' g'), (7, 'h'), (8, 'i'), (9, 'j'), (10, 'k'), (11, 'l'), (12, 'm' ), (13, 'n'), (14, 'o'), (15, 'p'), (16, 'q'), (17, 'r'), (18, 's'), (19, 't'), (20, 'u'), (21, 'v'), (22, 'w'), (23, 'x'), (24, 'y'), (25 , 'z')]

for i ,j in d:

At this time:

i = 0,1,2,...,25

j = 'a','b'......,'z'

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