python 2.7 split和.col concatenate

为什么不用re来做同样的事情呢?

import re
str = "'`col` array<struct< columnname:string,columnname1:int,columnname2:decimal(10,0),columnname3:decimal(9,2)>>'"
word = re.findall("`\w+`",str,) # match for columns 
word = " ".join(word)
word = re.sub(r'\W+', '', word) # strip `` 
columnnames = re.findall(r"(\w+):",str) # find all words before `:`
for c in columnnames:
  c = re.sub(r'\W+', '', c) # to remove `:`
  print  "%s.%s," %( word,c)

输出:

col.columnname,
col.columnname1,
col.columnname2,
col.columnname3,

从您可以使用的文件中读取 open(filename,mode) 方法

import re
with open("test.txt","r") as h:
 str = h.read()
 word = re.findall(r"`\w+`",str,)
 word = " ".join(word)
 word = re.sub(r'\W+', '', word)
 columnnames = re.findall(r"(\w+):",str)
 for c in columnnames:
    c = re.sub(r'\W+', '', c)
    print  "%s.%s," %( word,c)

要写入文件:

import re
with open("test.txt","r") as h:
with open("output.dat","a") as w:
str = h.read()
word = re.findall(r"`\w+`",str,)
word = " ".join(word)
word = re.sub(r'\W+', '', word)
columnnames = re.findall(r"(\w+):",str)
for c in columnnames:
    c = re.sub(r'\W+', '', c)
    data =  "%s.%s," %( word,c)
    w.write(data+"\n")
w.close()
h.close()