python对list数据分段统计 python list 拆分

0x01：

部分参考：

 

• match(string[, pos[, endpos]]) | re.match(pattern, string[, flags]):       这个方法将从string的pos下标处起尝试匹配pattern；如果pattern结束时仍可匹配，则返回一个Match对象；如果匹配过程中pattern无法匹配，或者匹配未结束就已到达endpos，则返回None。     pos和endpos的默认值分别为0和len(string)；re.match()无法指定这两个参数，参数flags用于编译pattern时指定匹配模式。     注意：这个方法并不是完全匹配。当pattern结束时若string还有剩余字符，仍然视为成功。想要完全匹配，可以在表达式末尾加上边界匹配符'$'。     示例参见2.1小节。
• search(string[, pos[, endpos]]) | re.search(pattern, string[, flags]):       这个方法用于查找字符串中可以匹配成功的子串。从string的pos下标处起尝试匹配pattern，如果pattern结束时仍可匹配，则返回一个Match对象；若无法匹配，则将pos加1后重新尝试匹配；直到pos=endpos时仍无法匹配则返回None。     pos和endpos的默认值分别为0和len(string))；re.search()无法指定这两个参数，参数flags用于编译pattern时指定匹配模式。    

# encoding: UTF-8 import re # 将正则表达式编译成Pattern对象 pattern = re. compile (r 'world' ) # 使用search()查找匹配的子串，不存在能匹配的子串时将返回None # 这个例子中使用match()无法成功匹配 match = pattern.search( 'hello world!' ) if match: # 使用Match获得分组信息 print match.group() ### 输出 ### # world

• 
  
• split(string[, maxsplit]) | re.split(pattern, string[, maxsplit]):       按照能够匹配的子串将string分割后返回列表。maxsplit用于指定最大分割次数，不指定将全部分割。    

import re p = re. compile (r '\d+' ) print p.split( 'one1two2three3four4' ) ### output ### # ['one', 'two', 'three', 'four', '']

• 
  
• findall(string[, pos[, endpos]]) | re.findall(pattern, string[, flags]):       搜索string，以列表形式返回全部能匹配的子串。    

import re p = re. compile (r '\d+' ) print p.findall( 'one1two2three3four4' ) ### output ### # ['1', '2', '3', '4']

• 
  
• finditer(string[, pos[, endpos]]) | re.finditer(pattern, string[, flags]):       搜索string，返回一个顺序访问每一个匹配结果（Match对象）的迭代器。    

import re p = re. compile (r '\d+' ) for m in p.finditer( 'one1two2three3four4' ): print m.group(), ### output ### # 1 2 3 4

• 
  
• sub(repl, string[, count]) | re.sub(pattern, repl, string[, count]):       使用repl替换string中每一个匹配的子串后返回替换后的字符串。     当repl是一个字符串时，可以使用\id或\g<id>、\g<name>引用分组，但不能使用编号0。     当repl是一个方法时，这个方法应当只接受一个参数（Match对象），并返回一个字符串用于替换（返回的字符串中不能再引用分组）。     count用于指定最多替换次数，不指定时全部替换。    

import re p = re. compile (r '(\w+) (\w+)' ) s = 'i say, hello world!' print p.sub(r '\2 \1' , s) def func(m): return m.group( 1 ).title() + ' ' + m.group( 2 ).title() print p.sub(func, s) ### output ### # say i, world hello! # I Say, Hello World!

• 
  
• subn(repl, string[, count]) |re.sub(pattern, repl, string[, count]):       返回 (sub(repl, string[, count]), 替换次数)。    

import re p = re. compile (r '(\w+) (\w+)' ) s = 'i say, hello world!' print p.subn(r '\2 \1' , s) def func(m): return m.group( 1 ).title() + ' ' + m.group( 2 ).title() print p.subn(func, s) ### output ### # ('say i, world hello!', 2) # ('I Say, Hello World!', 2)

• 
  

0x02：自己的案例

需要对前端传来的

str数据切分成list

然后传给数据库

原数据：

{"value":"123","isEditing":false,"isActive":false,"isChecked":false},{"value":"2","isEditing":false,"isActive":false,"isChecked":false},{"value":"32","isEditing":false,"isActive":false,"isChecked":false},{"value":"12","isEditing":false,"isActive":false,"isChecked":false},{"value":"12","isEditing":false,"isActive":false,"isChecked":false},{"value":"123","isEditing":false,"isActive":false,"isChecked":false},{"value":"32","isEditing":false,"isActive":false,"isChecked":false},{"value":"23","isEditing":false,"isActive":false,"isChecked":false},{"value":"12","isEditing":false,"isActive":false,"isChecked":false},{"value":"321","isEditing":false,"isActive":false,"isChecked":false},{"value":"21","isEditing":false,"isActive":false,"isChecked":false}]

过滤：

str = text
def checkFilter(keywords,text):
    return re.sub('|'.join(keywords),'',str)
keywords = ('\'','"','\[{','\}]','\{')
a = checkFilter(keywords,text)
print (checkFilter(keywords,text))

输出结果：

<class 'str'>
******************
value:123,isEditing:false,isActive:false,isChecked:false},value:2,isEditing:false,isActive:false,isChecked:false},value:32,isEditing:false,isActive:false,isChecked:false},value:12,isEditing:false,isActive:false,isChecked:false},value:12,isEditing:false,isActive:false,isChecked:false},value:123,isEditing:false,isActive:false,isChecked:false},value:32,isEditing:false,isActive:false,isChecked:false},value:23,isEditing:false,isActive:false,isChecked:false},value:12,isEditing:false,isActive:false,isChecked:false},value:321,isEditing:false,isActive:false,isChecked:false},value:21,isEditing:false,isActive:false,isChecked:false

 

拆分：

b = a.split('},')
print(b)

输出结果：

******************
['value:123,isEditing:false,isActive:false,isChecked:false', 'value:2,isEditing:false,isActive:false,isChecked:false', 'value:32,isEditing:false,isActive:false,isChecked:false', 'value:12,isEditing:false,isActive:false,isChecked:false', 'value:12,isEditing:false,isActive:false,isChecked:false', 'value:123,isEditing:false,isActive:false,isChecked:false', 'value:32,isEditing:false,isActive:false,isChecked:false', 'value:23,isEditing:false,isActive:false,isChecked:false', 'value:12,isEditing:false,isActive:false,isChecked:false', 'value:321,isEditing:false,isActive:false,isChecked:false', 'value:21,isEditing:false,isActive:false,isChecked:false']
******************

源码：

import re
input = open('I:\\python_test\\json_mysql\\jsondata.txt','r')
text=input.read()
print (text)
print ('******************')
print (type(text))
print ('******************')
str = text
def checkFilter(keywords,text):
    return re.sub('|'.join(keywords),'',str)
keywords = ('\'','"','\[{','\}]','\{')
a = checkFilter(keywords,text)
print (checkFilter(keywords,text))
print ('******************')


b = a.split('},')
print(b)
print ('******************')
print (type(b))
print ('******************')
print (b[0])
print ('******************')
str1 = b[0]
b1 = str1.split(':')

print (b1[0])

输出：

[{"value":"123","isEditing":false,"isActive":false,"isChecked":false},{"value":"2","isEditing":false,"isActive":false,"isChecked":false},{"value":"32","isEditing":false,"isActive":false,"isChecked":false},{"value":"12","isEditing":false,"isActive":false,"isChecked":false},{"value":"12","isEditing":false,"isActive":false,"isChecked":false},{"value":"123","isEditing":false,"isActive":false,"isChecked":false},{"value":"32","isEditing":false,"isActive":false,"isChecked":false},{"value":"23","isEditing":false,"isActive":false,"isChecked":false},{"value":"12","isEditing":false,"isActive":false,"isChecked":false},{"value":"321","isEditing":false,"isActive":false,"isChecked":false},{"value":"21","isEditing":false,"isActive":false,"isChecked":false}]
******************
<class 'str'>
******************
value:123,isEditing:false,isActive:false,isChecked:false},value:2,isEditing:false,isActive:false,isChecked:false},value:32,isEditing:false,isActive:false,isChecked:false},value:12,isEditing:false,isActive:false,isChecked:false},value:12,isEditing:false,isActive:false,isChecked:false},value:123,isEditing:false,isActive:false,isChecked:false},value:32,isEditing:false,isActive:false,isChecked:false},value:23,isEditing:false,isActive:false,isChecked:false},value:12,isEditing:false,isActive:false,isChecked:false},value:321,isEditing:false,isActive:false,isChecked:false},value:21,isEditing:false,isActive:false,isChecked:false
******************
['value:123,isEditing:false,isActive:false,isChecked:false', 'value:2,isEditing:false,isActive:false,isChecked:false', 'value:32,isEditing:false,isActive:false,isChecked:false', 'value:12,isEditing:false,isActive:false,isChecked:false', 'value:12,isEditing:false,isActive:false,isChecked:false', 'value:123,isEditing:false,isActive:false,isChecked:false', 'value:32,isEditing:false,isActive:false,isChecked:false', 'value:23,isEditing:false,isActive:false,isChecked:false', 'value:12,isEditing:false,isActive:false,isChecked:false', 'value:321,isEditing:false,isActive:false,isChecked:false', 'value:21,isEditing:false,isActive:false,isChecked:false']
******************
<class 'list'>
******************
value:123,isEditing:false,isActive:false,isChecked:false
******************
value

2910.1.14-------------------------------------------------------------------------------------------------------

拼接dict类型 json

----------------------------------------------------------------------------------------------------------------

b = a.split('},')
print(b)
print ('******************')
print (type(b))
print ('******************')
print (b[0])
print (type(b[0]))
print ('******************')
lines_json = b[0].replace(',', '","')#替换字符;;;;;具体b[i] for输出到数据库
lines_json1 = lines_json.replace(':','":"')
lines_json2 = ('{"'+lines_json1+'"}')
print (lines_json2)
print ('******************')
j = json.loads(lines_json2)
print (j)
print (j["value"])
print(type(j))

 

输出：

******************
<class 'list'>
******************
value:123,isEditing:false,isActive:false,isChecked:false
<class 'str'>
******************
{"value":"123","isEditing":"false","isActive":"false","isChecked":"false"}
******************
{'isActive': 'false', 'value': '123', 'isEditing': 'false', 'isChecked': 'false'}
123
<class 'dict'>