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How to write to an existing excel file without overwriting data (using pandas)?
...iteration you append the dataframe to a list. In the end you only need to concat. If they follow the same structure will work as a charm. list_my_dfs = [df1, df2, ...] # List of your dataframes my_dfs_together = pd.concat(list_my_df ) # concat my dataframes in a single df
– ...
convert a list of objects from one type to another using lambda expression
...
Try the following
var targetList = origList
.Select(x => new TargetType() { SomeValue = x.SomeValue })
.ToList();
This is using a combination of Lambdas and LINQ to achieve the solution. The Select function is a projection style method which will apply the passe...
Generating a random password in php
...keyspace A string of all possible characters
* to select from
* @return string
*/
function random_str(
$length,
$keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
) {
$str = '';
$max = mb_strlen($keyspace, '8bit') - 1;
if ($max...
Add one row to pandas DataFrame
... It is worth noting however, that concat (and therefore append) makes a full copy of the data, and that constantly reusing this function can create a significant performance hit. If you need to use the operation over several datasets, use a list comprehension...
How to find and return a duplicate value in array
...
@Kalanamith you can get duplicated values using this a.select {|e| a.count(e) > 1}.uniq
– Naveed
Jul 12 '13 at 16:34
...
Regex select all text between tags
What is the best way to select all the text between 2 tags - ex: the text between all the 'pre' tags on the page.
17 Answe...
pandas dataframe columns scaling with sklearn
...
@RajeshThevar The outer brackets are pandas' typical selector brackets, telling pandas to select a column from the dataframe. The inner brackets indicate a list. You're passing a list to the pandas selector. If you just use single brackets - with one column name followed by ...
Convert line-endings for whole directory tree (Git)
...license - print the SFK license text
help by subject
sfk help select - how dirs and files are selected in sfk
sfk help options - general options reference
sfk help patterns - wildcards and text patterns within sfk
sfk help chain - how to combine (chain) multiple ...
Is there a JavaScript MVC (micro-)framework? [closed]
...n excellent solution. It's everything is a plugin approach enables you to select only the features you need. As of 2.0, it's based on jQuery.
On progressively enhancing your website, that's left up to the user as JMVC provides just a middle layer for development - it's up to you to make that de...
Oracle nvarchar和varchar相互转换、联合查询 - 数据库(内核) - 清泛网 - ...
...tatype isNVARCHAR2.
（A表字段c_xxx:varchar，B表c_xxx:nvarchar）
select translate(c_xxx USING NCHAR_CS) from A
union all
select c_xxx from B
或者
select c_xxx from A
union all
select translate(c_xxx USING CHAR_CS) from B
注意：translate函数括号中没有逗号。
1、...