express | 快速简单查询快递信息 | Application Framework library
kandi X-RAY | express Summary
kandi X-RAY | express Summary
快速简单查询快递信息
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QUESTION
I have this code which prints multiple tables
...ANSWER
Answered 2021-Jun-15 at 20:59So, this is a good opportunity to use purrr::map
. You are half way there by applying code to one dataframe.
You can take the code that you have written above and put it into a function.
QUESTION
I have a simple code where I try to define a vector as one of two initializer lists using a ternary operator:
...ANSWER
Answered 2021-Jun-15 at 21:48Because you can't have braces in that context. If you look at cppreference on list initialization, you see that the case inside a ternary operator isn't defined. So it can't be parsed correctly and you get the error you have.
You'd have to use something like this :
QUESTION
I am practicing regular expressions in Kotlin and trying to start with a multiline string. However, I am not receiving any matches. I feel like I am doing it right and can't figure out the problem.
Test lines:
...ANSWER
Answered 2021-Jun-15 at 21:32Here is how it works:
QUESTION
GNU grep's basic (BRE) and extended (ERE) syntax is documented at https://www.gnu.org/software/grep/manual/html_node/Regular-Expressions.html and PCRE is summarized at man pcresyntax
, but there is no explicit comparison. What are the differences between GNU grep's basic/extended and PCRE (-P
) regular expressions?
ANSWER
Answered 2021-Jun-15 at 20:55My research of the major syntax and functionality differences from http://www.greenend.org.uk/rjk/tech/regexp.html:
.
in GNU grep does not match null bytes and newlines (but does match newlines when used with--null-data
), while Perl, everything except\n
is matched.[...]
in GNU grep defines POSIX bracket expressions, while Perl uses "character" classes. I'm not sure on the details. See http://www.greenend.org.uk/rjk/tech/regexp.html#bracketexpression- "In basic regular expressions the meta-characters
?
,+
,{
,|
,(
, and)
lose their special meaning; instead use the backslashed versions\?
,\+
,\{
,\|
,\(
, and\)
." From https://www.gnu.org/software/grep/manual/html_node/Basic-vs-Extended.html. ERE matches PCRE syntax. - GNU grep
\w
and\W
are the same as[[:alnum:]]
and[^[:alnum]]
, while Perl uses alphanumeric and underscore. - GNU grep has
\<
and\>
for start and end of word.
Perl supports much more additional functionality:
- "nongreedy {}" with syntax
re{...}?
- additional anchors and character types
\A
,\C
,\d
,\D
,\G
,\p
,\P
,\s
,\S
,\X
.\Z
,\z
. (?#comment)
- shy grouping
(?:re)
, shy grouping + modifiers(?modifiers:re)
- lookahead and negative lookahead
(?=re)
and(?!re)
, lookbehind and negative lookbehind(?<=p)
and(?
- Atomic groups
(?>re)
- Conditional expression
(?(cond)re)
- ... and more, see
man pcresyntax
QUESTION
So I want to be able to look at a specific week of the year and look at all data in the preceding and following 6 weeks.
WHERE t1.weeknum >= week-6 AND t1.weeknum <=week+6
So if week is 20, I want to return everything between 14 and 26.
The problem is weeks >=47 and <=6. For instance, if week is 4, I want the range to be 50 through 10. Years are a separate dimension and I am including all data regardless of year.
I think this would be similar to a compass heading. Say you are at 350 degrees and turn right 30 degrees. 350+30 = 20 degree bearing.
I'm using SQL Server Express
...ANSWER
Answered 2021-Jun-15 at 20:11The Modulus operator (%) seems to be what you want. Since you are using the range 1
to 52
to represent week numbers you need to shift the range to 0
to 51
while calculating:
QUESTION
I am generating lexical analyzer with JLEX. I found a regular expression for string literal from this link and used it in .jflex file same of other expressions. but it gives me this error :
unterminated string at the end of the line
StringLiteral = \"(\\.|[^"\\])*\"
can anyone help me please, thanks.
...ANSWER
Answered 2021-Jun-15 at 20:46The regular expression you copied is for (f)lex, which uses a slightly different syntax for regular expressions. In particular, (f)lex treats "
as an ordinary character inside bracketed classes, so [^"\\]
is a character class matching anything other than (^
) a quotation mark ("
) or a backslash (\\
).
However, in JFlex, the "
is a quoting character, whether outside or inside brackets. So the "
in the character class is unterminated. Hence the error message.
So you need to backslash-escape it:
QUESTION
I have to parse lists of names, addresses, etc. that were OCRed and have invalid/incorrect characters in them and on the state postal code I need to recognize the pattern with a 2 character state followed by a 5 digit postal code and replace any non numeric characters in the postal code. I might have OK 7-41.03
at the end of a string I need to remove the hyphen and period. I know that re.sub('[^0-9]+', '', '7-41.03')
will remove the desired characters but I need it only replace characters in numbers when found at the end of the string and only if preceded by a two character state wrapped in spaces like OK
. It seems if I add anything to the regular expression as far as a lookbehind expression then I can't seem to get the characters replaced. I've come up with the following but I think there must be a simpler expression to accomplish this. Example:
ANSWER
Answered 2021-Jun-15 at 20:02You need to make use of re.sub
callbacks:
QUESTION
I am using a method to remove univariate outliers. This method only works if the vector contains outliers.
How is it possible to generalize this method to work also with vectors without outliers. I tried with ifelse
without success.
ANSWER
Answered 2021-Jun-15 at 19:58Negate (!
) instead of using -
which would work even when there are no outliers
QUESTION
Consider the following code:
...ANSWER
Answered 2021-Jun-15 at 18:22i think you are looking for this:
QUESTION
I get it again and again
...ANSWER
Answered 2021-Jun-15 at 18:09You have to make the property overridable, so make it virtual
:
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