修剪或删除定界文本中的单个空格字符

Question

I have an issue where I am getting a # delimited file, however, in between the hashes, there is a single white space character signifying an empty value. This is causing me problems when I try to query the file later on. Is there a way I can remove all instances in a delimited line where just a single white space char exists?

Here's a sample line from my file.

40001#World Music#Mike Oldfield#Tubular Bells#   53# # #

I would want the string to be...

40001#World Music#Mike Oldfield#Tubular Bells#   53###

Answer 1

Using ternary conditionals and list comprehensions, you can do:

s = "40001#World Music#Mike Oldfield#Tubular Bells#   53# # #"
s2 = "#".join([i if i != " " else "" for i in s.split("#")])
print s2

prints

40001#World Music#Mike Oldfield#Tubular Bells#   53###

No need for imports (eg RE)

Answer 2

Use regular expressions .

import re

my_str = "40001#World Music#Mike Oldfield#Tubular Bells# 53# # #"
pattern = re.compile(r'(#)\s(#)\s(#)')

new_str = re.sub(pattern, r'\1\2\3', my_str)

print(new_str)

Answer 3

Use re.sub function.

re.sub(r'(?<=#) (?=#)', r'', string)

OR

re.sub(r'(?<=#)\s(?=#)', r'', string)

Example:

>>> s = "40001#World Music#Mike Oldfield#Tubular Bells#   53# # #"
>>> re.sub(r'(?<=#) (?=#)', r'', s)
'40001#World Music#Mike Oldfield#Tubular Bells#   53###'

• (?<=#) Positive lookbehind asserts that the match must be preceded by a #
• \\s Matches a space character.
• (?=#) Positive lookahead which asserts that the match must be followed by a # character.

Answer 4

This regex seems to do what you want, using a positive lookahead: http://regexr.com/3abqs

import re
str = "40001#World Music#Mike Oldfield#Tubular Bells#   53# # #"
strf = re.sub(r'#\s+(?=#)', r'#', str)
print(strf)

Answer 5

You can use something like:-

orig_str="40001#World Music#Mike Oldfield#Tubular Bells#   53# # #"
splitted_str = orig_str.split("#")[:-1]
new_str = ''
for item in splitted_str:
  if item.strip():
    new_str+=item
  new_str+="#"
print new_str  

This would print 40001#World Music#Mike Oldfield#Tubular Bells# 53###