To quote the Python 2.x documentation: A prefix of ‘b’ or ‘B’ is ignored in Python 2; it indicates that the literal should become a bytes literal in Python 3 (e.g. when code is automatically converted with 2to3). A ‘u’ or ‘b’ prefix may be followed by an ‘r’ prefix. The Python 3 documentation states: Bytes literals are … Read more
The problem here is that the + operator has (at least) two different meanings in Python: for numeric types, it means “add the numbers together”: … and for sequence types, it means “concatenate the sequences”: As a rule, Python doesn’t implicitly convert objects from one type to another1 in order to make operations “make sense”, because that would … Read more
like this: Actually, even though I typically do it like this for simple convenience, over 1,000s of iterations it appears for raw speed there is an advantage for .toString() See Performance tests here (not by me, but found when I went to write my own): http://jsben.ch/#/ghQYR Fastest based on the JSPerf test above: str = num.toString(); It should be … Read more
You can use str.isalnum: If you insist on using regex, other solutions will do fine. However note that if it can be done without using a regular expression, that’s the best way to go about it.
This can be done without regex: You can use str.isalnum: If you insist on using regex, other solutions will do fine. However note that if it can be done without using a regular expression, that’s the best way to go about it.
As comments and other answers indicate your question may not be quite explicit enough. Taking it at face value, if you just want to replace double quotes (“) you should use str_replace()
For empty strings both are different: will not print anything because it is empty and therefore considered False but: will print because foo is not None! I Changed it according to PEP8. if foo is not None is equivalent to your if not foo is None but more readable and therefore recommended by PEP8. A bit more about the general principles in Python: The if will only be True if a … Read more
No. Python Strings are immutable. It is, however, possible to create a new string that has the inserted character:
EDIT: As pointed out in the comment, itoa() is not a standard, so better use sprintf() approach suggested in the rivaling answer! You can use itoa() function to convert your integer value to a string. Here is an example: If you want to output your structure into a file there is no need to convert any value beforehand. You can just use … Read more
Here is my code: Please give me some suggestion about this.