英文:
Python-replace tripple and 4 times double quotes with a double quote
问题
I have a String like this:
"""{\""College\""
Want to remove 3 and 2 times double quotes to only one time like this:
"{\"College\"
How can I do that, I tried the replace() function but it removes all the quotes. Can someone help please, I am new to Python?
Tried replace("\"\"","\""), but not working.
英文:
I have String like this:
"""{\""College\""
Want to remove 3 and 2 times double quotes to only one time like this:
"{\"College\"
How can I do that , I tried replace() function but it removes all the quotes.Can someone help please I am new to Python
Tried replace("\"\"","\"") but not working
答案1
得分: 1
1
以下代码重复替换 2 个 " 为 1 个 "。
它执行 log(n) 次循环，不像单个循环那样高效，但可读性较好，算法明显。
mystring = '"""{\""College\""''
while '""' in mystring:
mystring = mystring.replace('""', '"')
print(mystring)
(timeit 显示每次循环 430 纳秒)
2
另一种更复杂且更高效（适用于更大字符串）的一行代码：
print('"'.join((e for e in ('|'+mystring+'|').split('"') if e))[1:-1])
(timeit 显示每次循环 945 纳秒)
' | ' 用于填充字符串，以考虑边缘情况，即字符串两端有 "。
3
最后，基于正则表达式的解决方案（在Python中有时速度较慢）
import re
print(re.sub('"+', '"', mystring))
(timeit 显示每次循环 1.28 微秒)
英文:
1
the following code repeatedly replaces 2 " with 1 ".
It does do log(n) loops and is not as efficient as a single loop would be, but it is readable and the algorithm is obvious.
mystring = '"""{\""College\""'
while '""' in mystring:
mystring = mystring.replace('""', '"')
print(mystring)
(timeit shows 430 ns per loop)
2
alternate more complicated + more efficient(for larger strings) oneliner:
print('"'.join((e for e in ('|'+mystring+'|').split('"') if e))[1:-1])
(timeit shows 945 ns per loop)
the '|' is used to pad the string to account for the edge case where there are " on the ends.
3
and finally a regex based solution (sometimes pretty slow in python)
import re
print(re.sub('"+', '"', mystring))
(timeit shows 1.28 µs per loop)
答案2
得分: 0
你可以用一个简单的正则表达式来解决这个问题。例如，表达式 \"{2,3} 可以匹配任何双引号或三引号。
英文:
You could solve this with a simple regular expression (Docs).
For instance the expression: \"{2,3} would match any double or triple quotes.
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