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MySQL: Sort GROUP_CONCAT values
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edited Jun 15 '09 at 14:09
answered Jun 15 '09 at 10:23
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One-liner to recursively list directories in Ruby?
...Dir.glob("**/*") # for all files
Instead of Dir.glob(foo) you can also write Dir[foo] (however Dir.glob can also take a block, in which case it will yield each path instead of creating an array).
Ruby Glob Docs
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SQLite in Android How to update a specific row
I've been trying to update a specific row for a while now, and it seems that there are two ways to do this. From what I've read and tried, you can just use the:
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SQL Server Regular expressions in T-SQL
Is there any regular expression library written in T-SQL (no CLR, no extended SP , pure T-SQL) for SQL Server, and that should work with shared hosting?
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How do I write output in same place on the console?
I am new to python and am writing some scripts to automate downloading files from FTP servers, etc. I want to show the progress of the download, but I want it to stay in the same position, such as:
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python pandas remove duplicate columns
...nd you wish to remove them:
df = df.loc[:,~df.columns.duplicated()]
How it works:
Suppose the columns of the data frame are ['alpha','beta','alpha']
df.columns.duplicated() returns a boolean array: a True or False for each column. If it is False then the column name is unique up to that point, ...
Why do I get AttributeError: 'NoneType' object has no attribute 'something'?
...stead of an instance of whatever Class or Object you think you're working with, you've actually got None. That usually means that an assignment or function call up above failed or returned an unexpected result.
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Changing a specific column name in pandas DataFrame
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Following is the docstring for the rename method.
Definition: df.rename(self, index=None, columns=None, copy=True, inplace=False)
Docstring:
Alter index and / or columns using input function or
functions. Function / dict values must be unique (1-to-1). Labels not
contained in a d...
How to select rows from a DataFrame based on column values?
...'column_name'] == some_value]
To select rows whose column value is in an iterable, some_values, use isin:
df.loc[df['column_name'].isin(some_values)]
Combine multiple conditions with &:
df.loc[(df['column_name'] >= A) & (df['column_name'] <= B)]
Note the parentheses. Due to Py...
What can you do in MSIL that you cannot do in C# or VB.NET? [closed]
All code written in .NET languages compiles to MSIL, but are there specific tasks / operations that you can do only using MSIL directly?
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