python - python打印正则表达式匹配产生空列表

我正在使用正则表达式来匹配以“ Dr.”开头的名称。但是，当我打印火柴时，它们将打印为列表，有些是空的。我想只打印名称。
码：

import re

f = open('qwert.txt', 'r')

lines = f.readlines()
for x in lines:
       p=re.findall(r'(?:Dr[.](\w+))',x)
       q=re.findall(r'(?:As (\w+))',x)
       print p
       print q

qwert.txt：

Dr.John and Dr.Keel
Dr.Tensa
Dr.Jees
As John winning Nobel prize
As Mary wins all prize
car
 tick me 3
 python.hi=is good
 dynamic
 and precise

tickme 2 and its in it
 its rapid
 its best
 well and easy

所需的输出：

John
Keel
Tensa
Jees
John
Mary

实际输出：

['John', 'Keel']
[]
['Tensa']
[]
['Jees']
[]
[]
['John']
[]
['Mary']
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]

最佳答案

您看到的[]是因为findAll返回字符串的list。如果您本身需要字符串，请遍历findAll的结果。

p=re.findall(r'(?:Dr[.](\w+))',x)
q=re.findall(r'(?:As (\w+))',x)
for str in p+q:
  print str

关于python - python打印正则表达式匹配产生空列表，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/24843768/