我正在与Regex合作,而且我是使用python的新手。我无法让程序从文件中读取并正确完成匹配案例。我收到的回溯错误如下:
Traceback (most recent call last):
File "C:\Users\Systematic\workspace\Project8\src\zipcode.py", line 18, in <module>
m = re.match(info, pattern)
File "C:\Python34\lib\re.py", line 160, in match
return _compile(pattern, flags).match(string)
File "C:\Python34\lib\re.py", line 282, in _compile
p, loc = _cache[type(pattern), pattern, flags]
TypeError: unhashable type: 'list'
zipin.txt:
3285
32816
32816-2362
32765-a234
32765-23
99999-9999
zipcode.py:
from pip._vendor.distlib.compat import raw_input
import re
userinput = raw_input('Please enter the name of the file containing the input zipcodes: ')
myfile = open(userinput)
info = myfile.readlines()
pattern = '^[0-9]{5}(?:-[0-9]{4})?$'
m = re.match(info, pattern)
if m is not None:
print("Match found - valid U.S. zipcode: " , info, "\n")
else: print("Error - no match - invalid U.S. zipcode: ", info, "\n")
myfile.close()
答案 0 :(得分:1)
问题是readlines()返回一个列表,然后对类似字符串的东西进行操作。这是一种可行的方式:
import re
zip_re = re.compile('^[0-9]{5}(?:-[0-9]{4})?$')
for l in open('zipin.txt', 'r'):
m = zip_re.match(l.strip())
if m:
print l
break
if m is None:
print("Error - no match")
代码现在在文件行上循环操作,并尝试匹配每行的剥离版本上的re。
修改强>
实际上可以用更简短的方式写出来,但不太清楚:
next((l for l in open('zipin.txt', 'r') if zip_re.match(l.strip())), None)