pandas dataframe convert column type to string or categorical
You need astype: For converting to categorical: Another solution is Categorical: Sample with data:
pandas
Dropping Multiple Columns from a data frame using Python
To delete multiple columns at the same time in pandas, you could specify the column names as shown below. The option inplace=True is needed if one wants the change affected column in the same dataframe. Otherwise remove it. Source: Python Pandas – Deleting multiple series from a data frame in one command
Python Package bt: Bool index error
Which gives the error: AttributeError: ‘numpy.bool_’ object has no attribute ‘index’ Which looks like it is relating to the following line: Now I’m just wondering how this is meant to work, as the whole purpose of creating this list is to have a True/False indicator iterated across a data set depending on the rule of … Read more
How can I one hot encode in Python?
I have a machine learning classification problem with 80% categorical variables. Must I use one hot encoding if I want to use some classifier for the classification? Can i pass the data to a classifier without the encoding? I am trying to do the following for feature selection: I read the train file:num_rows_to_read = 10000 … Read more