Question

4.2. String

4.2.1. String function

4.2.1.1. str.find()

找到字符，返回字符串位置。没有找到返回 -1

"aaa bbb ccc".find('aaa')
	

4.2.1.2. str.find()

查找并替换字符串

a = 'hello word'
a.replace('word','python')
	

4.2.2. Convert str to bytes in python

>>> b = str.encode(y)
>>> type(b) >>> b b’Hello World!’
To alter from bytes to str, capitalize on bytes.decode().
>>> z = b”Hello World!”
>>> y = “Hello World!”
>>> type(z)

>>> type(y)

To alter from str to bytes, capitalize on str.encode().
>>> a = bytes.decode(z)
>>> type(a)

>>> a
‘Hello World!’


# to utf-8		
'BG7NYT'.encode('utf-8')
# to utf-16
'BG7NYT'.encode('utf-16')

4.2.3. String format 字符串格式化输出

strHello = "the length of (%s) is %d" %('Hello World',len('Hello World'))
print strHello			

前导字符串加0

for i in range(5):
    print("%03d" % i)	

for i in range(100):
    print('{0:0>3d}'.format(i))    		

4.2.3.1. 格式化字典输出

	
member = {'name':'neo','age':18}
'my name is {name},age is {age}'.format(**member)        #**dict				
	
	

输出

	
>>> member = {'name':'neo','age':18}
>>> 'my name is {name},age is {age}'.format(**member) 
'my name is neo,age is 18'				
	
	

4.2.4. 正则处理字符串

 
import re

string = "TMP AAAAAA\r\nMSG BBBB"

print(re.sub(r'(TMP|MSG)\s', "", string))