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Replacing column values in a pandas DataFrame

I’m trying to replace the values in one column of a dataframe. The column (‘female’) only contains the values ‘female’ and ‘male’. I ...

June 1, 2022
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Programming, Python

IT Nursery

add a string prefix to each value in a string column using Pandas

I would like to append a string to the start of each value in a said column of a pandas dataframe (elegantly). I ...

May 31, 2022
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Programming, Python

IT Nursery

check if variable is dataframe

when my function f is called with a variable I want to check if var is a pandas dataframe: def f(var): if var ...

May 31, 2022
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Programming, Python

IT Nursery

How to test if a string contains one of the substrings in a list, in pandas?

Is there any function that would be the equivalent of a combination of df.isin() and df...

May 31, 2022
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Programming, Python

IT Nursery

What are the differences between Pandas and NumPy+SciPy in Python? [closed]

Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be ...

May 31, 2022
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Programming, Python

IT Nursery

Counting unique values in a column in pandas dataframe like in Qlik?

If I have a table like this: df = pd.DataFrame({ 'hID': [101, 102, 103, 101, 102, 104, 105, 101], 'dID':...

May 31, 2022
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Programming, Python

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A column-vector y was passed when a 1d array was expected

I need to fit RandomForestRegressor from sklearn.ensemble. forest = ensemble.RandomForestRegressor(**RF_tuned_parameters) model = forest.fit(train_fold, train_y) yhat = model.predict(test_fold) This code always worked until I ...

May 31, 2022
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Programming, Python

IT Nursery

NumPy or Pandas: Keeping array type as integer while having a NaN value

Is there a preferred way to keep the data type of a numpy array fixed as int (or int64 or whatever), while still ...

May 30, 2022
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Programming, Python

IT Nursery

How can I plot separate Pandas DataFrames as subplots?

I have a few Pandas DataFrames sharing the same value scale, but having different columns and indices. When invoking df.plot(), I get separate ...

May 30, 2022
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Programming, Python

IT Nursery

How to print a groupby object

I want to print the result of grouping with Pandas. I have a dataframe: import pandas as pd df = pd.DataFrame({'A':...

May 30, 2022
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