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Adding 'serial' to existing column in Postgres
...imary key) which currently contains unique sequential integers starting at 1, but which was not created using the 'serial' keyword.
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How to read the content of a file to a string in C?
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Renaming columns in pandas
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Just assign it to the .columns attribute:
>>> df = pd.DataFrame({'$a':[1,2], '$b': [...
How to sort a dataFrame in python pandas by two or more columns?
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As of the 0.17.0 release, the sort method was deprecated in favor of sort_values. sort was completely removed in the 0.20.0 release. The arguments (and results) remain the same:
df.sort_values(['a', 'b'], ascending=[True, False])
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Making heatmap from pandas DataFrame
... columns=columns)
plt.pcolor(df)
plt.yticks(np.arange(0.5, len(df.index), 1), df.index)
plt.xticks(np.arange(0.5, len(df.columns), 1), df.columns)
plt.show()
This gives:
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Check if an element is present in an array [duplicate]
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ECMAScript 2016 incorporates an includes() method for arrays that specifically solves the pro...
Sort array of objects by single key with date value
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How to install Android SDK Build Tools on the command line?
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Keep only first n characters in a string?
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edited Apr 12 '14 at 11:37
andrewb
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