大约有 40,000 项符合查询结果（耗时：0.0320秒） [XML]
Split comma-separated strings in a column into separate rows
... occasions, because the datatable approaches only produce tables with the "selected" columns, while dplyr produces a result with all the columns (including the ones not involved in the analysis and without having to write their names in the function).
– Ferroao
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URLEncoder not able to translate space character
...be encoded as follows:
Control names and values are escaped. Space characters are replaced
by `+'
You will have to replace it, e.g.:
System.out.println(java.net.URLEncoder.encode("Hello World", "UTF-8").replace("+", "%20"));
...
Count characters in textarea
I want to count characters in a textarea, so I just made:
21 Answers
21
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Print all but the first three columns
...ents. We have asked the OP to choose a more correct answer, and he/she has selected mine. After some other contributors have edited my answer to reference there answer (see the history). Is it clear for you? What do you advice me to improve the understandability of my answer? Cheers ;-)
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Iterating each character in a string using Python
...of which start with 0. So I need to find a "0" and grab it and the next 3 characters, and move on without duplicating the number if there's another 0 following it. None of the "for c in str" or "for i,c in enumerate(str)" methods work because I need control of the index. I'm sure a regular express...
MySQL Conditional Insert
...
If your DBMS does not impose limitations on which table you select from when you execute an insert, try:
INSERT INTO x_table(instance, user, item)
SELECT 919191, 123, 456
FROM dual
WHERE NOT EXISTS (SELECT * FROM x_table
WHERE user = ...
Hash Map in Python
...] * self.size
def _get_hash(self, key):
hash = 0
for char in str(key):
hash += ord(char)
return hash % self.size
def add(self, key, value):
key_hash = self._get_hash(key)
key_value = [key, value]
if self.map[key_hash] is None:
...
Deserialize JSON into C# dynamic object?
...st<object>(arrayList.Cast<IDictionary<string, object>>().Select(x => new DynamicJsonObject(x)))
: new List<object>(arrayList.Cast<object>());
}
return result;
}
}
#endregion
}
You can use it like this:
...
Python json.loads shows ValueError: Extra data
..., end, len(s)))
ValueError: Extra data: line 1 column 3 - line 1 column 5 (char 2 - 4)
If you want to dump multiple dictionaries, wrap them in a list, dump the list (instead of dumping dictionaries multiple times)
>>> dict1 = {}
>>> dict2 = {}
>>> json.dumps([dict1, dic...
How do you iterate through every file/directory recursively in standard C++?
...Find = INVALID_HANDLE_VALUE;
}
return true;
}
int main(int argc, char* argv[])
{
vector<wstring> files;
if (ListFiles(L"F:\\cvsrepos", L"*", files)) {
for (vector<wstring>::iterator it = files.begin();
it != files.end();
++it) {
...