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pandas

How to deal with SettingWithCopyWarning in Pandas

The warning offers a suggestion to rewrite as follows: However, this doesn’t fit your usage, which is equivalent to: While it’s clear that you don’t care about writes making it back to the original frame (since you are overwriting the reference to it), unfortunately this pattern cannot be differentiated from the first chained assignment example. … Read more

Categories Python Tags chained-assignment, dataframe, pandas, python

“Series objects are mutable and cannot be hashed” error

I am trying to get the following script to work. The input file consists of 3 columns: gene association type, gene name, and disease name. I keep getting an error that says: Series objects are mutable and cannot be hashed Any help would be dearly appreciated!

Categories Python Tags pandas, python, typeerror

How to fix IndexError: invalid index to scalar variable

You are trying to index into a scalar (non-iterable) value: When you call [y for y in test] you are iterating over the values already, so you get a single value in y. Your code is the same as trying to do the following: I’m not sure what you’re trying to get into your results … Read more

Categories Python Tags numpy, pandas, python

How to groupby based on two columns in pandas?

A similar question might have been asked before, but I couldn’t find the exact one fitting to my problem. I want to group by a dataframe based on two columns. For exmaple to make this Into this: Meaning that summation on “quantity” column for same “id” and same “product”.

Categories Python Tags dataframe, group-by, pandas, pandas-groupby, python

ValueError: Unknown label type: ‘continuous’

I’ve seen other posts talking about this but anyone of these can help me. I am using jupyter notebook with Python 3.6.0 on windows x6 machine. I have a large dataset but I keep only a piece of it to run my models: This is a piece of code that i used: When I run … Read more

Categories Python Tags numpy, pandas, python, scikit-learn, valueerror

Convenient way to deal with ValueError: cannot reindex from a duplicate axis

Operations between series require non-duplicated indices, otherwise Pandas doesn’t know how to align values in calculations. This isn’t the case with your data currently. If you are certain that your series are aligned by position, you can call reset_index on each dataframe:

Categories Python Tags concat, datetime, indexing, pandas, python

How to show all columns’ names on a large pandas dataframe?

You can globally set printing options. I think this should work: Method 1: Method 2: This will allow you to see all column names & rows when you are doing .head(). None of the column name will be truncated. If you just want to see the column names you can do:

Categories Python Tags dataframe, options, pandas, python

How can I use the apply() function for a single column?

Given a sample dataframe df as: what you want is: that returns:

Categories Python Tags dataframe, pandas, python

Pandas DataFrame Groupby two columns and get counts

Categories Python Tags dataframe, pandas, python

What does `ValueError: cannot reindex from a duplicate axis` mean?

This error usually rises when you join / assign to a column when the index has duplicate values. Since you are assigning to a row, I suspect that there is a duplicate value in affinity_matrix.columns, perhaps not shown in your question.

Categories Python Tags pandas, python
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